Arithmetic Operation using JOptionPane

Program Description:

The program below is a simple java code arithmetic operation using JButton as arithmetic operator selector and JOptionPane as user input. It is also capable of catching number format error like putting non-integer numbers.

Output:

Code:

/**

 * File: arithmeticOperationJOptionPane.java

 * Tiltle: Arithmetic Operation using JOptionPane

 * Author: http://java-code-complete.blogspot.com/

 */



//Java Core Package

import javax.swing.*;

//Java Extension Package

import java.awt.*;

import java.awt.event.*;



public class arithmeticOperationJOptionPane extends JFrame {

	

	//Initializing JButton and String operation as the label of each JButton

	private JButton buttons[];

	private String operation[] = {"Addition [+]","Subtraction [-]","Multiplication [x]","Division [/]"};



	//Setting up GUI

    public arithmeticOperationJOptionPane() {

    	

    	//Setting up the Title of the Window

    	super("Arithmetic Operation using JOptionPane");



    	//Set Size of the Window (WIDTH, HEIGHT)

    	setSize(320,120);



    	//Exit Property of the Window

    	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    	

    	//Constructing JButton with a array size of 4

    	buttons = new JButton[4];

    	

    	//Setting up the container ready for the components to be added.

    	Container pane = getContentPane();

    	setContentPane(pane);



    	//Setting up the container layout

    	GridLayout grid = new GridLayout(2,2);

    	pane.setLayout(grid);

    	

    	//Constructing all 4 JButtons using "for loop" and add them in the container

    	for(int count=0; count<buttons.length; count++) {

    		buttons[count] = new JButton(operation[count]);

    		pane.add(buttons[count]);

    	}

		

		//Implemeting Even-Listener on JButton button[0] which is addition

		buttons[0].addActionListener(

		new ActionListener() {

			

			//Handle JButton event if it is clicked

			public void actionPerformed(ActionEvent event) {

				try { //fetch an error using "try-catch" function.

				

				//Initializing important variables for operation

				String input1, input2;

				int num1, num2, result;

				

				//Making two JOptionPane inputs

				input1 = JOptionPane.showInputDialog("Please Input First Number: ");

				input2 = JOptionPane.showInputDialog("Please Input Second Number: ");

				

				//Converting the inputs to integer in order to do the Arithmetic operation by parsing the inputs.

				num1 = Integer.parseInt(input1);

				num2 = Integer.parseInt(input2);

				

				//Processing Arithmetic Operation

				result = num1 + num2;

				

				//Display the result using JOptionPane

				JOptionPane.showMessageDialog(null,result,"Result:",JOptionPane.INFORMATION_MESSAGE);

				} catch (NumberFormatException e){ //Catch the error if the user inputs a non-integer value

				

						//Display the error

						JOptionPane.showMessageDialog(null, "Please Input a Integer","Error",JOptionPane.ERROR_MESSAGE);

				}

			}

		}

		);

		

		//Implemeting Even-Listener on JButton button[1] which is subtraction

		buttons[1].addActionListener(

		new ActionListener() {

			

			//Handle JButton event if it is clicked

			public void actionPerformed(ActionEvent event) {

				try {

				String input1, input2;

				int num1, num2, result;

				

				input1 = JOptionPane.showInputDialog("Please Input First Number: ");

				input2 = JOptionPane.showInputDialog("Please Input Second Number: ");

				

				num1 = Integer.parseInt(input1);

				num2 = Integer.parseInt(input2);

				

				result = num1 - num2;

				

				JOptionPane.showMessageDialog(null,result,"Result:",JOptionPane.INFORMATION_MESSAGE);

				} catch (NumberFormatException e){

						JOptionPane.showMessageDialog(null, "Please Input a Integer","Error",JOptionPane.ERROR_MESSAGE);



				}

			}

		}

		);

		

		//Implemeting Even-Listener on JButton button[2] which is multiplication

		buttons[2].addActionListener(

		new ActionListener() {

			

			//Handle JButton event if it is clicked

			public void actionPerformed(ActionEvent event) {

				try {

				String input1, input2;

				int num1, num2, result;

				

				input1 = JOptionPane.showInputDialog("Please Input First Number: ");

				input2 = JOptionPane.showInputDialog("Please Input Second Number: ");

				

				num1 = Integer.parseInt(input1);

				num2 = Integer.parseInt(input2);

				

				result = num1 * num2;

				

				JOptionPane.showMessageDialog(null,result,"Result:",JOptionPane.INFORMATION_MESSAGE);

				} catch (NumberFormatException e){

						JOptionPane.showMessageDialog(null, "Please Input a Integer","Error",JOptionPane.ERROR_MESSAGE);



				}

			}

		}

		);

		

		//Implemeting Even-Listener on JButton button[3] which is division

		buttons[3].addActionListener(

		new ActionListener() {

			

			//Handle JButton event if it is clicked

			public void actionPerformed(ActionEvent event) {

				try {

				String input1, input2;

				int num1, num2, result;

				

				input1 = JOptionPane.showInputDialog("Please Input First Number: ");

				input2 = JOptionPane.showInputDialog("Please Input Second Number: ");

				

				num1 = Integer.parseInt(input1);

				num2 = Integer.parseInt(input2);

				

				result = num1 / num2;

				

				JOptionPane.showMessageDialog(null,result,"Result:",JOptionPane.INFORMATION_MESSAGE);

				} catch (NumberFormatException e){

						JOptionPane.showMessageDialog(null, "Please Input a Integer","Error",JOptionPane.ERROR_MESSAGE);



				}

			}

		}

		);

		

		buttons[0].setMnemonic('A');

		buttons[1].setMnemonic('S');

		buttons[2].setMnemonic('M');

		buttons[3].setMnemonic('D');

		

    	/**Set all the Components Visible.

    	 * If it is set to "false", the components in the container will not be visible.

    	 */

    	setVisible(true);

    	setResizable(false); //Fix window height and width

    }

    

	//Main Method

    public static void main (String[] args) {

    	arithmeticOperationJOptionPane pjtf = new arithmeticOperationJOptionPane();

	}

}

Important Part of the Program:

//Constructing all 4 JButtons using "for loop" and add them in the container

    	for(int count=0; count<buttons.length; count++) {

    		buttons[count] = new JButton(operation[count]);

    		pane.add(buttons[count]);

    	}

		

		//Implemeting Even-Listener on JButton button[0] which is addition

		buttons[0].addActionListener(

		new ActionListener() {

			

			//Handle JButton event if it is clicked

			public void actionPerformed(ActionEvent event) {

				try { //fetch an error using "try-catch" function.

				

				//Initializing important variables for operation

				String input1, input2;

				int num1, num2, result;

				

				//Making two JOptionPane inputs

				input1 = JOptionPane.showInputDialog("Please Input First Number: ");

				input2 = JOptionPane.showInputDialog("Please Input Second Number: ");

				

				//Converting the inputs to integer in order to do the Arithmetic operation by parsing the inputs.

				num1 = Integer.parseInt(input1);

				num2 = Integer.parseInt(input2);

				

				//Processing Arithmetic Operation

				result = num1 + num2;

				

				//Display the result using JOptionPane

				JOptionPane.showMessageDialog(null,result,"Result:",JOptionPane.INFORMATION_MESSAGE);

				} catch (NumberFormatException e){ //Catch the error if the user inputs a non-integer value

				

						//Display the error

						JOptionPane.showMessageDialog(null, "Please Input a Integer","Error",JOptionPane.ERROR_MESSAGE);

				}

			}

		}

		);

		

		//Implemeting Even-Listener on JButton button[1] which is subtraction

		buttons[1].addActionListener(

		new ActionListener() {

			

			//Handle JButton event if it is clicked

			public void actionPerformed(ActionEvent event) {

				try {

				String input1, input2;

				int num1, num2, result;

				

				input1 = JOptionPane.showInputDialog("Please Input First Number: ");

				input2 = JOptionPane.showInputDialog("Please Input Second Number: ");

				

				num1 = Integer.parseInt(input1);

				num2 = Integer.parseInt(input2);

				

				result = num1 - num2;

				

				JOptionPane.showMessageDialog(null,result,"Result:",JOptionPane.INFORMATION_MESSAGE);

				} catch (NumberFormatException e){

						JOptionPane.showMessageDialog(null, "Please Input a Integer","Error",JOptionPane.ERROR_MESSAGE);



				}

			}

		}

		);

		

		//Implemeting Even-Listener on JButton button[2] which is multiplication

		buttons[2].addActionListener(

		new ActionListener() {

			

			//Handle JButton event if it is clicked

			public void actionPerformed(ActionEvent event) {

				try {

				String input1, input2;

				int num1, num2, result;

				

				input1 = JOptionPane.showInputDialog("Please Input First Number: ");

				input2 = JOptionPane.showInputDialog("Please Input Second Number: ");

				

				num1 = Integer.parseInt(input1);

				num2 = Integer.parseInt(input2);

				

				result = num1 * num2;

				

				JOptionPane.showMessageDialog(null,result,"Result:",JOptionPane.INFORMATION_MESSAGE);

				} catch (NumberFormatException e){

						JOptionPane.showMessageDialog(null, "Please Input a Integer","Error",JOptionPane.ERROR_MESSAGE);



				}

			}

		}

		);

		

		//Implemeting Even-Listener on JButton button[3] which is division

		buttons[3].addActionListener(

		new ActionListener() {

			

			//Handle JButton event if it is clicked

			public void actionPerformed(ActionEvent event) {

				try {

				String input1, input2;

				int num1, num2, result;

				

				input1 = JOptionPane.showInputDialog("Please Input First Number: ");

				input2 = JOptionPane.showInputDialog("Please Input Second Number: ");

				

				num1 = Integer.parseInt(input1);

				num2 = Integer.parseInt(input2);

				

				result = num1 / num2;

				

				JOptionPane.showMessageDialog(null,result,"Result:",JOptionPane.INFORMATION_MESSAGE);

				} catch (NumberFormatException e){

						JOptionPane.showMessageDialog(null, "Please Input a Integer","Error",JOptionPane.ERROR_MESSAGE);



				}

			}

		}

		);