jradiobuttondemo.java

java课程的资料以及实验的代码

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JRadioButtonDemo extends JFrame implements ActionListener  {
  JTextField jtf;
  public JRadioButtonDemo() {
    Container contentPane = getContentPane();
    contentPane.setLayout(new FlowLayout());

    JRadioButton b1 = new JRadioButton("A");
    b1.addActionListener(this);
    contentPane.add(b1);

    JRadioButton b2 = new JRadioButton("B");
    b2.addActionListener(this);
    contentPane.add(b2);

    JRadioButton b3 = new JRadioButton("C");
    b3.addActionListener(this);
    contentPane.add(b3);
      
    //定义按钮组，将单选按钮加入组中
    ButtonGroup bg = new ButtonGroup();
    bg.add(b1);
    bg.add(b2);
    bg.add(b3);

    jtf = new JTextField(5);
    contentPane.add(jtf);
 	}
 	
  public void actionPerformed(ActionEvent ae) {
    jtf.setText(ae.getActionCommand());
  }

  public static void main(String[] args){
  	JRadioButtonDemo s=new JRadioButtonDemo();
  	s.setSize(300,100);
  	s.setVisible(true);
  }
}