1 import java.awt.BorderLayout;  2   3 import javax.swing.*;  4 public class ForJava {  5   6     public static void main(String[] args) {          7         JFrame frame=new CCal(400,300);  8         frame.setVisible(true);  9     } 10 } 11 class CCal extends JFrame{ 12     public CCal(int w,int h){ 13         setLocation(200, 160); 14         setSize(w, h); 15         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 16          17          18         JPanel displayPanel=new JPanel(); 19         JButton cbtn=new JButton(); 20         cbtn.setText("c"); 21         displayPanel.add(cbtn); 22          23         JTextArea display=new JTextArea(); 24         display.setColumns(20); 25         displayPanel.add(display); 26         getContentPane().add(displayPanel, BorderLayout.NORTH); 27          28         JPanel panelTemp1=new JPanel(); 29         panelTemp1.setLayout(new BorderLayout()); 30         getContentPane().add(panelTemp1); 31          32         JPanel cachePanel=new JPanel(); 33         panelTemp1.add(cachePanel, BorderLayout.NORTH); 34         JButton mbtnMR=new JButton(); 35         mbtnMR.setText("MR"); 36         cachePanel.add(mbtnMR); 37         JButton mbtnMC=new JButton(); 38         mbtnMC.setText("MC"); 39         cachePanel.add(mbtnMC); 40         JButton mbtnMS=new JButton(); 41         mbtnMS.setText("MS"); 42         cachePanel.add(mbtnMS); 43         JButton mbtnMP=new JButton(); 44         mbtnMP.setText("M+"); 45         cachePanel.add(mbtnMP); 46          47          48         JPanel panelTemp2=new JPanel(); 49         panelTemp2.setLayout(new BorderLayout()); 50         panelTemp1.add(panelTemp2); 51          52         JPanel panelButton1=new JPanel(); 53         panelTemp2.add(panelButton1, BorderLayout.NORTH); 54         JButton mbtn1=new JButton(); 55         mbtn1.setText("1"); 56         panelButton1.add(mbtn1); 57         JButton mbtn2=new JButton(); 58         mbtn2.setText("2"); 59         panelButton1.add(mbtn2); 60         JButton mbtn3=new JButton(); 61         mbtn3.setText("3"); 62         panelButton1.add(mbtn3); 63         JButton mbtnP=new JButton(); 64         mbtnP.setText("+"); 65         panelButton1.add(mbtnP); 66          67         JPanel panelTemp3=new JPanel(); 68         panelTemp3.setLayout(new BorderLayout()); 69         panelTemp2.add(panelTemp3); 70          71         JPanel panelButton2=new JPanel(); 72         panelTemp3.add(panelButton2, BorderLayout.NORTH); 73         JButton mbtn4=new JButton(); 74         mbtn4.setText("4"); 75         panelButton2.add(mbtn4); 76         JButton mbtn5=new JButton(); 77         mbtn5.setText("5"); 78         panelButton2.add(mbtn5); 79         JButton mbtn6=new JButton(); 80         mbtn6.setText("6"); 81         panelButton2.add(mbtn6); 82         JButton mbtnMi=new JButton(); 83         mbtnMi.setText("-"); 84         panelButton2.add(mbtnMi); 85          86         JPanel panelTemp4=new JPanel(); 87         panelTemp4.setLayout(new BorderLayout()); 88         panelTemp3.add(panelTemp4); 89          90         JPanel panelButton3=new JPanel(); 91         panelTemp4.add(panelButton3, BorderLayout.NORTH); 92         JButton mbtn7=new JButton(); 93         mbtn7.setText("7"); 94         panelButton3.add(mbtn7); 95         JButton mbtn8=new JButton(); 96         mbtn8.setText("8"); 97         panelButton3.add(mbtn8); 98         JButton mbtn9=new JButton(); 99         mbtn9.setText("9");100         panelButton3.add(mbtn9);101         JButton mbtnMu=new JButton();102         mbtnMu.setText("*");103         panelButton3.add(mbtnMu);104         105         JPanel panelTemp5=new JPanel();106         panelTemp5.setLayout(new BorderLayout());107         panelTemp4.add(panelTemp5);108         109         JPanel panelButton4=new JPanel();110         panelTemp5.add(panelButton4, BorderLayout.NORTH);111         JButton mbtn0=new JButton();112         mbtn0.setText("0");113         panelButton4.add(mbtn0);114         JButton mbtnPorM=new JButton();115         mbtnPorM.setText("+/-");116         panelButton4.add(mbtnPorM);117         JButton mbtnEq=new JButton();118         mbtnEq.setText("=");119         panelButton4.add(mbtnEq);120         JButton mbtnDiv=new JButton();121         mbtnDiv.setText("/");122         panelButton4.add(mbtnDiv);123     }124     125     126 }

 1 JPanel up1=new JPanel(); 2 /*增加button等*/ 3 getContentPane().add(up1,BorderLayout.north)); 4  5 JPanel down1 = new JPanel(); 6 down1.setLayout(new BorderLayout()); 7 getContentPane().add(down1,BorderLayout.north)); 8 /*down1不增加button这些控件，只作为下一个Jpanel的底层/* 9 10 JPanel up2 = new JPanel();11 down1.add(up2,BorderLayout.NORTH));12 /*添加控件*/13 14 JPanel down2 = new Jpanel();15 down2.setLayout(new BorderLayout());16 down1.add(down2);17 //.......................