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本文實例講述了java之swing單選框用法。分享給大家供大家參考。具體如下：

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									import java.awt.*;

									import javax.swing.*;

									import java.awt.event.*;

									public class test extends JApplet

									implements ActionListener{

									  JTextField jtf;

									  public void init(){

									    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);

									    ButtonGroup bg = new ButtonGroup();

									    bg.add(b1);

									    bg.add(b2);

									    bg.add(b3);

									    jtf = new JTextField(15);

									    contentPane.add(jtf);

									  }

									  public void actionPerformed(ActionEvent ae){

									    jtf.setText(ae.getActionCommand());

									  }

									}