Develop a simple calculator using Swings in JAVA

Programs: Develop a simple calculator using Swings.

Aim: Introduce java Applet, awt, and swings.

Program:-

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
class Calculator implements ActionListener
{
JFrame frame; //Creating object ofJFrame class
JTextField t;
JButton b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,bdot,badd,bmul,bsub,bdiv,beq,bclr;
static double a=0,b=0,res=0;
static int op=0;
public void Display()
{
frame=new JFrame();
frame.setTitle("IUK Calculator"); //Title of the JFrame
frame.setSize(225,300); //Calculator Size
frame.setLayout(null); //Setting Layout
frame.setBackground(Color.black); //Setting Background Color
frame.setResizable(true); //window resizing
frame.setVisible(true); //Setting window's visibility
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//Setting default close
operation
t=new JTextField();
t.setBounds(30,10,165,35);
b0=new JButton("0");
b0.setBounds(30,50,45,40);
b1=new JButton("1");
b1.setBounds(70,50,45,40);
b2=new JButton("2");
b2.setBounds(110,50,45,40);
b3=new JButton("3");
b3.setBounds(150,50,45,40);
b4=new JButton("4");
b4.setBounds(30,90,45,40);
b5=new JButton("5");
b5.setBounds(70,90,45,40);
b6=new JButton("6");
b6.setBounds(110,90,45,40);
b7=new JButton("7");
b7.setBounds(150,90,45,40);
b8=new JButton("8");
b8.setBounds(30,130,45,40);
b9=new JButton("9");
b9.setBounds(70,130,45,40);
bdot=new JButton(".");
bdot.setBounds(110,130,45,40);
badd=new JButton("+");
badd.setBounds(150,130,45,40);
bsub=new JButton("-");

bsub.setBounds(30,170,45,40);
bmul=new JButton("*");
bmul.setBounds(70,170,45,40);
bdiv=new JButton("/");
bdiv.setBounds(110,170,45,40);
beq=new JButton("=");
beq.setBounds(150,170,45,40);
bclr=new JButton("CLR");
bclr.setBounds(30,210,165,40);
frame.add(t);
frame.add(b0);
frame.add(b1);
frame.add(b2);
frame.add(b3);
frame.add(b4);
frame.add(b5);
frame.add(b6);
frame.add(b7);
frame.add(b8);
frame.add(b9);
frame.add(bdot);
frame.add(badd);
frame.add(bsub);
frame.add(bmul);
frame.add(bdiv);
frame.add(beq);
frame.add(bclr);
b0.addActionListener(this);
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);
b5.addActionListener(this);
b6.addActionListener(this);
b7.addActionListener(this);
b8.addActionListener(this);
b9.addActionListener(this);
badd.addActionListener(this);
bsub.addActionListener(this);
bmul.addActionListener(this);
bdiv.addActionListener(this);
bdot.addActionListener(this);
beq.addActionListener(this);
bclr.addActionListener(this);
}

public void actionPerformed(ActionEvent e)
{
if(e.getSource()==bclr)
{
t.setText("");
}
if(e.getSource()==b0)
{
t.setText(t.getText().concat("0"));
}
if(e.getSource()==b1)
{
t.setText(t.getText().concat("1"));
}
if(e.getSource()==b2)
{
t.setText(t.getText().concat("2"));
}
if(e.getSource()==b3)
{
t.setText(t.getText().concat("3"));
}
if(e.getSource()==b4)
{
t.setText(t.getText().concat("4"));
}
if(e.getSource()==b5)
{
t.setText(t.getText().concat("5"));
}
if(e.getSource()==b6)
{
t.setText(t.getText().concat("6"));
}
if(e.getSource()==b7)
{
t.setText(t.getText().concat("7"));
}
if(e.getSource()==b8)
{
t.setText(t.getText().concat("8"));
}
if(e.getSource()==b9)
{
t.setText(t.getText().concat("9"));
}
if(e.getSource()==bdot)
{
t.setText(t.getText().concat("."));
}
if(e.getSource()==badd)
{
a=Double.parseDouble(t.getText());
op=1;
t.setText("");
}
if(e.getSource()==bsub)
{
a=Double.parseDouble(t.getText());
op=2;
t.setText("");
}
if(e.getSource()==bmul)
{
a=Double.parseDouble(t.getText());
op=3;
t.setText("");
}
if(e.getSource()==bdiv)
{
a=Double.parseDouble(t.getText());
op=4;
t.setText("");
}
if(e.getSource()==beq)
{
b=Double.parseDouble(t.getText());
switch(op)
{
case 1:res=a+b;
break;
case 2:res=a-b;
break;
case 3:res=a*b;
break;
case 4:res=a/b;
break;
}
t.setText(""+res);
}
}
}
public class CalculatorP
{
public static void main(String[] args)
{
Calculator obj=new Calculator();
obj.Display();
}
}

Output:-