SY-9-a Java AWT program to print the factorial for an input value in easy way

 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

import java.awt.*;
import java.awt.event.*;

class Factorial extends Frame implements ActionListener
{
	TextField tf;
	Button b;
	Label n, l, r;
	Factorial()
	{  
		n = new Label("AWT Factorial Program");
		l = new Label("Enter number");
		r = new Label();

		tf = new TextField();

		b = new Button("Factorial");  
//itvoyagers.in
		n.setBounds(30, 40, 200, 20);
		l.setBounds(30, 70, 150, 20);
		r.setBounds(30, 170, 200, 20);

		tf.setBounds(30, 90, 190, 30);

		b.setBounds(30, 130, 190, 30);  

		add(n);
		add(l);
		add(r);
		add(tf);
		add(b);

		setSize(250,210);
		setLayout(null);//no layout manager  
		setVisible(true);//now frame will be visible, by default not visible  

		b.addActionListener(this);

		addWindowListener(new WindowAdapter()
		{  
            public void windowClosing(WindowEvent e)
            {  
                dispose();  
            }  
        });
	}
//itvoyagers.in
	public void actionPerformed(ActionEvent e)
	{
		if(e.getSource()==b)
		{
			int num = Integer.parseInt(tf.getText());
			r.setText("Factorial of "+num+" is "+getFactorial(num));
		}
	}

	public int getFactorial(int x)
	{
		int rsl = 1;
		for(int i = x; i > 0; --i)
		{
			rsl *= i;
		}
		return(rsl);
	}
//itvoyagers.in
	public static void main(String[] args)
	{
		Factorial factorial = new Factorial();
	}
}