Calculator Using GUI
********************************
package com.company;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class GUI_calculator implements ActionListener {
float first=0;
float second=0;
float third=0;
private JFrame frame;
private JPanel panel;
private JButton b;
private JButton b1;
private JButton b2;
private JButton b3;
private JButton b4;
private JButton b5;
private JButton b6;
private JButton b7;
private JLabel label;
private JLabel label1;
private JLabel label2;
public GUI_calculator(){
frame=new JFrame();
label=new JLabel("0");
b=new JButton("++");
b1=new JButton("+");
b2=new JButton("-");
b3=new JButton("*");
b4=new JButton("/");
label1=new JLabel("0");
b5=new JButton("++");
b6=new JButton("=");
b7=new JButton("C");
label2=new JLabel("0");
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);
b.addActionListener(this);
b5.addActionListener(this);
b6.addActionListener(this);
b7.addActionListener(this);
//Panel Content
panel=new JPanel();
panel.setBorder(BorderFactory.createEmptyBorder(30,30,10,30));
panel.add(label);
panel.add(b);
panel.add(label1);
panel.add(b5);
panel.add(b7);
panel.add(b1);
panel.add(b2);
panel.add(b3);
panel.add(b4);
panel.add(b6);
panel.add(label2);
panel.setLayout(new GridLayout(0,1));
frame.add(panel,BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("Calculator");
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
new GUI_calculator();
}
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource()==b){
first++;
label.setText(""+first);
}
else { }
if (e.getSource()==b5){
second++;
label1.setText(""+second);
}
else { }
if (e.getSource()==b1){
third=first+second;
}
else if (e.getSource()==b2){
third=first-second;
}
else if (e.getSource()==b3){
third=first*second;
}
else if (e.getSource()==b4){
third=first/second;
}
else if (e.getSource()==b7){
first=0;
second=0;
label1.setText(""+second);
label.setText(""+first);
}
if (e.getSource()==b6){
label2.setText(""+third);
}
}
}
