gridbagdemo.java

java经典的源代码 我非常喜欢这个源代码 对于编程很有好处

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.applet.Applet;
 public class GridBagDemo extends Applet {
     protected void makebutton(String name, GridBagLayout gridbag, GridBagConstraints c) {
         Button button = new Button(name);
         gridbag.setConstraints(button, c);
         add(button);
     }

     public void init() {
         GridBagLayout gridbag = new GridBagLayout();
         GridBagConstraints c = new GridBagConstraints();
         setFont(new Font("Helvetica", Font.PLAIN, 14));
         setLayout(gridbag);
         c.fill = GridBagConstraints.BOTH;
         c.weightx = 1.0;
         makebutton("Button1", gridbag, c);
         makebutton("Button2", gridbag, c);
         makebutton("Button3", gridbag, c);
                c.gridwidth = GridBagConstraints.REMAINDER; //end row
         makebutton("Button4", gridbag, c);
         c.weightx = 0.0;		   //reset to the default
         makebutton("Button5", gridbag, c); //another row
            c.gridwidth = GridBagConstraints.RELATIVE; //next-to-last in row
         makebutton("Button6", gridbag, c);
            c.gridwidth = GridBagConstraints.REMAINDER; //end row
         makebutton("Button7", gridbag, c);
            c.gridwidth = 1;	   	   //reset to the default
            c.gridheight = 2;
         c.weighty = 1.0;
         makebutton("Button8", gridbag, c);
         c.weighty = 0.0;		   //reset to the default
            c.gridwidth = GridBagConstraints.REMAINDER; //end row
            c.gridheight = 1;		   //reset to the default
         makebutton("Button9", gridbag, c);
         makebutton("Button10", gridbag, c);
         setSize(300, 100);
     }

     public static void main(String args[]) {
            Frame f = new Frame("GridBag Layout Example");
            GridBagDemo ex1 = new GridBagDemo();
            ex1.init();
            f.addWindowListener(new WindowAdapter(){
                        public void windowClosing(WindowEvent e)
                        {
                                //正常退出Java虚拟机
                                System.exit(0);
                        }
                });
            f.add("Center", ex1);
            f.pack();
            f.setSize(f.getPreferredSize());
            f.show();
     }
}