计算器java代码，简单的图形界面

七彩焰阳

能实现二进制,八进制,十六进制的转换

1. import java.awt.*;
   
2. import java.awt.event.*;
   
3. 
   
4. public class jisuanqi extends WindowAdapter {
   
5. Panel p1 = new Panel();
   
6. Panel p2 = new Panel();
   
7. Panel p3 = new Panel();
   
8. TextField txt;
   
9. private Button[] b = new Button[17];
   
10. private String ss[] = { "7", "8", "9", "+", "4", "5", "6", "-", "1", "2",
    
11.    "3", "*", "清空", "0", "=", "/", "关闭" };
    
12. static double a;
    
13. static String s, str;//定义变量 创建对像
    
14. 
    
15. public static void main(String args[]) {
    
16.   (new jisuanqi()).frame();
    
17. }
    
18. 
    
19. public void frame() {
    
20.   Frame fm = new Frame("简单计算器");
    
21.   for (int i = 0; i <= 16; i++) {
    
22.    b[i] = new Button(ss[i]);
    
23.   }                              
    
24.   for (int i = 0; i <= 15; i++) {
    
25.    p2.add(b[i]);
    
26.   }                               //创建按钮 并添加到P2
    
27.   b[16].setBackground(Color.yellow);
    
28.   txt = new TextField(15);
    
29.   txt.setEditable(false);
    
30.   for (int i = 0; i <= 16; i++) {
    
31.    b[i].addActionListener(new buttonlistener());//添加监听器
    
32.   }
    
33.   b[16].addActionListener(new close());
    
34.   fm.addWindowListener(this);
    
35.   fm.setBackground(Color.red);
    
36.   p1.setLayout(new BorderLayout());
    
37.   p1.add(txt, "North");
    
38.   p2.setLayout(new GridLayout(4, 4));
    
39.   p3.setLayout(new BorderLayout());
    
40.   p3.add(b[16]);
    
41.   fm.add(p1, "North");
    
42.   fm.add(p2, "Center");
    
43.   fm.add(p3, "South");
    
44.   fm.pack();
    
45.   fm.setVisible(true);//都是些窗中设置 添加相关组件和监听器
    
46. }
    
47. 
    
48. public void windowClosing(WindowEvent e) {
    
49.   System.exit(0);//退出系统
    
50. }
    
51. 
    
52. class buttonlistener implements ActionListener {//编写监听器事件 通过按键得出给果
    
53.   public void actionPerformed(ActionEvent e) {
    
54.    Button btn = (Button) e.getSource();
    
55.    if (btn.getLabel() == "=") {
    
56.     jisuan();
    
57.     str = String.valueOf(a);
    
58.     txt.setText(str);
    
59.     s = "";
    
60.    } else if (btn.getLabel() == "+") {
    
61.     jisuan();
    
62.     txt.setText("");
    
63.     s = "+";
    
64.    } else if (btn.getLabel() == "-") {
    
65.     jisuan();
    
66.     txt.setText("");
    
67.     s = "-";
    
68.    } else if (btn.getLabel() == "/") {
    
69.     jisuan();
    
70.     txt.setText("");
    
71.     s = "/";
    
72. 
    
73.    } else if (btn.getLabel() == "*") {
    
74.     jisuan();
    
75.     txt.setText("");
    
76.     s = "*";
    
77.    } else {
    
78.     txt.setText(txt.getText() + btn.getLabel());
    
79. 
    
80.     if (btn.getLabel() == "清空")
    
81.      txt.setText("");
    
82.    }
    
83.   }
    
84. 
    
85.   public void jisuan() {//编写具体计算方法
    
86.    if (s == "+")
    
87.     a += Double.parseDouble(txt.getText());
    
88.    else if (s == "-")
    
89.     a -= Double.parseDouble(txt.getText());
    
90.    else if (s == "*")
    
91.     a *= Double.parseDouble(txt.getText());
    
92.    else if (s == "/")
    
93.     a /= Double.parseDouble(txt.getText());
    
94.    else
    
95.     a = Double.parseDouble(txt.getText());
    
96.   }
    
97. }
    
98. }
    
99. 
    
100. class close implements ActionListener {//退出
     
101. public void actionPerformed(ActionEvent e) {
     
102.   System.exit(0);
     
103. }
     
104. }

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