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我一直在試圖編寫一個程序，有兩個框架，第一個是NewJFrame，第二個是NewJFrame1，在NewJFrame中我把一個jComboBox（jComboBox1 ）和一個jTextField（jTextField1）和一個jButton（jButton1），在第二個我只把一個jTextField（jTextField2）， 我寫了一個代碼，應該（當jButton1被點擊）採取選擇的項目從jComboBox1中將其放入NewJFrame1中的jTextField 2中，現在如果在jComboBox1中選擇的項目是「None」，則打印到jTextField 2中的文本應該寫入NewJFrame中的jTextField 1中，此按鈕也應該關閉NewJFrame並打開NewJFrame1.Now，當我嘗試構建程序時，它返回了2個錯誤。這兩個錯誤是由NetBeans紅色列出的，當我看到它所提示的建議時：無法找到符號。 謝謝如果和其他方法jComboBox和2 jTextFields
public class NewJFrame extends javax.swing.JFrame {
private Object jTextField2;
/**
* Creates new form NewJFrame
*/
public NewJFrame() {
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">
private void initComponents() {
jButton1 = new javax.swing.JButton();
jComboBox1 = new javax.swing.JComboBox();
jTextField1 = new javax.swing.JTextField();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("jButton1");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
jComboBox1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jComboBox1ActionPerformed(evt);
}
});
jTextField1.setText("jTextField1");
jTextField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField1ActionPerformed(evt);
}
});
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(159, 159, 159)
.addComponent(jButton1)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addGap(54, 54, 54)
.addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 151, Short.MAX_VALUE)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(80, 80, 80))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(95, 95, 95)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 99, Short.MAX_VALUE)
.addComponent(jButton1)
.addGap(63, 63, 63))
);
pack();
}// </editor-fold>
private void jComboBox1ActionPerformed(java.awt.event.ActionEvent evt) {
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
NewJFrame1 a = new NewJFrame1();
this.setVisible(false);
a.setVisible(true);
String Str;
String Abc;
Str = jComboBox1.getSelectedItem().toString();
Abc = jTextField1.getText().toString();
if (jComboBox1.getSelectedItem().equals("None")){
jTextField2.setText(Abc);/*****here is the error,it's the setText*****/
}
else
{
jTextField2.setText(Str);/*****and here is the second error,it's the setText also*****/
}
}
private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
/**
* @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(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(NewJFrame.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 NewJFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JComboBox jComboBox1;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}
這是輸出：
ant -f "C:\\Users\\user\\Documents\\MYJAVAPROGRAMS\\if combobox trial" -Dnb.internal.action.name=rebuild clean jar
init:
deps-clean:
Updating property file: C:\Users\user\Documents\MYJAVAPROGRAMS\if combobox trial\build \built-clean.properties
Deleting directory C:\Users\user\Documents\MYJAVAPROGRAMS\if combobox trial\build
clean:
init:
deps-jar:
Created dir: C:\Users\user\Documents\MYJAVAPROGRAMS\if combobox trial\build
Updating property file: C:\Users\user\Documents\MYJAVAPROGRAMS\if combobox trial\build \built-jar.properties
Created dir: C:\Users\user\Documents\MYJAVAPROGRAMS\if combobox trial\build\classes
Created dir: C:\Users\user\Documents\MYJAVAPROGRAMS\if combobox trial\build\empty
Created dir: C:\Users\user\Documents\MYJAVAPROGRAMS\if combobox trial\build\generated- sources\ap-source-output
Compiling 3 source files to C:\Users\user\Documents\MYJAVAPROGRAMS\if combobox trial\build\classes
C:\Users\user\Documents\MYJAVAPROGRAMS\if combobox trial\src\NewJFrame.java:108: error: cannot find symbol
jTextField2.setText(Abc);
symbol: method setText(String)
location: variable jTextField2 of type Object
C:\Users\user\Documents\MYJAVAPROGRAMS\if combobox trial\src\NewJFrame.java:113: error: cannot find symbol
jTextField2.setText(Str);
symbol: method setText(String)
location: variable jTextField2 of type Object
2 errors
C:\Users\user\Documents\MYJAVAPROGRAMS\if combobox trial\nbproject\build-impl.xml:945: The following error occurred while executing this line:
C:\Users\user\Documents\MYJAVAPROGRAMS\if combobox trial\nbproject\build-impl.xml:285: Compile failed; see the compiler error output for details.
BUILD FAILED (total time: 0 seconds)
然後會發生什麼？你的投入是什麼，你的預期產出是什麼，你的實際產出是多少？ –
嗯，我已經將這段代碼分配給一個j Button，那個按鈕應該打開一個新的Frame並關閉前一個，並且應該將文本打印到我放入新框架的文本框中。 但是，當我嘗試構建該應用程序時，它返回2錯誤這兩個錯誤是由紅字排列netbeans這是setText（兩者）。 – Anthony
當我檢查它的建議時說：「找不到符號」 – Anthony