Question

我正在使用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号。生成接口有效，但拨号没有效果。我希望有人可以帮我解决我的问题。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

在开始时初始化Wahl：
```
String     Wahl = "";
```
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;
调用构造函数中的Listener()。

完整的工作来源：

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();
        }
    });
}
}

通过按下的按钮更改Jtextfield（“MobilePhone接口”）

1 个答案: