初學者計算器

林做一個計算器，但我不能看到想通把我的txtDisplay什麼，展示什麼毛病我getOperator順便說一句我第一次發佈初學者計算器

public class Calculater1 extends javax.swing.JFrame { 
/** 
* Creates new form Calculater 
*/ 
private double total1 = 0.0; 
private double total2 = 0.0; 
private char math_operator; 

public Calculater1() { 
    initComponents(); 
} 

/** 
* This method is called from within the constructor to initialize the form. 
* WARNING: Do NOT modify this code. The content of this method is always 
* regenerated by the Form Editor. 
*/ 
@SuppressWarnings("unchecked") 
// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents 
private void initComponents() { 

    txtDisplay = new javax.swing.JTextField(); 
    jPanel1 = new javax.swing.JPanel(); 
    BtnOne = new javax.swing.JButton(); 
    BtnTwo = new javax.swing.JButton(); 
    BtnThree = new javax.swing.JButton(); 
    BtnFour = new javax.swing.JButton(); 
    BtnFive = new javax.swing.JButton(); 
    BtnSix = new javax.swing.JButton(); 
    BtnSeven = new javax.swing.JButton(); 
    BtnEight = new javax.swing.JButton(); 
    BtnNine = new javax.swing.JButton(); 
    BtnZero = new javax.swing.JButton(); 
    jPanel2 = new javax.swing.JPanel(); 
    BtnAdd = new javax.swing.JButton(); 
    BtnSubtract = new javax.swing.JButton(); 
    BtnMutiply = new javax.swing.JButton(); 
    BtnDivide = new javax.swing.JButton(); 
    BtnClear = new javax.swing.JButton(); 
    BtnEqual = new javax.swing.JButton(); 

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 
    setTitle("Calculator"); 

    txtDisplay.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      txtDisplayActionPerformed(evt); 
     } 
    }); 

    BtnOne.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N 
    BtnOne.setText("1"); 
    BtnOne.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnOneActionPerformed(evt); 
     } 
    }); 

    BtnTwo.setText("2"); 
    BtnTwo.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnTwoActionPerformed(evt); 
     } 
    }); 

    BtnThree.setText("3"); 
    BtnThree.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnThreeActionPerformed(evt); 
     } 
    }); 

    BtnFour.setText("4"); 
    BtnFour.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnFourActionPerformed(evt); 
     } 
    }); 

    BtnFive.setText("5"); 
    BtnFive.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnFiveActionPerformed(evt); 
     } 
    }); 

    BtnSix.setText("6"); 
    BtnSix.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnSixActionPerformed(evt); 
     } 
    }); 

    BtnSeven.setText("7"); 
    BtnSeven.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnSevenActionPerformed(evt); 
     } 
    }); 

    BtnEight.setText("8"); 
    BtnEight.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnEightActionPerformed(evt); 
     } 
    }); 

    BtnNine.setText("9"); 
    BtnNine.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnNineActionPerformed(evt); 
     } 
    }); 

    BtnZero.setText("0"); 
    BtnZero.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnZeroActionPerformed(evt); 
     } 
    }); 

    BtnAdd.setText("+"); 
    BtnAdd.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnAddActionPerformed(evt); 
     } 
    }); 

    BtnSubtract.setText("-"); 
    BtnSubtract.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnSubtractActionPerformed(evt); 
     } 
    }); 

    BtnMutiply.setText("*"); 
    BtnMutiply.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnMutiplyActionPerformed(evt); 
     } 
    }); 

    BtnDivide.setText("/"); 
    BtnDivide.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnDivideActionPerformed(evt); 
     } 
    }); 

    BtnClear.setText("C"); 
    BtnClear.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnClearActionPerformed(evt); 
     } 
    }); 

    BtnEqual.setText("="); 
    BtnEqual.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnEqualActionPerformed(evt); 
     } 
    }); 

    javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2); 
    jPanel2.setLayout(jPanel2Layout); 
    jPanel2Layout.setHorizontalGroup(
     jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(jPanel2Layout.createSequentialGroup() 
      .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addComponent(BtnAdd) 
       .addComponent(BtnSubtract) 
       .addComponent(BtnMutiply) 
       .addComponent(BtnDivide) 
       .addComponent(BtnClear) 
       .addComponent(BtnEqual)) 
      .addGap(0, 27, Short.MAX_VALUE)) 
    ); 
    jPanel2Layout.setVerticalGroup(
     jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(jPanel2Layout.createSequentialGroup() 
      .addGap(29, 29, 29) 
      .addComponent(BtnAdd) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
      .addComponent(BtnSubtract) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
      .addComponent(BtnMutiply) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
      .addComponent(BtnDivide) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
      .addComponent(BtnClear) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
      .addComponent(BtnEqual) 
      .addContainerGap(14, Short.MAX_VALUE)) 
    ); 

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); 
    jPanel1.setLayout(jPanel1Layout); 
    jPanel1Layout.setHorizontalGroup(
     jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(jPanel1Layout.createSequentialGroup() 
      .addContainerGap() 
      .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(jPanel1Layout.createSequentialGroup() 
        .addComponent(BtnThree, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
         .addComponent(BtnZero, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addGroup(jPanel1Layout.createSequentialGroup() 
          .addComponent(BtnSix, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE) 
          .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
          .addComponent(BtnNine, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)))) 
       .addGroup(jPanel1Layout.createSequentialGroup() 
        .addComponent(BtnOne, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
        .addComponent(BtnFour, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
        .addComponent(BtnSeven, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)) 
       .addGroup(jPanel1Layout.createSequentialGroup() 
        .addComponent(BtnTwo, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
        .addComponent(BtnFive, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
        .addComponent(BtnEight, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
      .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
    ); 
    jPanel1Layout.setVerticalGroup(
     jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(jPanel1Layout.createSequentialGroup() 
      .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(jPanel1Layout.createSequentialGroup() 
        .addGap(38, 38, 38) 
        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
         .addComponent(BtnSeven, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addComponent(BtnFour, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addComponent(BtnOne, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)) 
        .addGap(9, 9, 9) 
        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
         .addComponent(BtnFive, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addComponent(BtnEight, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addComponent(BtnTwo, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
         .addComponent(BtnSix, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addComponent(BtnNine, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addComponent(BtnThree, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
        .addComponent(BtnZero, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addGap(0, 0, Short.MAX_VALUE)) 
       .addGroup(jPanel1Layout.createSequentialGroup() 
        .addContainerGap() 
        .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))) 
      .addContainerGap()) 
    ); 

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
    getContentPane().setLayout(layout); 
    layout.setHorizontalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(layout.createSequentialGroup() 
      .addGap(127, 127, 127) 
      .addComponent(txtDisplay, javax.swing.GroupLayout.PREFERRED_SIZE, 150, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
     .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() 
      .addContainerGap(143, Short.MAX_VALUE) 
      .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addGap(19, 19, 19)) 
    ); 
    layout.setVerticalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(layout.createSequentialGroup() 
      .addGap(24, 24, 24) 
      .addComponent(txtDisplay, javax.swing.GroupLayout.PREFERRED_SIZE, 36, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addGap(18, 18, 18) 
      .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addContainerGap()) 
    ); 

    pack(); 
}// </editor-fold>//GEN-END:initComponents 

private void txtDisplayActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_txtDisplayActionPerformed 

}//GEN-LAST:event_txtDisplayActionPerformed 

private void BtnNineActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnNineActionPerformed 
    String BtnNineText = txtDisplay.getText() + BtnNine.getText(); 
    txtDisplay.setText(BtnNineText); 
}//GEN-LAST:event_BtnNineActionPerformed 

private void BtnEightActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnEightActionPerformed 
    String BtnEightText = txtDisplay.getText() + BtnEight.getText(); 
    txtDisplay.setText(BtnEightText); 
}//GEN-LAST:event_BtnEightActionPerformed 

private void BtnOneActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnOneActionPerformed 
    String BtnOneText = txtDisplay.getText() + BtnOne.getText(); 
    txtDisplay.setText(BtnOneText); 
}//GEN-LAST:event_BtnOneActionPerformed 

private void BtnTwoActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnTwoActionPerformed 
    String BtnTwoText = txtDisplay.getText() + BtnTwo.getText(); 
    txtDisplay.setText(BtnTwoText); 
}//GEN-LAST:event_BtnTwoActionPerformed 

private void BtnThreeActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnThreeActionPerformed 
    String BtnThreeText = txtDisplay.getText() + BtnThree.getText(); 
    txtDisplay.setText(BtnThreeText); 
}//GEN-LAST:event_BtnThreeActionPerformed 

private void BtnFourActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnFourActionPerformed 
    String BtnFourText = txtDisplay.getText() + BtnFour.getText(); 
    txtDisplay.setText(BtnFourText); 
}//GEN-LAST:event_BtnFourActionPerformed 

private void BtnFiveActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnFiveActionPerformed 
    String BtnFiveText = txtDisplay.getText() + BtnFive.getText(); 
    txtDisplay.setText(BtnFiveText); 
}//GEN-LAST:event_BtnFiveActionPerformed 

private void BtnSixActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnSixActionPerformed 
    String BtnSixText = txtDisplay.getText() + BtnSix.getText(); 
    txtDisplay.setText(BtnSixText); 
}//GEN-LAST:event_BtnSixActionPerformed 

private void BtnSevenActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnSevenActionPerformed 
    String BtnSevenText = txtDisplay.getText() + BtnSeven.getText(); 
    txtDisplay.setText(BtnSevenText); 
}//GEN-LAST:event_BtnSevenActionPerformed 

private void BtnZeroActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnZeroActionPerformed 
    String BtnZeroText = txtDisplay.getText() + BtnZero.getText(); 
    txtDisplay.setText(BtnZeroText); 
}//GEN-LAST:event_BtnZeroActionPerformed 

private void BtnAddActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnAddActionPerformed 

    String button_text = BtnAdd.getText(); 
    getOperator(button_text); 
}//GEN-LAST:event_BtnAddActionPerformed 

private void BtnEqualActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnEqualActionPerformed 
    switch (math_operator) { 
    case '+': 
    total2 = total1 + Double.parseDouble(txtDisplay.getText()); 
    break; 
    case '-': 
    total2 = total1 + Double.parseDouble(txtDisplay.getText()); 
    break; 
    case '/': 
    total2 = total1 + Double.parseDouble(txtDisplay.getText()); 
    break; 

    case '*': 
    total2 = total1 + Double.parseDouble(txtDisplay.getText()); 
    break; 
    } 
    txtDisplay.setText(Double.toString(total2)); 
    total1 = 0; 
}//GEN-LAST:event_BtnEqualActionPerformed 

private void BtnClearActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnClearActionPerformed 
    total2 = 0; 
    txtDisplay.setText(""); 
}//GEN-LAST:event_BtnClearActionPerformed 

private void BtnSubtractActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnSubtractActionPerformed 
    String button_text = BtnSubtract.getText(); 
    getOperator(button_text); 
}//GEN-LAST:event_BtnSubtractActionPerformed 

private void BtnDivideActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnDivideActionPerformed 
    String button_text = BtnDivide.getText(); 
    getOperator(button_text); 
}//GEN-LAST:event_BtnDivideActionPerformed 

private void BtnMutiplyActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnMutiplyActionPerformed 
    String button_text = BtnMutiply.getText(); 
    getOperator(button_text); 
}//GEN-LAST:event_BtnMutiplyActionPerformed 

/** 
* @param args the command line arguments 
*/ 
public static void main(String args[]) { 
    /* Set the Nimbus look and feel */ 
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> 
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. 
    * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
    */ 
    try { 
     for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { 
      if ("Nimbus".equals(info.getName())) { 
       javax.swing.UIManager.setLookAndFeel(info.getClassName()); 
       break; 
      } 
     } 
    } catch (ClassNotFoundException ex) { 
     java.util.logging.Logger.getLogger(Calculater.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (InstantiationException ex) { 
     java.util.logging.Logger.getLogger(Calculater.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (IllegalAccessException ex) { 
     java.util.logging.Logger.getLogger(Calculater.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
     java.util.logging.Logger.getLogger(Calculater.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } 
    //</editor-fold> 

    /* Create and display the form */ 
    java.awt.EventQueue.invokeLater(new Runnable() { 
     public void run() { 
      new Calculater().setVisible(true); 
     } 
    }); 
} 
// Variables declaration - do not modify//GEN-BEGIN:variables 
private javax.swing.JButton BtnAdd; 
private javax.swing.JButton BtnClear; 
private javax.swing.JButton BtnDivide; 
private javax.swing.JButton BtnEight; 
private javax.swing.JButton BtnEqual; 
private javax.swing.JButton BtnFive; 
private javax.swing.JButton BtnFour; 
private javax.swing.JButton BtnMutiply; 
private javax.swing.JButton BtnNine; 
private javax.swing.JButton BtnOne; 
private javax.swing.JButton BtnSeven; 
private javax.swing.JButton BtnSix; 
private javax.swing.JButton BtnSubtract; 
private javax.swing.JButton BtnThree; 
private javax.swing.JButton BtnTwo; 
private javax.swing.JButton BtnZero; 
private javax.swing.JPanel jPanel1; 
private javax.swing.JPanel jPanel2; 
private javax.swing.JTextField txtDisplay; 
// End of variables declaration//GEN-END:variables

}

來源

2012-11-26 user1853282

歡迎堆棧溢出。請張貼較少的代碼並提出具體問題。 – NPE

大部分代碼對這個問題都沒有用處。把它修剪成只對問題有用的東西。 – ApplePie

你有沒有聽說過[SSCCE]（http://sscce.org）？ – Lion

我要幫助你。只有時間我會用這麼多的代碼作爲例子。我所做的是使用JavaScript引擎來評估表達式。現在你不需要分開持有經營者和經營者。此外，您不再需要攜帶total1或total2變量。顯示包含整個表達式。

import javax.script.ScriptEngineManager; 
import javax.script.ScriptEngine; 

public class Calculator extends javax.swing.JFrame { 
/** 
* Creates new form Calculator 
*/ 

public Calculator() { 
    initComponents(); 
} 

/** 
* This method is called from within the constructor to initialize the form. 
* WARNING: Do NOT modify this code. The content of this method is always 
* regenerated by the Form Editor. 
*/ 
@SuppressWarnings("unchecked") 
// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents 
private void initComponents() { 

    txtDisplay = new javax.swing.JTextField(); 
    jPanel1 = new javax.swing.JPanel(); 
    BtnOne = new javax.swing.JButton(); 
    BtnTwo = new javax.swing.JButton(); 
    BtnThree = new javax.swing.JButton(); 
    BtnFour = new javax.swing.JButton(); 
    BtnFive = new javax.swing.JButton(); 
    BtnSix = new javax.swing.JButton(); 
    BtnSeven = new javax.swing.JButton(); 
    BtnEight = new javax.swing.JButton(); 
    BtnNine = new javax.swing.JButton(); 
    BtnZero = new javax.swing.JButton(); 
    jPanel2 = new javax.swing.JPanel(); 
    BtnAdd = new javax.swing.JButton(); 
    BtnSubtract = new javax.swing.JButton(); 
    BtnMutiply = new javax.swing.JButton(); 
    BtnDivide = new javax.swing.JButton(); 
    BtnClear = new javax.swing.JButton(); 
    BtnEqual = new javax.swing.JButton(); 

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 
    setTitle("Calculator"); 

    txtDisplay.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      txtDisplayActionPerformed(evt); 
     } 
    }); 

    BtnOne.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N 
    BtnOne.setText("1"); 
    BtnOne.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnOneActionPerformed(evt); 
     } 
    }); 

    BtnTwo.setText("2"); 
    BtnTwo.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnTwoActionPerformed(evt); 
     } 
    }); 

    BtnThree.setText("3"); 
    BtnThree.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnThreeActionPerformed(evt); 
     } 
    }); 

    BtnFour.setText("4"); 
    BtnFour.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnFourActionPerformed(evt); 
     } 
    }); 

    BtnFive.setText("5"); 
    BtnFive.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnFiveActionPerformed(evt); 
     } 
    }); 

    BtnSix.setText("6"); 
    BtnSix.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnSixActionPerformed(evt); 
     } 
    }); 

    BtnSeven.setText("7"); 
    BtnSeven.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnSevenActionPerformed(evt); 
     } 
    }); 

    BtnEight.setText("8"); 
    BtnEight.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnEightActionPerformed(evt); 
     } 
    }); 

    BtnNine.setText("9"); 
    BtnNine.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnNineActionPerformed(evt); 
     } 
    }); 

    BtnZero.setText("0"); 
    BtnZero.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnZeroActionPerformed(evt); 
     } 
    }); 

    BtnAdd.setText("+"); 
    BtnAdd.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnAddActionPerformed(evt); 
     } 
    }); 

    BtnSubtract.setText("-"); 
    BtnSubtract.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnSubtractActionPerformed(evt); 
     } 
    }); 

    BtnMutiply.setText("*"); 
    BtnMutiply.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnMutiplyActionPerformed(evt); 
     } 
    }); 

    BtnDivide.setText("/"); 
    BtnDivide.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnDivideActionPerformed(evt); 
     } 
    }); 

    BtnClear.setText("C"); 
    BtnClear.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnClearActionPerformed(evt); 
     } 
    }); 

    BtnEqual.setText("="); 
    BtnEqual.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      BtnEqualActionPerformed(evt); 
     } 
    }); 

    javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2); 
    jPanel2.setLayout(jPanel2Layout); 
    jPanel2Layout.setHorizontalGroup(
     jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(jPanel2Layout.createSequentialGroup() 
      .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addComponent(BtnAdd) 
       .addComponent(BtnSubtract) 
       .addComponent(BtnMutiply) 
       .addComponent(BtnDivide) 
       .addComponent(BtnClear) 
       .addComponent(BtnEqual)) 
      .addGap(0, 27, Short.MAX_VALUE)) 
    ); 
    jPanel2Layout.setVerticalGroup(
     jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(jPanel2Layout.createSequentialGroup() 
      .addGap(29, 29, 29) 
      .addComponent(BtnAdd) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
      .addComponent(BtnSubtract) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
      .addComponent(BtnMutiply) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
      .addComponent(BtnDivide) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
      .addComponent(BtnClear) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
      .addComponent(BtnEqual) 
      .addContainerGap(14, Short.MAX_VALUE)) 
    ); 

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); 
    jPanel1.setLayout(jPanel1Layout); 
    jPanel1Layout.setHorizontalGroup(
     jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(jPanel1Layout.createSequentialGroup() 
      .addContainerGap() 
      .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(jPanel1Layout.createSequentialGroup() 
        .addComponent(BtnThree, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
         .addComponent(BtnZero, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addGroup(jPanel1Layout.createSequentialGroup() 
          .addComponent(BtnSix, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE) 
          .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
          .addComponent(BtnNine, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)))) 
       .addGroup(jPanel1Layout.createSequentialGroup() 
        .addComponent(BtnOne, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
        .addComponent(BtnFour, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
        .addComponent(BtnSeven, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)) 
       .addGroup(jPanel1Layout.createSequentialGroup() 
        .addComponent(BtnTwo, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
        .addComponent(BtnFive, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
        .addComponent(BtnEight, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
      .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
    ); 
    jPanel1Layout.setVerticalGroup(
     jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(jPanel1Layout.createSequentialGroup() 
      .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(jPanel1Layout.createSequentialGroup() 
        .addGap(38, 38, 38) 
        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
         .addComponent(BtnSeven, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addComponent(BtnFour, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addComponent(BtnOne, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)) 
        .addGap(9, 9, 9) 
        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
         .addComponent(BtnFive, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addComponent(BtnEight, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addComponent(BtnTwo, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
         .addComponent(BtnSix, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addComponent(BtnNine, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addComponent(BtnThree, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
        .addComponent(BtnZero, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addGap(0, 0, Short.MAX_VALUE)) 
       .addGroup(jPanel1Layout.createSequentialGroup() 
        .addContainerGap() 
        .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))) 
      .addContainerGap()) 
    ); 

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
    getContentPane().setLayout(layout); 
    layout.setHorizontalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(layout.createSequentialGroup() 
      .addGap(127, 127, 127) 
      .addComponent(txtDisplay, javax.swing.GroupLayout.PREFERRED_SIZE, 150, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
     .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() 
      .addContainerGap(143, Short.MAX_VALUE) 
      .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addGap(19, 19, 19)) 
    ); 
    layout.setVerticalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(layout.createSequentialGroup() 
      .addGap(24, 24, 24) 
      .addComponent(txtDisplay, javax.swing.GroupLayout.PREFERRED_SIZE, 36, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addGap(18, 18, 18) 
      .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addContainerGap()) 
    ); 

    pack(); 
}// </editor-fold>//GEN-END:initComponents 

private void txtDisplayActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_txtDisplayActionPerformed 

}//GEN-LAST:event_txtDisplayActionPerformed 

private void BtnNineActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnNineActionPerformed 
    String BtnNineText = txtDisplay.getText() + BtnNine.getText(); 
    txtDisplay.setText(BtnNineText); 
}//GEN-LAST:event_BtnNineActionPerformed 

private void BtnEightActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnEightActionPerformed 
    String BtnEightText = txtDisplay.getText() + BtnEight.getText(); 
    txtDisplay.setText(BtnEightText); 
}//GEN-LAST:event_BtnEightActionPerformed 

private void BtnOneActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnOneActionPerformed 
    String BtnOneText = txtDisplay.getText() + BtnOne.getText(); 
    txtDisplay.setText(BtnOneText); 
}//GEN-LAST:event_BtnOneActionPerformed 

private void BtnTwoActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnTwoActionPerformed 
    String BtnTwoText = txtDisplay.getText() + BtnTwo.getText(); 
    txtDisplay.setText(BtnTwoText); 
}//GEN-LAST:event_BtnTwoActionPerformed 

private void BtnThreeActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnThreeActionPerformed 
    String BtnThreeText = txtDisplay.getText() + BtnThree.getText(); 
    txtDisplay.setText(BtnThreeText); 
}//GEN-LAST:event_BtnThreeActionPerformed 

private void BtnFourActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnFourActionPerformed 
    String BtnFourText = txtDisplay.getText() + BtnFour.getText(); 
    txtDisplay.setText(BtnFourText); 
}//GEN-LAST:event_BtnFourActionPerformed 

private void BtnFiveActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnFiveActionPerformed 
    String BtnFiveText = txtDisplay.getText() + BtnFive.getText(); 
    txtDisplay.setText(BtnFiveText); 
}//GEN-LAST:event_BtnFiveActionPerformed 

private void BtnSixActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnSixActionPerformed 
    String BtnSixText = txtDisplay.getText() + BtnSix.getText(); 
    txtDisplay.setText(BtnSixText); 
}//GEN-LAST:event_BtnSixActionPerformed 

private void BtnSevenActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnSevenActionPerformed 
    String BtnSevenText = txtDisplay.getText() + BtnSeven.getText(); 
    txtDisplay.setText(BtnSevenText); 
}//GEN-LAST:event_BtnSevenActionPerformed 

private void BtnZeroActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnZeroActionPerformed 
    String BtnZeroText = txtDisplay.getText() + BtnZero.getText(); 
    txtDisplay.setText(BtnZeroText); 
}//GEN-LAST:event_BtnZeroActionPerformed 

private void BtnAddActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnAddActionPerformed 

    String button_text = BtnAdd.getText(); 
    getOperator(button_text); 
}//GEN-LAST:event_BtnAddActionPerformed 

private void getOperator(String str) 
{ 
    txtDisplay.setText(txtDisplay.getText() + str); 
} 

private void BtnEqualActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnEqualActionPerformed 

    ScriptEngineManager mgr = new ScriptEngineManager(); 
    ScriptEngine engine = mgr.getEngineByName("JavaScript"); 

    try 
    { 
    txtDisplay.setText((engine.eval(txtDisplay.getText())).toString()); 
    } 
    catch(javax.script.ScriptException se) 
    { 
    txtDisplay.setText("Error evaluating: " + txtDisplay.getText()); 
    } 
}//GEN-LAST:event_BtnEqualActionPerformed 

private void BtnClearActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnClearActionPerformed 
    txtDisplay.setText(""); 
}//GEN-LAST:event_BtnClearActionPerformed 

private void BtnSubtractActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnSubtractActionPerformed 
    String button_text = BtnSubtract.getText(); 
    getOperator(button_text); 
}//GEN-LAST:event_BtnSubtractActionPerformed 

private void BtnDivideActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnDivideActionPerformed 
    String button_text = BtnDivide.getText(); 
    getOperator(button_text); 
}//GEN-LAST:event_BtnDivideActionPerformed 

private void BtnMutiplyActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_BtnMutiplyActionPerformed 
    String button_text = BtnMutiply.getText(); 
    getOperator(button_text); 
}//GEN-LAST:event_BtnMutiplyActionPerformed 

/** 
* @param args the command line arguments 
*/ 
public static void main(String args[]) { 
    /* Set the Nimbus look and feel */ 
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> 
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. 
    * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
    */ 
    try { 
     for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { 
      if ("Nimbus".equals(info.getName())) { 
       javax.swing.UIManager.setLookAndFeel(info.getClassName()); 
       break; 
      } 
     } 
    } catch (ClassNotFoundException ex) { 
     java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (InstantiationException ex) { 
     java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (IllegalAccessException ex) { 
     java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
     java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } 
    //</editor-fold> 

    /* Create and display the form */ 
    java.awt.EventQueue.invokeLater(new Runnable() { 
     public void run() { 
      new Calculator().setVisible(true); 
     } 
    }); 
} 
// Variables declaration - do not modify//GEN-BEGIN:variables 
private javax.swing.JButton BtnAdd; 
private javax.swing.JButton BtnClear; 
private javax.swing.JButton BtnDivide; 
private javax.swing.JButton BtnEight; 
private javax.swing.JButton BtnEqual; 
private javax.swing.JButton BtnFive; 
private javax.swing.JButton BtnFour; 
private javax.swing.JButton BtnMutiply; 
private javax.swing.JButton BtnNine; 
private javax.swing.JButton BtnOne; 
private javax.swing.JButton BtnSeven; 
private javax.swing.JButton BtnSix; 
private javax.swing.JButton BtnSubtract; 
private javax.swing.JButton BtnThree; 
private javax.swing.JButton BtnTwo; 
private javax.swing.JButton BtnZero; 
private javax.swing.JPanel jPanel1; 
private javax.swing.JPanel jPanel2; 
private javax.swing.JTextField txtDisplay; 
// End of variables declaration//GEN-END:variables 
}

來源

2012-11-26 18:29:40

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
class Calculator implements ActionListener 
{ 
JFrame f; 
JTextField tf; 
JButton num[]; 
JButton btNum0; 
JButton btEqual; 
JButton btAdd; 
JButton btSubtract; 
JButton btMultiply; 
JButton btDivide; 
JButton btSolve; 
JButton btClear; 
JButton btDot; 
JButton btExponent; 
double TEMP; 
double SolveTEMP; 
String display=""; 
Boolean addBool = false ; 
Boolean subBool = false ; 
Boolean divBool = false ; 
Boolean mulBool = false ; 
Boolean expBool = false ;  
Calculator(String s) 
{ 
String number[]={"1","2","3","4","5","6","7","8","9"}; 
int m=0; 
int x[]={30,80,130}; 
int y[]={205,155,105}; 
f=new JFrame(s); 
    try { 
     UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
    } catch(Exception e) { 
     System.out.println("Error setting native LAF: " + e); 
    } 
JLabel l=new JLabel("Welcome To ZeeCalc Calculator.. :)"); 
l.setBounds(30,10,240,40); 
f.add(l); 
tf=new JTextField(); 
num=new JButton[number.length]; 
tf.setBounds(30,50,240,40); 
f.add(tf); 
tf.setEditable(false); 
for(int j=0;j<x.length;j++) 
{ 
for(int i=0;i<y.length;i++) 
{ 
if(m<num.length) 
{ 
num[m]=new JButton(String.valueOf(m+1)); 
num[m].setBounds(x[i],y[j],45,45); 
f.add(num[m]); 
} 
m++; 
} 
} 

btNum0=new JButton("0"); 
btNum0.setBounds(30,255,95,45); 
f.add(btNum0); 

btAdd=new JButton("+"); 
btAdd.setBounds(180,255,45,45); 
f.add(btAdd); 

btSubtract=new JButton("-"); 
btSubtract.setBounds(180,205,45,45); 
f.add(btSubtract); 

btMultiply=new JButton("*"); 
btMultiply.setBounds(180,155,45,45); 
f.add(btMultiply); 

btDot=new JButton("."); 
btDot.setBounds(230,155,45,45); 
f.add(btDot); 

btDivide=new JButton("/"); 
btDivide.setBounds(180,105,45,45); 
f.add(btDivide); 

btExponent=new JButton("^"); 
btExponent.setBounds(230,105,45,45); 
f.add(btExponent); 


btSolve=new JButton("="); 
btSolve.setBounds(230,205,45,95); 
f.add(btSolve); 


btClear=new JButton("C"); 
btClear.setBounds(130,255,45,45); 
f.add(btClear); 



m=0; 
for(int i=0;i<x.length;i++) 
{ 
for(int j=0;j<y.length;j++) 
{ 
if(m<num.length) 
{ 
num[m].addActionListener(this); 
} 
m++; 
} 
} 
btNum0.addActionListener(this); 
btAdd.addActionListener(this); 
btSubtract.addActionListener(this); 
btMultiply.addActionListener(this); 
btDivide.addActionListener(this); 
btSolve.addActionListener(new Operations()); 
btClear.addActionListener(this); 
btDot.addActionListener(this); 
btExponent.addActionListener(this); 
f.setLayout(null); 
f.setSize(310,360); 
f.setVisible(true); 
f.setResizable(false); 
f.addWindowListener(new WindowAdapter() 
        { 
        public void windowClosing(WindowEvent e) 
        { 
        System.exit(0); 
        } 
        }); 
} 




public void actionPerformed(ActionEvent e) 
{ 

if(e.getSource()==num[0]) 
{ 
    display = tf.getText(); 
    tf.setText(display + "1"); 
} 
else if(e.getSource()==num[1]) 
{ 
display = tf.getText(); 
    tf.setText(display + "2"); 
} 
else if(e.getSource()==num[2]) 
{ 
display = tf.getText(); 
    tf.setText(display + "3"); 
} 
else if(e.getSource()==num[3]) 
{ 
display = tf.getText(); 
    tf.setText(display + "4"); 
} 
else if(e.getSource()==num[4]) 
{ 
display = tf.getText(); 
    tf.setText(display + "5"); 
} 
else if(e.getSource()==num[5]) 
{ 
display = tf.getText(); 
    tf.setText(display + "6"); 
} 
else if(e.getSource()==num[6]) 
{ 
display = tf.getText(); 
    tf.setText(display + "7"); 
} 
else if(e.getSource()==num[7]) 
{ 
display = tf.getText(); 
    tf.setText(display + "8"); 
} 
else if(e.getSource()==num[8]) 
{ 
display = tf.getText(); 
    tf.setText(display + "9"); 
} 
else if(e.getSource()==btNum0) 
{ 
display = tf.getText(); 
    tf.setText(display + "0"); 
} 

else if(e.getSource()==btDot) 
{ 
String dot="."; 
display=tf.getText(); 
tf.setText(display+ "."); 
} 

else if(e.getSource()==btAdd) 
{ 
TEMP=Double.parseDouble(tf.getText()); 
tf.setText(""); 
addBool=true; 
} 
else if(e.getSource()==btSubtract) 
{ 
TEMP=Double.parseDouble(tf.getText()); 
tf.setText(""); 
subBool=true; 
} 
else if(e.getSource()==btMultiply) 
{ 
TEMP=Double.parseDouble(tf.getText()); 
tf.setText(""); 
mulBool=true; 
} 

else if(e.getSource()==btDivide) 
{ 
TEMP=Double.parseDouble(tf.getText()); 
tf.setText(""); 
divBool=true; 
} 
else if(e.getSource()==btExponent) 
{ 
TEMP=Double.parseDouble(tf.getText()); 
tf.setText(""); 
expBool=true; 
} 
else if(e.getSource()==btClear) 
{ 
tf.setText(null); 
} 

} 

public static void main(String... r) 
{ 
new Calculator("ZeeCalc Calculator"); 

} 


class Operations implements ActionListener 
{ 
public void actionPerformed(ActionEvent e) 
{ 
//double c=1; 
SolveTEMP=Double.parseDouble(tf.getText()); 

if(addBool==true) 
{ 
SolveTEMP=SolveTEMP+TEMP; 
} 

else if(subBool==true) 
{ 
SolveTEMP=TEMP-SolveTEMP; 
} 
else if(mulBool==true) 
{ 
SolveTEMP=SolveTEMP*TEMP; 
} 
else if(divBool==true) 
{ 
SolveTEMP=TEMP/SolveTEMP; 
} 
else if(expBool==true) 
{ 
double a=TEMP,b=SolveTEMP; 
SolveTEMP=1; 
for(int i=0;i<b;i++) 
{ 
SolveTEMP=SolveTEMP*TEMP; 
} 
} 
tf.setText(Double.toString(SolveTEMP)); 

addBool = false ; 
subBool = false ; 
mulBool = false ; 
divBool = false ; 
expBool = false ; 
} 

} 

}

來源

2014-05-12 17:00:03

全功能簡單的計算器.... –

初學者計算器

回答

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