Swing is a GUI widget toolkit for Java. It is part of Oracle's Java Foundation Classes – an API for providing a graphical user interface for Java programs. Swing was developed to provide a more sophisticated set of GUI components than the earlier Abstract Window Toolkit (AWT).
We will performed four type of arithmetic operation like Addition(+) , Subtraction(-) , Multiplication (*) , Division(/).
In this we will use some java swing components , Listener Interface , Event , Methods Etc. to create a simple calculator (With Validation).
The following is a list of which methods, which interfaces, which events we will use in this :
- setText() : Defines the single line of text this component will display. If the value of text is null or empty string, nothing is displayed.
- getText() : returns the text from the single-line text field.
- setFont() : sets the font and style when displaying text strings.
- setToolTipText() : sets the tooltip of the component to the specified string s. Use : When the cursor enters the boundary of that component a popup appears and text is displayed.
- setBounds(): set the position and size of any component.
- add() : add a component on another component or JFrame.
- setCursor() : sets a mouse cursor shape like hand pointer,Text Pointer,Help Pointer Etc. The hand cursor is mostly used.
- setBackground() : used to change the color of various objects.
- setLocation(): Sets the location of the point to the specified location.
- setLayout() : sets the layout manager for the component.
- setResizable(): Indicates whether this frame is resizable by the user. By default, all frames are initially resizable. return : true if the user can resize this frame; false otherwise.
- setVisible() : sets the visibility of the component or JFrame. It is by default false.
- setTitle() : Sets the title for this frame to the specified string.
First of all create your project and inside a project create one JFrame Form.
To create JFrame form right click on your com.company packages > New > Swing GUI Designer > GUI Form.
Give your form name.
Code for create simple calculator with validation :
package com.company;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class calculator {
// JFrame compponents declraions start here :
JFrame frame = new JFrame("calculator");
JLabel jLabel1 = new JLabel();
JLabel jLabel2 = new JLabel();
JTextField jTextField1 = new JTextField();
JTextField jTextField2 = new JTextField();
JLabel jLabel3 = new JLabel();
JButton exit = new JButton();
JButton clear = new JButton();
JButton subtraction = new JButton();
JButton multiplication = new JButton();
JButton division = new JButton();
JButton addition = new JButton();
//Create a constructor
calculator(){
//Label 1 for first value
jLabel1.setFont(new Font("Segoe UI", 1, 24));
jLabel1.setText("First Value :");
frame.add(jLabel1);
jLabel1.setBounds(280, 31, 140, 34);
//Label 2 for Second value
jLabel2.setFont(new Font("Segoe UI", 1, 24));
jLabel2.setText("Second Value :");
frame.add(jLabel2);
jLabel2.setBounds(280, 78, 164, 34);
//JTextField 1 for first value
jTextField1.setFont(new Font("Segoe UI", 1, 24));
jTextField1.setToolTipText("Enter First Value Here");
jTextField1.setName("txtn1");
frame.add(jTextField1);
jTextField1.setBounds(495, 31, 220, 40);
//JTextField 2 for first value
jTextField2.setFont(new Font("Segoe UI", 1, 24));
jTextField2.setToolTipText("Enter Second Value Here");
jTextField2.setName("txtn2");
frame.add(jTextField2);
jTextField2.setBounds(495, 88, 220, 40);
//Label 3 for displaying answer or errors
jLabel3.setFont(new Font("Segoe UI", 1, 24));
frame.add(jLabel3);
jLabel3.setBounds(370, 238, 420, 34);
//exit button for exit the form
exit.setBackground(new Color(153, 204, 255));
exit.setFont(new Font("Segoe UI", 1, 24));
exit.setText("Exit");
exit.setToolTipText("Exit");
exit.setCursor(new Cursor(Cursor.HAND_CURSOR));
exit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
frame.dispose();
}
});
frame.add(exit);
exit.setBounds(789, 161, 80, 41);
//clear button for clear the jTextField text
clear.setBackground(new Color(153, 204, 255));
clear.setFont(new Font("Segoe UI", 1, 24));
clear.setText("Clear");
clear.setToolTipText("Clear");
clear.setCursor(new Cursor(Cursor.HAND_CURSOR));
clear.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
jTextField1.requestFocus();
jTextField1.setText("");
jTextField2.setText("");
jLabel3.setText("");
jTextField1.setBackground(Color.white);
jTextField2.setBackground(Color.white);
}
});
frame.add(clear);
clear.setBounds(680, 161, 94, 41);
//Arithmetic operations start here
//1.Subtraction(-) :
subtraction.setBackground(new Color(153, 204, 255));
subtraction.setFont(new Font("Segoe UI", 1, 24));
subtraction.setText("Subtraction");
subtraction.setToolTipText("Subtraction");
subtraction.setCursor(new Cursor(Cursor.HAND_CURSOR));
subtraction.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int n1=0;
int n2=0;
if(!jTextField1.getText().equals("")){
n1 = Integer.parseInt(jTextField1.getText());
jTextField1.setBackground(Color.white);
}
else{
jTextField1.setBackground(Color.red);
}
if(!jTextField2.getText().equals("")){
n2 = Integer.parseInt(jTextField2.getText());
jTextField2.setBackground(Color.white);
}
else{
jTextField2.setBackground(Color.red);
}
//Addtion operation start here
if(!jTextField1.getText().equals("")&&!(jTextField2.getText().equals(""))){
int ans = n1 - n2;
jLabel3.setText("Your Ans Is : "+jTextField1.getText()+" - "+jTextField2.getText()+" = "+ans);
}else{
jLabel3.setText("Required to be entering both values");
}
}
});
frame.add(subtraction);
subtraction.setBounds(153, 161, 169, 41);
//2.Multiplication(*) :
multiplication.setBackground(new Color(153, 204, 255));
multiplication.setFont(new Font("Segoe UI", 1, 24));
multiplication.setText("Multiplication");
multiplication.setToolTipText("multiplication");
multiplication.setCursor(new Cursor(Cursor.HAND_CURSOR));
multiplication.addActionListener(new ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
int n1=0;
int n2=0;
if(!jTextField1.getText().equals("")){
n1 = Integer.parseInt(jTextField1.getText());
jTextField1.setBackground(Color.white);
}
else{
jTextField1.setBackground(Color.red);
}
if(!jTextField2.getText().equals("")){
n2 = Integer.parseInt(jTextField2.getText());
jTextField2.setBackground(Color.white);
}
else{
jTextField2.setBackground(Color.red);
}
//Addtion operation start here
if(!jTextField1.getText().equals("")&&!(jTextField2.getText().equals(""))){
int ans = n1 * n2;
jLabel3.setText("Your Ans Is : "+jTextField1.getText()+" X "+jTextField2.getText()+" = "+ans);
}else{
jLabel3.setText("Required to be entering both values");
}
}
});
frame.add(multiplication);
multiplication.setBounds(335, 161, 195, 41);
//3.Division(/) :
division.setBackground(new Color(153, 204, 255));
division.setFont(new Font("Segoe UI", 1, 24));
division.setText("Division");
division.setToolTipText("division");
division.setCursor(new Cursor(java.awt.Cursor.HAND_CURSOR));
division.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int n1=0;
int n2=0;
if(!jTextField1.getText().equals("")){
n1 = Integer.parseInt(jTextField1.getText());
jTextField1.setBackground(Color.white);
}
else{
jTextField1.setBackground(Color.red);
}
if(!jTextField2.getText().equals("")){
n2 = Integer.parseInt(jTextField2.getText());
jTextField2.setBackground(Color.white);
}
else{
jTextField2.setBackground(Color.red);
}
//Addtion operation start here
try{
if(!jTextField1.getText().equals("")&&!(jTextField2.getText().equals(""))){
int ans = n1 / n2;
jLabel3.setText("Your Ans Is : "+jTextField1.getText()+" / "+jTextField2.getText()+" = "+ans);
}else{
jLabel3.setText("Required to be entering both values");
}
}catch(Exception e){
jLabel3.setText(jTextField1.getText()+" is cannot divided by zero");
}
}
});
frame.add(division);
division.setBounds(546, 161, 125, 41);
//4.Addition(+) :
addition.setBackground(new Color(153, 204, 255));
addition.setFont(new Font("Segoe UI", 1, 24));
addition.setText("Addtion");
addition.setToolTipText("addition");
addition.setCursor(new Cursor(Cursor.HAND_CURSOR));
addition.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int n1=0;
int n2=0;
if(!jTextField1.getText().equals("")){
n1 = Integer.parseInt(jTextField1.getText());
jTextField1.setBackground(Color.white);
}
else{
jTextField1.setBackground(Color.red);
}
if(!jTextField2.getText().equals("")){
n2 = Integer.parseInt(jTextField2.getText());
jTextField2.setBackground(Color.white);
}
else{
jTextField2.setBackground(Color.red);
}
//Addtion operation start here
if(!jTextField1.getText().equals("")&&!(jTextField2.getText().equals(""))){
int ans = n1 + n2;
jLabel3.setText("Your Ans Is : "+jTextField1.getText()+" + "+jTextField2.getText()+" = "+ans);
}else{
jLabel3.setText("Required to be entering both values");
}
}
});
frame.add(addition);
addition.setBounds(15, 161, 130, 41);
//Define Some JFrame Properties :
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("Calculator");
frame.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
frame.setLocation(450, 200);
frame.setSize(950,400);
frame.getContentPane().setBackground(new Color(153, 170, 255, 255));
frame.setLayout(null);
frame.setResizable(false);
frame.setVisible(true);
}
public static void main(String[] args) {
new calculator();
}
}Output:
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