GridBagLayout的使用问题，急！！！！

Question

请教大家，我想生成类似于计算器的界面，上面的“=”是占用两个格的大小。这里我想用网格包布局GridBagLayout.但是不会用。请问怎么设置组件占2个格子.GridBagConstraints类好像只有设置组件在整个网格中的起始位置（gridx,gridy），但没有指定结束位置啊
急！！！

Answer 1

刚又看了下api，好像gridheight和gridewidth是用来设置组件占据的垂直和水平单元格个数，但是整个Frame是分成几行几列呢，这个怎么设置啊

Answer 2

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("SansSerif", 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.show();
     }
 }

Answer 3

不行就setlayout(null)  然后每个按钮都可以 setBounds(int x,int y,int width,int heigth)随便放了

Answer 4

GridBagConstraints类的weightx,weighty表示权重，到底是什么权重啊