通过按下按钮更改Jtextfield（“手机界面”）

Question

我正在用Java中的构造函数生成“手机界面”。我希望能够通过按下手机的不同按钮来拨打号码。生成接口工作，但拨号没有影响。我希望这里有人能帮我解决我的问题。谢谢

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

    public class Handybastler extends JFrame implements ActionListener { 

    String Status = "Verbindung getrennt"; 
    String Wahl; 
    JFrame frame = new JFrame("handy"); 
    JTextField feld = new JTextField(21); 
    JButton button1 = new JButton("Wahl"); 
    JButton button2 = new JButton("Leer"); 
    JButton button3 = new JButton("Abbr."); 
    JButton button4 = new JButton("1"); 
    JButton button5 = new JButton("2"); 
    JButton button6 = new JButton("3"); 
    JButton button7 = new JButton("4"); 
    JButton button8 = new JButton("5"); 
    JButton button9 = new JButton("6"); 
    JButton button10 = new JButton("7"); 
    JButton button11 = new JButton("8"); 
    JButton button12 = new JButton("9"); 
    JButton button13 = new JButton("Leer"); 
    JButton button14 = new JButton("0"); 
    JButton button15 = new JButton("Leer"); 

    public Handybastler() { 
     JLabel label = new JLabel(Status); 
     frame.setSize(250, 350); 
     frame.setLocationRelativeTo(null); 
     frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); 
     frame.setLayout(new BorderLayout()); 
     JPanel panel = new JPanel(); 
     JPanel panel2 = new JPanel(); 
     panel2.setLayout(new GridLayout(5, 3, 5, 5)); 

     panel.add(feld); 
     panel2.add(button1); 
     panel2.add(button2); 
     panel2.add(button3); 
     panel2.add(button4); 
     panel2.add(button5); 
     panel2.add(button6); 
     panel2.add(button7); 
     panel2.add(button8); 
     panel2.add(button9); 
     panel2.add(button10); 
     panel2.add(button11); 
     panel2.add(button12); 
     panel2.add(button13); 
     panel2.add(button14); 
     panel2.add(button15); 

     button15.setVisible(false); 
     button13.setVisible(false); 
     button2.setVisible(false); 
     frame.add(label, BorderLayout.SOUTH); 
     frame.add(panel, BorderLayout.NORTH); 
     frame.add(panel2); 
     frame.setVisible(true);  
    } 

    public void Listener() { 
     button1.addActionListener(this); 
     button3.addActionListener(this); 
     button4.addActionListener(this); 
     button5.addActionListener(this); 
     button6.addActionListener(this); 
     button7.addActionListener(this); 
     button8.addActionListener(this); 
     button9.addActionListener(this); 
     button10.addActionListener(this); 
     button11.addActionListener(this); 
     button12.addActionListener(this); 
     button14.addActionListener(this); 
    }  

    public void actionPerformed(ActionEvent ae) { 
     if (ae.getSource() == this.button4) { 
      char A = 1; 
      Wahl = Wahl + A; 
      waehle(Wahl); 
     } else if (ae.getSource() == this.button5) { 
      char A = 2; 
      Wahl = Wahl + A; 
      waehle(Wahl); 
     } else if (ae.getSource() == this.button6) { 
      char A = 3; 
      Wahl = Wahl + A; 
      waehle(Wahl); 
     } else if (ae.getSource() == this.button7) { 
      char A = 4; 
      Wahl = Wahl + A; 
      waehle(Wahl); 
     } else if (ae.getSource() == this.button8) { 
      char A = 5; 
      Wahl = Wahl + A; 
      waehle(Wahl); 
     } else if (ae.getSource() == this.button9) { 
      char A = 6; 
      Wahl = Wahl + A; 
      waehle(Wahl); 
     } else if (ae.getSource() == this.button10) { 
      char A = 7; 
      Wahl = Wahl + A; 
      waehle(Wahl); 
     } else if (ae.getSource() == this.button11) { 
      char A = 8; 
      Wahl = Wahl + A; 
      waehle(Wahl); 
     } else if (ae.getSource() == this.button12) { 
      char A = 9; 
      Wahl = Wahl + A; 
      waehle(Wahl); 
     } else if (ae.getSource() == this.button14) { 
      char A = 0; 
      Wahl = Wahl + A; 
      waehle(Wahl); 
     }   
    } 

    public void waehle(String Wahl) { 
     feld.setText(Wahl); 
    } 
} 

Answer 1

1. 初始化的Wahl在开始：

   String  Wahl = ""; 
   

2. Char 5不等于String “5”。字符5是字符的代码5。使用String A = "1";代替char A = 1;

3. 在您的构造函数中调用Listener()。

全部工作来源：

package test; 

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

public class Handybastler extends JFrame implements ActionListener { 

String  Status = "Verbindung getrennt"; 
String  Wahl = ""; 
JFrame  frame = new JFrame("handy"); 
JTextField feld  = new JTextField(21); 

JButton button1 = new JButton("Wahl"); 
JButton button2 = new JButton("Leer"); 
JButton button3 = new JButton("Abbr."); 
JButton button4 = new JButton("1"); 
JButton button5 = new JButton("2"); 
JButton button6 = new JButton("3"); 
JButton button7 = new JButton("4"); 
JButton button8 = new JButton("5"); 
JButton button9 = new JButton("6"); 
JButton button10 = new JButton("7"); 
JButton button11 = new JButton("8"); 
JButton button12 = new JButton("9"); 
JButton button13 = new JButton("Leer"); 
JButton button14 = new JButton("0"); 
JButton button15 = new JButton("Leer"); 

public Handybastler() { 
    JLabel label = new JLabel(Status); 
    frame.setSize(250, 350); 
    frame.setLocationRelativeTo(null); 
    frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); 
    frame.setLayout(new BorderLayout()); 
    JPanel panel = new JPanel(); 
    JPanel panel2 = new JPanel(); 
    panel2.setLayout(new GridLayout(5, 3, 5, 5)); 

    panel.add(feld); 
    panel2.add(button1); 
    panel2.add(button2); 
    panel2.add(button3); 
    panel2.add(button4); 
    panel2.add(button5); 
    panel2.add(button6); 
    panel2.add(button7); 
    panel2.add(button8); 
    panel2.add(button9); 
    panel2.add(button10); 
    panel2.add(button11); 
    panel2.add(button12); 
    panel2.add(button13); 
    panel2.add(button14); 
    panel2.add(button15); 

    button15.setVisible(false); 
    button13.setVisible(false); 
    button2.setVisible(false); 
    frame.add(label, BorderLayout.SOUTH); 
    frame.add(panel, BorderLayout.NORTH); 
    frame.add(panel2); 
    frame.setVisible(true); 

    Listener(); 
} 

public void Listener() { 
    button1.addActionListener(this); 
    button3.addActionListener(this); 
    button4.addActionListener(this); 
    button5.addActionListener(this); 
    button6.addActionListener(this); 
    button7.addActionListener(this); 
    button8.addActionListener(this); 
    button9.addActionListener(this); 
    button10.addActionListener(this); 
    button11.addActionListener(this); 
    button12.addActionListener(this); 
    button14.addActionListener(this); 
} 

public void actionPerformed(ActionEvent ae) { 
    if (ae.getSource() == this.button4) { 
     String A = "1"; 
     Wahl = Wahl + A; 
     waehle(Wahl); 
    } else if (ae.getSource() == this.button5) { 
     String A = "2"; 
     Wahl = Wahl + A; 
     waehle(Wahl); 
    } 

    else if (ae.getSource() == this.button6) { 
     String A = "3"; 
     Wahl = Wahl + A; 
     waehle(Wahl); 
    } else if (ae.getSource() == this.button7) { 
     String A = "4"; 
     Wahl = Wahl + A; 
     waehle(Wahl); 
    } else if (ae.getSource() == this.button8) { 
     String A = "5"; 
     Wahl = Wahl + A; 
     waehle(Wahl); 
    } else if (ae.getSource() == this.button9) { 
     String A = "6"; 
     Wahl = Wahl + A; 
     waehle(Wahl); 
    } else if (ae.getSource() == this.button10) { 
     String A = "7"; 
     Wahl = Wahl + A; 
     waehle(Wahl); 
    } else if (ae.getSource() == this.button11) { 
     String A = "8"; 
     Wahl = Wahl + A; 
     waehle(Wahl); 
    } else if (ae.getSource() == this.button12) { 
     String A = "9"; 
     Wahl = Wahl + A; 
     waehle(Wahl); 
    } else if (ae.getSource() == this.button14) { 
     String A = "0"; 
     Wahl = Wahl + A; 
     waehle(Wahl); 
    } 

} 

public void waehle(String Wahl) { 
    feld.setText(Wahl); 
} 

public static void main(String[] args) { 
    SwingUtilities.invokeLater(new Runnable() { 

     @Override 
     public void run() { 
      new Handybastler(); 
     } 
    }); 
} 
}