拖动JFrame后，其他控件也随之变化

Question

一个JFrame上添加了几个jbutton，现在我想实现当拖动jframe大小时，jbutton也按照一定的比例随之变化，整个样子不会走形。
如何实现？

Answer 1

正好手头有代码，给你一个package test.org.ross.util;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class GridBagLayoutDemo{
   public GridBagLayoutDemo(){
      JButton b;
      GridBagConstraints c;
      int gridx,gridy,gridwidth,gridheight,anchor,fill,ipadx,ipady;
      double weightx,weighty;
      Insets inset;
      
      JFrame f=new JFrame();
      
      GridBagLayout gridbag=new GridBagLayout();
        Container contentPane=f.getContentPane();
        contentPane.setLayout(gridbag);
        
        b=new JButton("first");
        gridx=0;
        gridy=0;
        gridwidth=1;
        gridheight=1;
        weightx=10;
        weighty=1;
        anchor=GridBagConstraints.CENTER;
        fill=GridBagConstraints.HORIZONTAL;
        inset=new Insets(0,0,0,0);
        ipadx=0;
        ipady=0;
        c=new GridBagConstraints(gridx,gridy,gridwidth,gridheight,weightx,weighty,anchor,
           fill,inset,ipadx,ipady);
        gridbag.setConstraints(b,c);
        contentPane.add(b);
        
        
        b=new JButton("second");
        gridx=1;
        gridy=0;
        gridwidth=2;
        gridheight=1;
        weightx=1;
        weighty=1;
        anchor=GridBagConstraints.CENTER;
        fill=GridBagConstraints.HORIZONTAL;
        inset=new Insets(0,0,0,0);
        ipadx=50;
        ipady=0;
        c=new GridBagConstraints(gridx,gridy,gridwidth,gridheight,weightx,weighty,anchor,
           fill,inset,ipadx,ipady);
        gridbag.setConstraints(b,c);
        contentPane.add(b);        b=new JButton("third");
        gridx=0;
        gridy=1;
        gridwidth=1;
        gridheight=1;
        weightx=1;
        weighty=1;
        anchor=GridBagConstraints.CENTER;
        fill=GridBagConstraints.HORIZONTAL;
        inset=new Insets(0,0,0,0);
        ipadx=0;
        ipady=50;
        c=new GridBagConstraints(gridx,gridy,gridwidth,gridheight,weightx,weighty,anchor,
           fill,inset,ipadx,ipady);
        gridbag.setConstraints(b,c);
        contentPane.add(b);
        
        b=new JButton("fourth");
        gridx=1;
        gridy=1;
        gridwidth=1;
        gridheight=1;
        weightx=1;
        weighty=1;
        anchor=GridBagConstraints.CENTER;
        fill=GridBagConstraints.HORIZONTAL;
        inset=new Insets(0,0,0,0);
        ipadx=0;
        ipady=0;
        c=new GridBagConstraints(gridx,gridy,gridwidth,gridheight,weightx,weighty,anchor,
           fill,inset,ipadx,ipady);
        gridbag.setConstraints(b,c);
        contentPane.add(b);        b=new JButton("This is the last button");
        gridx=2;
        gridy=1;
        gridwidth=1;
        gridheight=2;
        weightx=1;
        weighty=1;
        anchor=GridBagConstraints.CENTER;
        fill=GridBagConstraints.HORIZONTAL;
        inset=new Insets(0,0,0,0);
        ipadx=0;
        ipady=50;
        c=new GridBagConstraints(gridx,gridy,gridwidth,gridheight,weightx,weighty,anchor,
           fill,inset,ipadx,ipady);
        gridbag.setConstraints(b,c);
        contentPane.add(b);        f.setTitle("GridBagLayout");
        f.pack();
        f.setVisible(true);
      f.addWindowListener(
           new WindowAdapter(){
               public void windowClosing(WindowEvent e){
                  System.exit(0);
               }
           }
      );       
   }
   public static void main(String[] args){
      new GridBagLayoutDemo();
   }
}

Answer 2

不只是GridBagLayout，几乎所有的布局管理器都能实现实时改变大小的

Answer 3

楼主上sun官网看看How to use Layout