JPanel写一个单选框二选一

用ButtonGroup和JRadioButton配合即可。

import java.awt.BorderLayout;

import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;

public class RadioTest extends JFrame {
	public static void main(String[] args) {
		new RadioTest();
	}

	public RadioTest() {
		this.setSize(800, 600);
		this.setDefaultCloseOperation(EXIT_ON_CLOSE);
		JRadioButton button = new JRadioButton("apple");
		JRadioButton button2 = new JRadioButton("banana");
		ButtonGroup group = new ButtonGroup();
		group.add(button);
		group.add(button2);
		JPanel panel = new JPanel();
		panel.add(button);
		panel.add(button2);
		this.add(panel, BorderLayout.NORTH);
		this.setVisible(true);
	}
}

/**
* 设置一个单选框
* @param jpx X坐标
* @param jpy Y坐标
* @param jpw 宽
* @param jph 高
* @param names 单选框的值，动态参数，第一个参数默认选中
* @return
*/
public JPanel setJradioButton(int jpx, int jpy, int jpw, int jph, String... names){
JPanel JRadiojPane = new JPanel();
JRadiojPane.setBounds(jpx, jpy, jpw, jph);
ButtonGroup gchu = new ButtonGroup();
for (String str : names){
JRadioButton jb = new JRadioButton(str, true);
gchu.add(jb);
JRadiojPane.add(jb);
}
return JRadiojPane;
}

/**
* 获取JPanel中单选框的值，JRadiojPane必须定义为final
* @param JRadiojPane
* @return
*/
public String getJrdioButtonText(JPanel JRadiojPane) {
String name = null;
int count = JRadiojPane.getComponentCount();
for (int i = 0; i < count; i++) {
Component comp = JRadiojPane.getComponent(i);
if (comp instanceof JRadioButton) {
JRadioButton btn = (JRadioButton) comp;
if (btn.isSelected()) {
name = btn.getText();
return name;
}
}
}
return name;
}

用法：
//创建一个单选器
final JPanel JRadiojPane = setJradioButton(X, Y, W, H,"单选1","单选2",,"单选3");
//将单选器加到面板中
jPanel.add(JRadiojPane);

//获取单选框的值
String dbName = getJrdioButtonText(JRadiojPane);