如何獲取JTextField爲int並返回？

Question

嗨我正在爲我的java類的程序工作，並遇到一些問題。該任務是編輯Professor的現有代碼，以便在GUI中單擊按鈕時，它將採用當前JTextField的值並將其添加到下一個字段的值中，並將該值放入該字段中。我已經設法將他編輯爲具有正確的GUI佈局，並試圖讓計算方面的工作，但在思想的損失。我需要了解如何在啓動時立即在JTextFields中顯示值，以及如何添加內容。任何幫助是極大的讚賞！

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import java.awt.Graphics2D; 

public class U27 
{ 
    public static void main(String[] args) 
    { 
     MiscFocusFrame myframe = new MiscFocusFrame(); 
     myframe.setVisible(true); 
    } 
} 

class MiscFocusFrame extends JFrame 
{ 
    private JTextField myField; 
    private MiscFocusPanel myPanel; 
    private final int FRAMEW = 900; 
    private final int FRAMEH = 200; 

    public MiscFocusFrame() 
    { 
     setTitle("U27"); 
     setSize(FRAMEW, FRAMEH); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

     myPanel = new MiscFocusPanel(); 
     Container contentPane = getContentPane(); 
     contentPane.add(myPanel, "Center"); 
    } 
} 

class MiscFocusPanel extends JPanel 
{ 
    private MiscFocusRegister register1; 
    private MiscFocusRegister register2; 
    private MiscFocusRegister register3; 
    private MiscFocusRegister register4; 

    public MiscFocusPanel() 
    { 
     register1 = new MiscFocusRegister(4); 
     register2 = new MiscFocusRegister(4); 
     register3 = new MiscFocusRegister(4); 
     register4 = new MiscFocusRegister(4); 

     register1.setRegisterToPassFocusTo(register2); 
     register2.setRegisterToPassFocusTo(register3); 
     register3.setRegisterToPassFocusTo(register4); 
     register4.setRegisterToPassFocusTo(register1); 

     setLayout(new GridLayout(2, 6)); 

     JLabel labelA = new JLabel("Cup 1", JLabel.LEFT); 
     JPanel labelPanelA = new JPanel(); 
     labelPanelA.add(labelA); 
     add(labelPanelA); 

     JPanel regPanelA = new JPanel(); 
     regPanelA.add(register1.getMyField()); 
     add(regPanelA); 

     JButton myButton1 = new JButton("Add To Next Cup"); 
     MiscButtonListener myButtonListener1 = new MiscButtonListener(); 
     myButton1.addActionListener(myButtonListener1); 
     JPanel buttonPanel1 = new JPanel(); 
     buttonPanel1.add(myButton1); 
     add(buttonPanel1); 

     JLabel labelB = new JLabel("Cup 2", JLabel.LEFT); 
     JPanel labelPanelB = new JPanel(); 
     labelPanelB.add(labelB); 
     add(labelPanelB); 

     JPanel regPanelB = new JPanel(); 
     regPanelB.add(register2.getMyField()); 
     add(regPanelB); 

     JButton myButton2 = new JButton("Add To Next Cup"); 
     MiscButtonListener myButtonListener2 = new MiscButtonListener(); 
     myButton2.addActionListener(myButtonListener2); 
     JPanel buttonPanel2 = new JPanel(); 
     buttonPanel2.add(myButton2); 
     add(buttonPanel2); 

     JLabel labelC = new JLabel("Cup 3", JLabel.LEFT); 
     JPanel labelPanelC = new JPanel(); 
     labelPanelC.add(labelC); 
     add(labelPanelC); 

     JPanel regPanelC = new JPanel(); 
     regPanelC.add(register3.getMyField()); 
     add(regPanelC); 

     JButton myButton3 = new JButton("Add To Next Cup"); 
     MiscButtonListener myButtonListener3 = new MiscButtonListener(); 
     myButton3.addActionListener(myButtonListener3); 
     JPanel buttonPanel3 = new JPanel(); 
     buttonPanel3.add(myButton3); 
     add(buttonPanel3); 

     JLabel labelD = new JLabel("Cup 4", JLabel.LEFT); 
     JPanel labelPanelD = new JPanel(); 
     labelPanelD.add(labelD); 
     add(labelPanelD); 

     JPanel regPanelD = new JPanel(); 
     regPanelD.add(register4.getMyField()); 
     add(regPanelD); 

     JButton myButton4 = new JButton("Add To Next Cup"); 
     MiscButtonListener myButtonListener4 = new MiscButtonListener(); 
     myButton4.addActionListener(myButtonListener4); 
     JPanel buttonPanel4 = new JPanel(); 
     buttonPanel4.add(myButton4); 
     add(buttonPanel4); 

    } 

    public void paintComponent(Graphics g) 
    { 
     Graphics2D g2 = (Graphics2D) g; 
     super.paintComponent(g2); 
    } 

    private class MiscButtonListener implements ActionListener 
    { 
     public void actionPerformed(ActionEvent event) 
     { 
      register1.swapRegisterContents(register2); 
     } 
    } 
} 


/* 
This class contains a new method, setRegisterToPassFocusTo(), and in 
the listener focus is passed to that register after the new value for 
the text field is taken in. 
*/ 

class MiscFocusRegister 
{ 
    private MiscFocusByte registerValue; 
    private JTextField myField; 
    private MiscFocusRegister registerToPassFocusTo; 

    public MiscFocusRegister() 
    { 
    } 

    public MiscFocusRegister(int stringIn) 
    { 
     registerValue = new MiscFocusByte(stringIn); 
     myField = new JTextField(stringIn); 
     TextFieldListener myListener = new TextFieldListener(); 
     myField.addActionListener(myListener); 
    } 

    public void setRegisterValue(MiscFocusByte byteIn) 
    { 
     registerValue = byteIn; 
    } 

    public MiscFocusByte getRegisterValue() 
    { 
     return registerValue; 
    } 

    public void setMyField(JTextField fieldIn) 
    { 
     myField = fieldIn; 
    } 

    public JTextField getMyField() 
    { 
     return myField; 
    } 

    public void setRegisterToPassFocusTo(MiscFocusRegister registerIn) 
    { 
     registerToPassFocusTo = registerIn; 
    } 

    public void swapRegisterContents(MiscFocusRegister source) 
    { 
     MiscFocusByte tempValue; 

     tempValue = source.getRegisterValue(); 
     source.setRegisterValue(this.getRegisterValue()); 
     source.myField.setText(source.getRegisterValue().getStringFromByte()); 
     this.setRegisterValue(tempValue); 
     this.myField.setText(this.getRegisterValue().getStringFromByte()); 
    } 

    private class TextFieldListener implements ActionListener 
    { 
     public void actionPerformed(ActionEvent event) 
     { 
      String inputString = myField.getText(); 
      registerValue.setByteToThisString(inputString); 
      registerToPassFocusTo.getMyField().requestFocusInWindow(); 
     } 
    } 
} 

class MiscFocusByte 
{ 
    public static int bitsinbyte = 8; 
    private static final String junk = "00000000"; 
    private char bytearray[] = new char[bitsinbyte]; 
    public String astring; 

    public MiscFocusByte() 
    { 
     junk.getChars(0, bitsinbyte, bytearray, 0); 
    } 

    public MiscFocusByte(int stringIn) 
    { 
     //junk.getChars(0, bitsinbyte, bytearray, 0); 
     //int stringlength = stringIn.length(); 
     //if(stringlength > bitsinbyte) 
     // stringlength = bitsinbyte; 
     //stringIn.getChars(0, stringlength, bytearray, 0); 
     stringIn = stringIn + 4; 
    } 

    public void setByteToThisString(String astring) 
    { 
     //junk.getChars(0, bitsinbyte, bytearray, 0); 
     //int stringlength = astring.length(); 
     //if(stringlength > bitsinbyte) 
     // stringlength = bitsinbyte; 
     //astring.getChars(0, stringlength, bytearray, 0); 
     astring = astring + 4; 
    } 

    public String getStringFromByte() 
    { 
     //return String.copyValueOf(bytearray); 
     return String.valueOf(astring); 
    } 
} 

Answer 1

嘗試是這樣的..

String text=jTextField1.getText(); 
text+="1"; 
jTextField1.setText(text); 
jTextField1.requestFocus();