import java.awt.*;

import javax.swing.*;

public class Radiotest extends JApplet

{

 public void init(){

  Container c= getContentPane();

  ButtonGroup  g = new ButtonGroup();

  setLayout(new GridLayout(0,1)); //布局格式

  JRadioButton b= new JRadioButton("this is a test",true);

  g.add(b);

  c.add(b);

  b= new JRadioButton("this is a test",false);

  g.add(b);

  c.add(b);

  b= new JRadioButton("this is a test",false);

  g.add(b);

  c.add(b);

 }

}

java单选框窗口
思路：先创建一个窗口，记得用container ，然后看情况写用相应jlabel写相应的内容。再用就jradiojuttun 和juttungrap来实现单选框。

注意点：要实行单选框用完jradiojuttun一定要用juttungrap 。
在这里插入代码片
public class Demo2 {
	public static void main(String[] args) {
	// TODO Auto-generated method stub
	JFrame jf=new JFrame("选择窗口界面");	
	jf.setSize(300, 300);		
	jf.setLocationRelativeTo(jf);		
	Container contentPane=jf.getContentPane();		
	contentPane.setLayout(new BorderLayout());
	JLabel lb1=new JLabel("请选择相应的窗口！");		
	contentPane.add(lb1,BorderLayout.NORTH);
	JPanel p1=new JPanel();		
	contentPane.add(p1,BorderLayout.CENTER);		
	JRadioButton j_1=new JRadioButton("java");		
	p1.add(j_1);		
	JRadioButton j_2=new JRadioButton("c++");		
	p1.add(j_2);		
	JRadioButton j_3=new JRadioButton("c");		
	p1.add(j_3);		
	ButtonGroup g=new ButtonGroup();		
	g.add(j_1);		
	g.add(j_2);		
	g.add(j_3);		
	jf.setVisible(true);		
		}}

privateJRadioButtongetJRadioButton1(){if(jRadioButton1==null){jRadioButton1=newJRadioButton();jRadioButton1.setSelected(true);jRadioButton1.setText("\u6309\u7f16\u53f7");...
private JRadioButton getJRadioButton1() {
if(jRadioButton1 == null) {
jRadioButton1 = new JRadioButton();
jRadioButton1.setSelected(true);
jRadioButton1.setText("\u6309 \u7f16 \u53f7");
jRadioButton1.setBounds(340, 115, 74, 23);
}
return jRadioButton1;
}
private JRadioButton getJRadioButton2() {
if(jRadioButton2 == null) {
jRadioButton2 = new JRadioButton();
jRadioButton2.setText("\u6309 \u7247 \u540d");
jRadioButton2.setBounds(340, 137, 74, 23);
}
return jRadioButton2;
}
private JLabel getJLabel2() {
if(jLabel2 == null) {
jLabel2 = new JLabel();
jLabel2.setText("\u63d0\u793a:");
jLabel2.setBounds(340, 442, 44, 15);
}
return jLabel2;
}
private JLabel getJLabel11() {
if(jLabel11 == null) {
jLabel11 = new JLabel();
jLabel11.setText("\u5982\u6240\u67e5\u8be2\u7684\u97f3\u50cf\u5df2\u501f\u51fa\uff0c\u70b9\u51fb\u7ee7\u7eed\uff0c\u6309\u59d3\u540d\u67e5\u627e\u3002");
jLabel11.setBounds(379, 442, 396, 15);
}
return jLabel11;
}
private void jButton2ActionPerformed(ActionEvent evt) {
System.out.println("jButton2.actionPerformed, event="+evt);
//TODO add your code for jButton2.actionPerformed
}
public static void main(String[] args) {
ButtonGroup group = new ButtonGroup ();
group.add(jRadioButton1);
group.add(jRadioButton2);
}
}
运行没有错误但是为什么还是两个选项都能选呢？
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java的swing单选框用法示例
本文实例讲述了java之swing单选框用法。具体如下：
import java.awt.*;import javax.swing.*;import java.awt.event.*;public class test extends JAppletimplements 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()); }}
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