我的代碼：
1 // windows
2
3
4 /*
5 版本 1.0
6
7 顯示一行數字
8 簡單二元運算
9 數字為 double 型
10 無輸入數字位數限制
11 可輸入過多的小數點
12
13 界面：
14 7 8 9 + p
15 4 5 6 – mod
16 1 2 3 * pow
17 0 . = / ac
18 */
19
20 import java.awt.*;
21 import java.awt.event.*;
22
23 public class Calculator extends Frame implements ActionListener {
24
25 public static void main(String[] args) {
26 new Calculator();
27 }
28
29 public Calculator() {
30 super( “計算器 — 趙傑” );
31
32 // keyBoard and key
33 key = new Button[ 300 ];
34 Panel kb = new Panel();
35 kb.setLayout( new GridLayout( 4, 5, 3, 3 ) );
36 int i;
37
38 key[ i = (int)7 ] = new Button( “7” );
39 key[ i ].addActionListener( this );
40 kb.add( key[ i ] );
41
42 key[ i = (int)8 ] = new Button( “8” );
43 key[ i ].addActionListener( this );
44 kb.add( key[ i ] );
45
46 key[ i = (int)9 ] = new Button( “9” );
47 key[ i ].addActionListener( this );
48 kb.add( key[ i ] );
49
50 key[ i = (int)+ ] = new Button( “+” );
51 key[ i ].addActionListener( this );
52 kb.add( key[ i ] );
53
54 key[ i = (int)d ] = new Button( “p” );
55 key[ i ].addActionListener( this );
56 kb.add( key[ i ] );
57
58 key[ i = (int)4 ] = new Button( “4” );
59 key[ i ].addActionListener( this );
60 kb.add( key[ i ] );
61
62 key[ i = (int)5 ] = new Button( “5” );
63 key[ i ].addActionListener( this );
64 kb.add( key[ i ] );
65
66 key[ i = (int)6 ] = new Button( “6” );
67 key[ i ].addActionListener( this );
68 kb.add( key[ i ] );
69
70 key[ i = (int)- ] = new Button( “-” );
71 key[ i ].addActionListener( this );
72 kb.add( key[ i ] );
73
74 key[ i = (int)m ] = new Button( “mod” );
75 key[ i ].addActionListener( this );
76 kb.add( key[ i ] );
77
78 key[ i = (int)1 ] = new Button( “1” );
79 key[ i ].addActionListener( this );
80 kb.add( key[ i ] );
81
82 key[ i = (int)2 ] = new Button( “2” );
83 key[ i ].addActionListener( this );
84 kb.add( key[ i ] );
85
86 key[ i = (int)3 ] = new Button( “3” );
87 key[ i ].addActionListener( this );
88 kb.add( key[ i ] );
89
90 key[ i = (int)* ] = new Button( “*” );
91 key[ i ].addActionListener( this );
92 kb.add( key[ i ] );
93
94
