import javax.swing.JFrame ; import javax.swing.JToggleButton ; import java.awt.GridLayout ; public class JToggleButtonDemo01{ public static void main(String args[]){ JFrame frame = new JFrame("Welcome To MLDN") ; JToggleButton but1 = new JToggleButton("已选中",true) ; // 默认选中 JToggleButton but2 = new JToggleButton("未选中") ; JToggleButton but3 = new JToggleButton("按我") ; frame.setLayout(new GridLayout(3,1)) ; // 设置排版样式 frame.add(but1) ; frame.add(but2) ; frame.add(but3) ; frame.setSize(200,100) ; frame.setLocation(300,200) ; frame.setVisible(true) ; } };