OOP-using-Java/calculator.java at main · anjly12/OOP-using-Java · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
package calculator;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.event.ActionEvent.*;
import java.awt.event.ActionListener.*;
public class calculator implements ActionListener {
    JTextField t1;
    JButton b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14, b15, b16;
    int n=0,i=0;
    calculator() {
        JFrame f = new JFrame("Calculator");
        JPanel p = new JPanel();
        t1 = new JTextField();
        t1.setBounds(100, 100, 200, 30);
        b1 = new JButton("1");
        b2 = new JButton("2");
        b3 = new JButton("3");
        b4 = new JButton("+");
        b5 = new JButton("4");
        b6 = new JButton("5");
        b7 = new JButton("6");
        b8 = new JButton("-");
        b9 = new JButton("7");
        b10 = new JButton("8");
        b11 = new JButton("9");
        b12 = new JButton("*");
        b13 = new JButton("/");
        b14 = new JButton("0");
        b15 = new JButton("=");
        b16 = new JButton("C");
        b1.setBounds(100, 140, 50, 30);
        b2.setBounds(150, 140, 50, 30);
        b3.setBounds(200, 140, 50, 30);
        b4.setBounds(250, 140, 50, 30);
        b5.setBounds(100, 170, 50, 30);
        b6.setBounds(150, 170, 50, 30);
        b7.setBounds(200, 170, 50, 30);
        b8.setBounds(250, 170, 50, 30);
        b9.setBounds(100, 200, 50, 30);
        b10.setBounds(150, 200, 50, 30);
        b11.setBounds(200, 200, 50, 30);
        b12.setBounds(250, 200, 50, 30);
        b13.setBounds(100, 230, 50, 30);
        b14.setBounds(150, 230, 50, 30);
        b15.setBounds(200, 230, 50, 30);
        b16.setBounds(250, 230, 50, 30);
        p.add(t1);
        p.add(b1);
        p.add(b2);
        p.add(b3);
        p.add(b4);
        p.add(b5);
        p.add(b6);
        p.add(b7);
        p.add(b8);
        p.add(b9);
        p.add(b10);
        p.add(b11);
        p.add(b12);
        p.add(b13);
        p.add(b14);
        p.add(b15);
        p.add(b16);
        b1.addActionListener(this);
        b2.addActionListener(this);
        b3.addActionListener(this);
        b4.addActionListener(this);
        b5.addActionListener(this);
        b6.addActionListener(this);
        b7.addActionListener(this);
        b8.addActionListener(this);
        b9.addActionListener(this);
        b10.addActionListener(this);
        b11.addActionListener(this);
        b12.addActionListener(this);
        b13.addActionListener(this);
        b14.addActionListener(this);
        b15.addActionListener(this);
        b16.addActionListener(this);
        f.setContentPane(p);
        f.setSize(400, 500);
        f.setLayout(null);
        f.setVisible(true);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public static void main(String args[]) {
        new calculator();
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == b1)
            t1.setText(t1.getText() + "1");
        else if (e.getSource() == b2)
            t1.setText(t1.getText() + "2");
        else if (e.getSource() == b3)
            t1.setText(t1.getText() + "3");
        else if (e.getSource() == b5)
            t1.setText(t1.getText() + "4");
        else if (e.getSource() == b6)
            t1.setText(t1.getText() + "5");
        else if (e.getSource() == b7)
            t1.setText(t1.getText() + "6");
        else if (e.getSource() == b9)
            t1.setText(t1.getText() + "7");
        else if (e.getSource() == b10)
            t1.setText(t1.getText() + "8");
        else if (e.getSource() == b11)
            t1.setText(t1.getText() + "9");
        else if (e.getSource() == b14)
            t1.setText(t1.getText() + "0");
        else if (e.getSource() == b4) {
            n = Integer.parseInt(t1.getText());
            t1.setText("");
            i = 1;
        } else if (e.getSource() == b8) {
            n = Integer.parseInt(t1.getText());
            t1.setText("");
            i = 2;
        } else if (e.getSource() == b12) {
            n = Integer.parseInt(t1.getText());
            t1.setText("");
            i = 3;
        } else if (e.getSource() == b13) {
            n = Integer.parseInt(t1.getText());
            t1.setText("");
            i = 4;
        } else if (e.getSource() == b15) {
            calculate();
        } else if (e.getSource() == b16) {
            t1.setText("");
            n = 0;
            i = 0;
        }
    }

    private void calculate() {
        int res = 0;
        int secondOperand;
        try {
            secondOperand = Integer.parseInt(t1.getText());
            switch (i) {
                case 1:
                    res = n + secondOperand;
                    break;
                case 2:
                    res = n - secondOperand;
                    break;
                case 3:
                    res = n * secondOperand;
                    break;
                case 4:
                    if (secondOperand != 0) {
                        res = n / secondOperand;
                    } else {
                        t1.setText("Div by 0!");
                        return;
                    }
                    break;
                default:
                    return;
            }
            t1.setText(Integer.toString(res));
        } catch (NumberFormatException e) {
            t1.setText("Error");
        }
    }
}