Find Intrest using swing

				
//**************************************
// Name: Find Intrest using swing
// Description:simple appln using swing which count simple intrest
// By: jatin contractor
//
// Inputs:we have to input amount,rate,& year,
//
// Returns:returns the answer by using formula of smiple intrest (amt*rate/year)*100
//
//This code is copyrighted and has// limited warranties.Please see http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=5468&lngWId=2//for details.//**************************************

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class FindInterest
{
	public static void main(String args[])
	{
		Interest i=new Interest();
		i.init();
		i.setVisible(true);
	}
}
class Interest extends JFrame implements ActionListener
{
	JPanel a,i,y,r,b,all;
	JLabel am,it,yr,rt;
	JTextField amt,itr,yrs,rate;
	JButton cal,clr;
	float amount,years,rate_in,interest;
	public Interest()
	{
		setTitle("Find Interest");
		setSize(500,400);
		setLocation(200,200);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		a=new JPanel();
		i=new JPanel();
		y=new JPanel();
		r=new JPanel();
		b=new JPanel();
		all=new JPanel(new FlowLayout(FlowLayout.CENTER,1000,20));
		am=new JLabel("Enter Amount");
		it=new JLabel("Interest is");
		yr=new JLabel("Enter Years");
		rt=new JLabel("Enter rate");
		amt=new JTextField(10);
		itr=new JTextField(10);
		itr.setEditable(false);
		yrs=new JTextField(10);
		rate=new JTextField(10);
		cal=new JButton("Calculate");
		clr=new JButton("Clear");
	}
	public void init()
	{
		setLayout(new BorderLayout());
		a.add(am);
		a.add(amt);
		y.add(yr);
		y.add(yrs);
		r.add(rt);
		r.add(rate);
		i.add(it);
		i.add(itr);
		b.add(cal);
		b.add(clr);
		all.add(a);
		all.add(y);
		all.add(r);
		all.add(i);
		add(b,BorderLayout.SOUTH);
		add(all,BorderLayout.CENTER);
		cal.addActionListener(this);
		clr.addActionListener(this);
	}
	public void actionPerformed(ActionEvent e)
	{
		try
		{
			if(cal==e.getSource())
			{
				amount=Float.parseFloat(amt.getText());
				years=Float.parseFloat(yrs.getText());
				rate_in=Float.parseFloat(rate.getText());
				interest=amount*years*rate_in/100;
				itr.setText(Float.toString(interest));
			}
			else if(clr==e.getSource())
			{
				amt.setText("");
				yrs.setText("");
				rate.setText("");
				itr.setText("");
			}
		}
		catch(NumberFormatException n)
		{
			amt.setText("0");
			yrs.setText("0");
			rate.setText("0");
			itr.setText("0");
		}
	}
}