GridBagLayout官方例子

Button1、Button2、Button3： weightx = 1.0 //(权重)会得到额外空间
Button4：weightx = 1.0、gridwidth = GridBagConstraints.REMAINDER //行中的单元格数.最后一个
Button5：gridwidth = GridBagConstraints.REMAINDER //行中的单元格数.最后一个
Button6：gridwidth = GridBagConstraints.RELATIVE //行中的单元格数.倒数第二个
Button7：gridwidth = GridBagConstraints.REMAINDER //行中的单元格数.最后一个
Button8：gridheight = 2、weighty = 1.0
Button9、Button 10：gridwidth = GridBagConstraints.REMAINDER //行中的单元格数.最后一个 

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

 public class GridBagEx1 extends Applet {
 
     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.show();
         }
        //约束
     protected void makebutton(String name,GridBagLayout     gridbag,GridBagConstraints c) 
         {
             Button button = new Button(name);
             gridbag.setConstraints(button, c);
             add(button);
         }

     public void init() {
        //创建布局以及约束对象
         GridBagLayout gridbag = new GridBagLayout();
         GridBagConstraints c = new GridBagConstraints();
    
         setFont(new Font("SansSerif", Font.PLAIN, 14));
         setLayout(gridbag);
    
         c.fill = GridBagConstraints.BOTH;//组件填充 当组件空间大于组件本身时，要将组建置于何处。
         c.weightx = 1.0;//X值随着窗口的变大而变大
         makebutton("Button1", gridbag, c);
         makebutton("Button2", gridbag, c);
         makebutton("Button3", gridbag, c);
    
         c.gridwidth = GridBagConstraints.REMAINDER; //"剩余的"最后一个单元格
         makebutton("Button4", gridbag, c);

         c.weightx = 0.0; //默认值,不会随着窗口变大而变大
         makebutton("Button5", gridbag, c); //新一行

         c.gridwidth = GridBagConstraints.RELATIVE; //倒数第二个单元格
         makebutton("Button6", gridbag, c);

         c.gridwidth = GridBagConstraints.REMAINDER; //最后一个单元格
         makebutton("Button7", gridbag, c);

         c.gridwidth = 1;  //单元格的宽为1
         c.gridheight = 2; //单元格的高为2
         c.weighty = 1.0;
         makebutton("Button8", gridbag, c);

         c.weighty = 0.0;
         c.gridwidth = GridBagConstraints.REMAINDER; //自后一个
         c.gridheight = 1;
         makebutton("Button9", gridbag, c);
         makebutton("Button10", gridbag, c);
         setSize(300, 100);
     }
 }