gridbagex1.java

GridBag实例源码

import java.awt.*;
import java.util.*;
import java.applet.Applet;

public class GridBagEx1 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");
   GridBagEx1 ex1 = new GridBagEx1();
   ex1.init();
   f.add("Center", ex1);
   f.pack();
   //f.setSize(f.getPreferredSize());
   f.setVisible(true);
 }
}