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NirmalSilwalNirmalSilwal
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program having all implementation logic of calculator
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‎Calculator.java

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package calculator;
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import java.awt.Color;
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import java.awt.Dimension;
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import java.awt.Font;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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import javax.swing.BorderFactory;
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import javax.swing.ImageIcon;
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import javax.swing.JButton;
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import javax.swing.JFrame;
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import javax.swing.JPanel;
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import javax.swing.JTextArea;
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import javax.swing.border.Border;
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public class Calculator implements ActionListener{
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JFrame frame = new JFrame();
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JPanel panel = new JPanel();
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JTextArea textarea = new JTextArea(2,10);
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//now add 17 buttons in calculator
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JButton button1 = new JButton();
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JButton button2 = new JButton();
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JButton button3 = new JButton();
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JButton button4 = new JButton();
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JButton button5 = new JButton();
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JButton button6 = new JButton();
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JButton button7 = new JButton();
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JButton button8 = new JButton();
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JButton button9 = new JButton();
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JButton button0 = new JButton();
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JButton buttonAdd = new JButton();
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JButton buttonSub = new JButton();
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JButton buttonMul = new JButton();
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JButton buttonDiv = new JButton();
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JButton buttonDot = new JButton();
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JButton buttonEqual = new JButton();
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JButton buttonClear = new JButton();
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double num1,num2,result;
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int addc=0,subc=0,mulc=0,divc=0;
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public Calculator()
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{
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frame.setSize(350,450);
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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frame.setVisible(true);//makes the frame visible
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frame.setTitle("NIRMAL CALCULATOR");
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frame.add(panel);
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//we add the panel in the frame
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panel.setBackground(Color.LIGHT_GRAY);
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//LIGHT GRAY is the background color of the panel
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Border border = BorderFactory.createLineBorder(Color.RED,4);
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//RED is the color of the border and 4 is the size of the border; we make the object of the Border class
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panel.setBorder(border);
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panel.add(textarea);
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textarea.setBackground(Color.BLACK);
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Border tborder = BorderFactory.createLineBorder(Color.BLUE,3);
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textarea.setBorder(tborder);
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Font font = new Font("arial",Font.BOLD,35);
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textarea.setFont(font);
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textarea.setForeground(Color.WHITE);
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textarea.setPreferredSize(new Dimension(2,10));
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textarea.setLineWrap(true);
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//now adjust the dimensions of the buttons
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//then add icons of 17 buttons from their respective locations
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button1.setPreferredSize(new Dimension(100,43));
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button1.setIcon(new ImageIcon("E:\\java projects\\calcButn\\1.jpg"));
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button2.setPreferredSize(new Dimension(100,43));
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button2.setIcon(new ImageIcon("E:\\java projects\\calcButn\\2.jpg"));
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button3.setPreferredSize(new Dimension(100,43));
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button3.setIcon(new ImageIcon("E:\\java projects\\calcButn\\3.jpg"));
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button4.setPreferredSize(new Dimension(100,43));
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button4.setIcon(new ImageIcon("E:\\java projects\\calcButn\\4.jpg"));
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button5.setPreferredSize(new Dimension(100,43));
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button5.setIcon(new ImageIcon("E:\\java projects\\calcButn\\5.jpg"));
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button6.setPreferredSize(new Dimension(100,43));
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button6.setIcon(new ImageIcon("E:\\java projects\\calcButn\\6.jpg"));
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button7.setPreferredSize(new Dimension(100,43));
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button7.setIcon(new ImageIcon("E:\\java projects\\calcButn\\7.jpg"));
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button8.setPreferredSize(new Dimension(100,43));
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button8.setIcon(new ImageIcon("E:\\java projects\\calcButn\\8.jpg"));
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button9.setPreferredSize(new Dimension(100,43));
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button9.setIcon(new ImageIcon("E:\\java projects\\calcButn\\9.jpg"));
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button0.setPreferredSize(new Dimension(100,43));
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button0.setIcon(new ImageIcon("E:\\java projects\\calcButn\\0.jpg"));
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buttonAdd.setPreferredSize(new Dimension(100,43));
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buttonAdd.setIcon(new ImageIcon("E:\\java projects\\calcButn\\adds.jpg"));
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buttonSub.setPreferredSize(new Dimension(100,43));
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buttonSub.setIcon(new ImageIcon("E:\\java projects\\calcButn\\sub.jpg"));
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buttonMul.setPreferredSize(new Dimension(100,43));
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buttonMul.setIcon(new ImageIcon("E:\\java projects\\calcButn\\mul.jpg"));
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buttonDiv.setPreferredSize(new Dimension(100,43));
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buttonDiv.setIcon(new ImageIcon("E:\\java projects\\calcButn\\div.jpg"));
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buttonDot.setPreferredSize(new Dimension(100,43));
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buttonDot.setIcon(new ImageIcon("E:\\java projects\\calcButn\\dot.jpg"));
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buttonEqual.setPreferredSize(new Dimension(200,56));
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buttonEqual.setIcon(new ImageIcon("E:\\java projects\\calcButn\\==.jpg"));
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buttonClear.setPreferredSize(new Dimension(100,56));
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buttonClear.setIcon(new ImageIcon("E:\\java projects\\calcButn\\Clear.jpg"));
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//now add those 17 buttons in the panel of the JFrame
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panel.add(button1);
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panel.add(button2);
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panel.add(button3);
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panel.add(button4);
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panel.add(button5);
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panel.add(button6);
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panel.add(button7);
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panel.add(button8);
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panel.add(button9);
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panel.add(button0);
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panel.add(buttonAdd);
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panel.add(buttonSub);
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panel.add(buttonMul);
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panel.add(buttonDiv);
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panel.add(buttonDot);
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panel.add(buttonEqual);
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panel.add(buttonClear);
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//now add action listener for each buttons
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button1.addActionListener(this);
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button2.addActionListener(this);
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button3.addActionListener(this);
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button4.addActionListener(this);
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button5.addActionListener(this);
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button6.addActionListener(this);
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button7.addActionListener(this);
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button8.addActionListener(this);
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button9.addActionListener(this);
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button0.addActionListener(this);
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buttonAdd.addActionListener(this);
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buttonSub.addActionListener(this);
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buttonMul.addActionListener(this);
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buttonDiv.addActionListener(this);
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buttonDot.addActionListener(this);
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buttonEqual.addActionListener(this);
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buttonClear.addActionListener(this);
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}
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@Override
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public void actionPerformed(ActionEvent e)
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{
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//firstly make the object of Object class named source here
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Object source = e.getSource();
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//now add respective actions of each buttons
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if(source==buttonClear)
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{
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//this will CLEAR the screen
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num1=0.0;
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num2=0.0;
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textarea.setText("");
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}
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if(source==button1){
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textarea.append("1");
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}
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if(source==button2){
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textarea.append("2");
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}
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if(source==button3){
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textarea.append("3");
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}
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if(source==button4){
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textarea.append("4");
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}
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if(source==button5){
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textarea.append("5");
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}
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if(source==button6){
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textarea.append("6");
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}
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if(source==button7){
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textarea.append("7");
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}
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if(source==button8){
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textarea.append("8");
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}
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if(source==button9){
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textarea.append("9");
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}
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if(source==button0){
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textarea.append("0");
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}
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if(source==buttonDot){
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textarea.append(".");
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}
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if(source==buttonAdd){
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num1 = number_reader();
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textarea.setText("");
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//textarea.append("+");
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addc=1;
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subc=0;
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mulc=0;
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divc=0;
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}
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if(source==buttonSub){
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num1 = number_reader();
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textarea.setText("");
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//textarea.append("-");
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subc=1;
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addc=0;
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mulc=0;
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divc=0;
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}
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if(source==buttonMul){
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num1 = number_reader();
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textarea.setText("");
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//textarea.append("*");
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mulc=1;
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addc=0;
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subc=0;
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divc=0;
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}
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if(source==buttonDiv){
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num1 = number_reader();
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textarea.setText("");
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//textarea.append("/");
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divc = 1;
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addc=0;
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subc=0;
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mulc=0;
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}
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//now if user press EQUAL SIGN(=) to get result perform following action
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if(source==buttonEqual)
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{
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//first read number2 before performing any operation
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num2 = number_reader();
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if(addc>0){
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//to do addition
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result = num1 + num2;
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textarea.setText(Double.toString(result));
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}
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if(subc>0){
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//to do subtraction
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result = num1 - num2;
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textarea.setText(Double.toString(result));
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}
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if(mulc>0){
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//to do multiplication
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result = num1 * num2;
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textarea.setText(Double.toString(result));
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}
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if(divc>0){
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//for performing division operation
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result = num1/num2;
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textarea.setText(Double.toString(result));
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}
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}
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}
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//this number_reader method will convert the received string format input i.e 1,2... into number format
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//to display in screen and returns that number
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public double number_reader(){
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double num1;
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String s;
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s = textarea.getText();
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num1 = Double.valueOf(s);
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return num1;
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}
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}

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