JRadioButton 问题

Question

我想实现这样一个效果 
现在有
JFrame f
JRadioButton r1,r2
JTextField t1, t2
JButton b1
ButtonGroup在t1 t2 中分别输入2个数
选择r1 然后点b1 执行一个事件 比如 两个数相加
选择r2时  点b2 执行另一个  比如 两个数想减现在我不会做的就是 在同一个 JFrame里  要这么执行 就要监听r1和b1或者r2和b2（我是这样想的）但是如何做2个有关联的监听呢……我不大会做…… 
请高人指点……

Answer 1

import javax.swing.JOptionPane;/*
 * Demo.java
 *
 * Created on 2008年11月23日, 下午8:44
 *//**
 *
 * @author  jhwang
 */
public class Demo extends javax.swing.JFrame {
        /** Creates new form Demo */
    public Demo() {
        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() {        buttonGroup1 = new javax.swing.ButtonGroup();
        jPanel1 = new javax.swing.JPanel();
        jPanel4 = new javax.swing.JPanel();
        jLabel2 = new javax.swing.JLabel();
        num2Field = new javax.swing.JTextField();
        jPanel5 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        num1Field = new javax.swing.JTextField();
        jPanel6 = new javax.swing.JPanel();
        jLabel3 = new javax.swing.JLabel();
        resultLabel = new javax.swing.JLabel();
        jPanel2 = new javax.swing.JPanel();
        addRadio = new javax.swing.JRadioButton();
        minusRadio = new javax.swing.JRadioButton();
        jPanel3 = new javax.swing.JPanel();
        submit = new javax.swing.JButton();
        reset = new javax.swing.JButton();        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Demo");        jPanel1.setLayout(new java.awt.BorderLayout());        jLabel2.setText("num2：");
        jPanel4.add(jLabel2);        num2Field.setMinimumSize(new java.awt.Dimension(30, 22));
        num2Field.setPreferredSize(new java.awt.Dimension(150, 22));
        jPanel4.add(num2Field);        jPanel1.add(jPanel4, java.awt.BorderLayout.SOUTH);        jLabel1.setText("num1：");
        jPanel5.add(jLabel1);        num1Field.setMinimumSize(new java.awt.Dimension(100, 22));
        num1Field.setPreferredSize(new java.awt.Dimension(150, 22));
        jPanel5.add(num1Field);        jPanel1.add(jPanel5, java.awt.BorderLayout.CENTER);        jLabel3.setText("结果：");
        jPanel6.add(jLabel3);        resultLabel.setPreferredSize(new java.awt.Dimension(150, 20));
        jPanel6.add(resultLabel);        jPanel1.add(jPanel6, java.awt.BorderLayout.NORTH);        getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);        buttonGroup1.add(addRadio);
        addRadio.setSelected(true);
        addRadio.setText("加法");
        addRadio.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                addRadioActionPerformed(evt);
            }
        });
        jPanel2.add(addRadio);        buttonGroup1.add(minusRadio);
        minusRadio.setText("减法");
        minusRadio.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                minusRadioActionPerformed(evt);
            }
        });
        jPanel2.add(minusRadio);        getContentPane().add(jPanel2, java.awt.BorderLayout.NORTH);        submit.setText("确定");
        submit.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                submitActionPerformed(evt);
            }
        });
        jPanel3.add(submit);        reset.setText("取消");
        reset.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                resetActionPerformed(evt);
            }
        });
        jPanel3.add(reset);        getContentPane().add(jPanel3, java.awt.BorderLayout.SOUTH);        pack();
    }// </editor-fold>private void addRadioActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
    flag = 0;
}private void minusRadioActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
    flag = 1;
}private void submitActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
    double num1 = 0,num2 = 0;
    try{
        num1 = Double.valueOf(num1Field.getText());
    }catch(Exception e){
        JOptionPane.showMessageDialog(this, "num1中只能是数字！");
        return;
    }
     try{
         num2 = Double.valueOf(num2Field.getText());
    }catch(Exception e){
          JOptionPane.showMessageDialog(this, "num2中只能是数字！");
        return;
    }
    
    if(flag == 0){
        resultLabel.setText(String.valueOf(num1+num2));
    }else if(flag == 1){
        resultLabel.setText(String.valueOf(num1-num2));
    }else{
        resultLabel.setText("出现无法预料的错误！");
    }
}private void resetActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
    System.exit(0);
}    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Demo().setVisible(true);
            }
        });
    }    // Variables declaration - do not modify
    private javax.swing.JRadioButton addRadio;
    private javax.swing.ButtonGroup buttonGroup1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JPanel jPanel3;
    private javax.swing.JPanel jPanel4;
    private javax.swing.JPanel jPanel5;
    private javax.swing.JPanel jPanel6;
    private javax.swing.JRadioButton minusRadio;
    private javax.swing.JTextField num1Field;
    private javax.swing.JTextField num2Field;
    private javax.swing.JButton reset;
    private javax.swing.JLabel resultLabel;
    private javax.swing.JButton submit;
    // End of variables declarationprivate int flag = 0;//标记进行的是 + - 运算
}

Answer 2

import javax.swing.JOptionPane;/*
 * Demo.java
 *
 * Created on 2008年11月23日, 下午8:44
 *//**
 *
 * @author  jhwang
 */
public class Demo extends javax.swing.JFrame {
        /** Creates new form Demo */
    public Demo() {
        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() {        buttonGroup1 = new javax.swing.ButtonGroup();
        jPanel1 = new javax.swing.JPanel();
        jPanel4 = new javax.swing.JPanel();
        jLabel2 = new javax.swing.JLabel();
        num2Field = new javax.swing.JTextField();
        jPanel5 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        num1Field = new javax.swing.JTextField();
        jPanel6 = new javax.swing.JPanel();
        jLabel3 = new javax.swing.JLabel();
        resultLabel = new javax.swing.JLabel();
        jPanel2 = new javax.swing.JPanel();
        addRadio = new javax.swing.JRadioButton();
        minusRadio = new javax.swing.JRadioButton();
        jPanel3 = new javax.swing.JPanel();
        submit = new javax.swing.JButton();
        reset = new javax.swing.JButton();        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Demo");        jPanel1.setLayout(new java.awt.BorderLayout());        jLabel2.setText("num2：");
        jPanel4.add(jLabel2);        num2Field.setMinimumSize(new java.awt.Dimension(30, 22));
        num2Field.setPreferredSize(new java.awt.Dimension(150, 22));
        jPanel4.add(num2Field);        jPanel1.add(jPanel4, java.awt.BorderLayout.SOUTH);        jLabel1.setText("num1：");
        jPanel5.add(jLabel1);        num1Field.setMinimumSize(new java.awt.Dimension(100, 22));
        num1Field.setPreferredSize(new java.awt.Dimension(150, 22));
        jPanel5.add(num1Field);        jPanel1.add(jPanel5, java.awt.BorderLayout.CENTER);        jLabel3.setText("结果：");
        jPanel6.add(jLabel3);        resultLabel.setPreferredSize(new java.awt.Dimension(150, 20));
        jPanel6.add(resultLabel);        jPanel1.add(jPanel6, java.awt.BorderLayout.NORTH);        getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);        buttonGroup1.add(addRadio);
        addRadio.setSelected(true);
        addRadio.setText("加法");
        addRadio.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                addRadioActionPerformed(evt);
            }
        });
        jPanel2.add(addRadio);        buttonGroup1.add(minusRadio);
        minusRadio.setText("减法");
        minusRadio.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                minusRadioActionPerformed(evt);
            }
        });
        jPanel2.add(minusRadio);        getContentPane().add(jPanel2, java.awt.BorderLayout.NORTH);        submit.setText("确定");
        submit.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                submitActionPerformed(evt);
            }
        });
        jPanel3.add(submit);        reset.setText("取消");
        reset.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                resetActionPerformed(evt);
            }
        });
        jPanel3.add(reset);        getContentPane().add(jPanel3, java.awt.BorderLayout.SOUTH);        pack();
    }// </editor-fold>private void addRadioActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
    flag = 0;
}private void minusRadioActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
    flag = 1;
}private void submitActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
    double num1 = 0,num2 = 0;
    try{
        num1 = Double.valueOf(num1Field.getText());
    }catch(Exception e){
        JOptionPane.showMessageDialog(this, "num1中只能是数字！");
        return;
    }
     try{
         num2 = Double.valueOf(num2Field.getText());
    }catch(Exception e){
          JOptionPane.showMessageDialog(this, "num2中只能是数字！");
        return;
    }
    
    if(flag == 0){
        resultLabel.setText(String.valueOf(num1+num2));
    }else if(flag == 1){
        resultLabel.setText(String.valueOf(num1-num2));
    }else{
        resultLabel.setText("出现无法预料的错误！");
    }
}private void resetActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
    System.exit(0);
}    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Demo().setVisible(true);
            }
        });
    }    // Variables declaration - do not modify
    private javax.swing.JRadioButton addRadio;
    private javax.swing.ButtonGroup buttonGroup1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JPanel jPanel3;
    private javax.swing.JPanel jPanel4;
    private javax.swing.JPanel jPanel5;
    private javax.swing.JPanel jPanel6;
    private javax.swing.JRadioButton minusRadio;
    private javax.swing.JTextField num1Field;
    private javax.swing.JTextField num2Field;
    private javax.swing.JButton reset;
    private javax.swing.JLabel resultLabel;
    private javax.swing.JButton submit;
    // End of variables declarationprivate int flag = 0;//标记进行的是 + - 运算
}