import javax.swing.*; import java.awt.*; import java.awt.event.*; public class demo_9 { public static void main(String [] args) { demo_9_1 test=new demo_9_1(); } } class demo_9_1 extends JFrame //implements ActionListener { JPanel cardPanel=new JPanel();//...

结果为下面的图：

import javax.swing.*; import java.awt.*; public class demo_7 { public static void main(String[] args) { demo_7_1 test=new demo_7_1(); } } class demo_7_1 extends JFrame { GridBagLayout gridbaglayout=new GridBagLayout(); GridBagConstraints gridbagconstrai...