Java ?????С?????????+??????
???????????? ???????[ 2014/12/8 11:05:39 ] ????????Java
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1 /*CJSCalculator.java 2014.8.4 by cjs
2 *????????м?????????????????????????????????
3 *?????“OK”???????????12+2????????????????????????
4 *?????????????????????????У??????????????????????????
5 *?????????汾????????????????????????????????????
6 **/
7
8 import java.awt.*;
9 import javax.swing.*;
10 import java.awt.event.*;
11 public class CjsCalculator extends JFrame implements ActionListener {
12 /* ???Jframe ??? ActionListener ???*/
13
14 //Э????????
15 private class WindowCloser extends WindowAdapter {
16 public void windowClosing(WindowEvent we) {
17 System.exit(0);
18 }
19 }
20 //strings for operator buttons.
21
22 private String[] str = { "+"?? "-"?? "*"?? "/"?? "OK"};
23
24 //build buttons.
25
26 JButton[] Obuttons = new JButton[str.length];
27 //reset button
28 JButton Rbutton = new JButton("reset");
29
30 //build textfield to show num and result
31
32 private JTextField display = new JTextField("0");
33 private JTextField Fnum = new JTextField("");
34 private JTextField Snum = new JTextField("");
35 private JTextField Otext = new JTextField("");
36 private JTextField Deng = new JTextField("=");
37
38 int i = 0;
39
40 //?????????????
41 public CjsCalculator() {
42
43 Deng.setEditable(false);
44 display.setEditable(false);
45 Otext.setEditable(false);
46 //super ????
47 // super("Calculator");
48
49 //panel ???????
50 JPanel panel1 = new JPanel(new GridLayout(1??5));
51 for (i = 0; i < str.length; i++) {
52 Obuttons[i] = new JButton(str[i]);
53 Obuttons[i].setBackground(Color.YELLOW);
54 panel1.add(Obuttons[i]);
55 }
56
57 JPanel panel2 = new JPanel(new GridLayout(1??5));
58 panel2.add(Fnum);
59 panel2.add(Otext);
60 panel2.add(Snum);
61 panel2.add(Deng);
62 panel2.add(display);
63
64 JPanel panel3 = new JPanel(new GridLayout(1??1));
65 panel3.add(Rbutton);
66 //?????????
67 getContentPane().setLayout(new BorderLayout());
68 getContentPane().add("North"??panel2);
69 getContentPane().add("Center"??panel1);
70 getContentPane().add("South"??panel3);
71 //Add listener for Obuttons.
72 for (i = 0; i < str.length; i++)
73 Obuttons[i].addActionListener(this);
74
75 display.addActionListener(this);
76 Rbutton.addActionListener(this);
77 setSize(8000??8000);//don't use ???
78
79 setVisible(true);//???
80 //???????С
81 setResizable(false);
82 //?????????
83 pack();
84 }
85
86 //??????????performed????
87 public void actionPerformed(ActionEvent e) {
88 Object happen = e.getSource();
89 //
90 String label = e.getActionCommand();
91
92 if ("+-*/".indexOf(label) >= 0)
93 getOperator(label);
94 else if (label == "OK")
95 getEnd(label);
96 else if ("reset".indexOf(label) >= 0)
97 // display.setText("reset");
98 resetAll(label);
99 }
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