Write a Java Program to generate a simple calculator. (WITH OUTPUT IMAGE).

Write a Simple Java Program to generate a simple calculator.

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

/*

<applet code="xyz" width=200 height=300>

</applet>

*/

public class xyz extends java.applet.Applet implements ActionListener

{

            Double cv=0.0,pv=0.0,result=0.0;

            int count=0;

            TextField opd1 = new TextField(10);

        TextField opd2 = new TextField(10);

        TextField oprt = new TextField(1);

            TextField Res = new TextField(10);

            String opr="";

            public void init()

            {          

                        int i=0;

                Button b[] = new Button[17];

                        String a[] = {"0","1","2","3","4","5","6","7","8","9",".","+","-","*","/","=","Clear"};

                        setLayout(new GridLayout(0,4));

                        add(new Label("Operand 1: "));

                add(opd1);

                add(new Label("Operator: "));

                        add(oprt);

                        add(new Label("Operand 2: "));                                               

                add(opd2);

                        add(new Label("Result: "));

                add(Res);

                        opd1.addActionListener(this);

                opd2.addActionListener(this);

                oprt.addActionListener(this);

                        Res.addActionListener(this);

                        //setLayout(new GridLayout(0,3));

                        for(i=0;i<17;i++)

                        {

                                    b[i] = new Button(a[i]);

                                    add(b[i]);

                                    b[i].addActionListener(this);

                        }

                        opd1.setText("");

            }

            public void actionPerformed(ActionEvent ae)

            {                 String s=ae.getActionCommand();

                        if(s.equals("+") || s.equals("-") || s.equals("/") || s.equals("*"))

                        {           count++;

                                    oprt.setText(s);

                                    opd2.setText("");        

                                    opr=s;

                                    pv = Double.parseDouble(opd1.getText());

                        }

                        else if(s.equals("="))

                        {

                                    cv=Double.parseDouble(opd2.getText());

                                    if(opr == "+")

                                    result = pv+cv;

                                    else if(opr == "-")

                                    result = pv-cv;

                                    else if(opr == "*")

                                    result = pv*cv;

                                    else if(opr == "/")

                                    result = pv/cv;

                        }

                        else if(s.equals("Clear"))

                        {

                                    pv=cv=result=0.0;

                                    count=0;

                                    opd1.setText("0");

                                    opd2.setText("0");

                                    //oprt.setText("0");

                        }

                        else

                        {

                                    if(count==0)

                                    opd1.setText(opd1.getText().concat(s));

                                    else

                                    opd2.setText(opd2.getText().concat(s));

                        }

                        Res.setText(String.valueOf(result));  

            }

}

Output: