A calculator program with java

Step 1:-

Save the file calculator.java

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import java.awt.*;

import java.applet.Applet;

import java.awt.event.*;

public class calculator extends Applet

implements ActionListener

{

        TextField t1,t2,t3;

        Label l1,l2,l3;

        Button b1,b2,b3;

        public void init()

        {

                l1=new Label("1st input");

                add(l1);

                t1=new TextField(20);

                add(t1);

                l2=new Label("2nd input");

                add(l2);

                t2=new TextField(20);

                add(t2);

                l3=new Label("result");

                add(l3);

                t3=new TextField(20);

                add(t3);

                b1=new Button("Add");

                add(b1);

                b1.addActionListener(this);

                b2=new Button("Subtract");

                add(b2);

                b2.addActionListener(this);

                b3=new Button("Multiply");

                add(b3);

                b3.addActionListener(this);

               

        }

        public void actionPerformed(ActionEvent e)

        {       int a=Integer.parseInt(t1.getText());

                int b=Integer.parseInt(t2.getText());

                int c;

                if(e.getSource()==b1)

                {

                      c=a+b;

                      t3.setText(String.valueOf(c));

                }

                if(e.getSource()==b2)

                {

                      c=a-b;

                      t3.setText(String.valueOf(c));

                }

                if(e.getSource()==b3)

                {

                      c=a*b;

                      t3.setText(String.valueOf(c));

                }

               

        }

}

For Compilation type :- javac calculator.java

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Step 2: Html file

Save the file calculator.html

<applet code="calculator.class" width=200 height=200>

</applet>

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Step 3: Output of the program

To run the program type:- appletviewer calculator.java