Java applet program for interest rate calculation

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import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*
<applet code="Loan" width=300 height=300>
</applet>
*/
public class Loan extends Applet
implements ActionListener,ItemListener
{
double p,r,n,total,i;
String param1;
boolean month;
Label l1,l2,l3,l4;
TextField t1,t2,t3,t4;
Button b1,b2;
CheckboxGroup cbg;
Checkbox c1,c2;
String str;
public void init()
{
l1=new Label("Balance Amount",Label.LEFT);
l2=new Label("Number of Months",Label.LEFT);
l3=new Label("Interest Rate",Label.LEFT);
l4=new Label("Total Payment",Label.LEFT);
t1=new TextField(5);
t2=new TextField(5);
t3=new TextField(15);
t4=new TextField(20);
b1=new Button("OK");
b2=new Button("Delete");
cbg=new CheckboxGroup();
c1=new Checkbox("Month Rate",cbg,true);
c2=new Checkbox("Annual Rate",cbg,true);
t1.addActionListener(this);
t2.addActionListener(this);
t3.addActionListener(this);
t4.addActionListener(this);
b1.addActionListener(this);
b2.addActionListener(this);
c1.addItemListener(this);
c2.addItemListener(this);
add(l1);
add(t1);
add(l2);
add(t2);
add(l3);
add(t3);
add(l4);
add(t4);
add(c1);
add(c2);
add(b1);
add(b2);
}
public void itemStateChanged(ItemEvent ie)
{
}
public void actionPerformed(ActionEvent ae)
{
str=ae.getActionCommand();
if(str.equals("OK"))
{
p=Double.parseDouble(t1.getText());
n=Double.parseDouble(t2.getText());
r=Double.parseDouble(t3.getText());
if(c2.getState())
{
n=n/12;
}
i=(p*n*r)/100;
total=p+i;
t4.setText(" "+total);
}
else if(str.equals("Delete"))
{
t1.setText(" ");
t2.setText(" ");
t3.setText(" ");
t4.setText(" ");
}
}
}

import java.awt.*; import java.awt.event.*; import java.applet.*; /* <applet code="Loan" width=300 height=300> </applet> */ public class Loan extends Applet implements ActionListener,ItemListener { double p,r,n,total,i; String param1; boolean month; Label l1,l2,l3,l4; TextField t1,t2,t3,t4; Button b1,b2; CheckboxGroup cbg; Checkbox c1,c2; String str; public void init() { l1=new Label("Balance Amount",Label.LEFT); l2=new Label("Number of Months",Label.LEFT); l3=new Label("Interest Rate",Label.LEFT); l4=new Label("Total Payment",Label.LEFT); t1=new TextField(5); t2=new TextField(5); t3=new TextField(15); t4=new TextField(20); b1=new Button("OK"); b2=new Button("Delete"); cbg=new CheckboxGroup(); c1=new Checkbox("Month Rate",cbg,true); c2=new Checkbox("Annual Rate",cbg,true); t1.addActionListener(this); t2.addActionListener(this); t3.addActionListener(this); t4.addActionListener(this); b1.addActionListener(this); b2.addActionListener(this); c1.addItemListener(this); c2.addItemListener(this); add(l1); add(t1); add(l2); add(t2); add(l3); add(t3); add(l4); add(t4); add(c1); add(c2); add(b1); add(b2); } public void itemStateChanged(ItemEvent ie) { } public void actionPerformed(ActionEvent ae) { str=ae.getActionCommand(); if(str.equals("OK")) { p=Double.parseDouble(t1.getText()); n=Double.parseDouble(t2.getText()); r=Double.parseDouble(t3.getText()); if(c2.getState()) { n=n/12; } i=(p*n*r)/100; total=p+i; t4.setText(" "+total); } else if(str.equals("Delete")) { t1.setText(" "); t2.setText(" "); t3.setText(" "); t4.setText(" "); } } }