CalcMaster using Java.
CalcMaster provides a simple interface for performing math operations, such as addition, subtraction, multiplication, division, and more.
The Java CalcMaster project is a user-friendly application with a graphical interface that emulates a basic calculator's functions such as addition, subtraction, multiplication, and division. The project is built using Java's Swing library to create a cohesive and intuitive GUI.
Project Description:
The project is implemented as a Java application.
It uses the Swing library to create a user-friendly graphical user interface for the calculator.
Code Description:
Initialization:
•Several variables are initialized at the beginning of the code to manage the state of the calculator. These variables include num1, num2, oprClickCount, opr, isOprClick, and isEqualClick.
•These variables are used to keep track of the current numeric values, the operation being performed, and the user's input.
Calculator Operations (calc):
•The calc method takes two numbers (n1 and n2) and an operator (op) as input, and it performs the specified arithmetic operation. •It supports addition, subtraction, multiplication, and division. If division by zero is attempted, it returns 0 without raising an exception.
Checking for Operators (isOperator):
•This method checks if a given button is an operator. It compares the text of the button to the operator symbols (+, -, *, /, =).
Error Handling: The code includes handling exceptions related to setting the look and feel of the application.
Clear and Reset:
The 'clear' button allows users to remove the last character from the input in the text field.
The 'reset' button resets the calculator, clearing all variables and resetting the text field to '0'.
Input:
•User input is primarily entered through button clicks on the calculator's GUI. Users can input digits (0-9), perform arithmetic operations (+, -, *, /), and request calculation results (=).
Output:
•The program displays the results of calculations in the text field.
•The graphical user interface visually presents the calculator's buttons and the user's input.
•Users can see the calculated result in the text field.
package javaapplication2;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
public class JAVA_CALCULATOR extends javax.swing.JFrame {
/*
Creates new form JAVA_CALCULATOR
*/
float num1 = 0, num2 = 0,oprClickCount = 0;
String opr;
boolean isOprClick = false, isEqualClick = false;
public JAVA_CALCULATOR() {
initComponents();
addAction();
}
// create action when the user click
public ActionListener createAction(JButton button){
ActionListener acLis = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// if the button is not an operation (is number include '.')
if(!isOperator(button))
{
if(isOprClick)// if an opration is clicked
{
num1 = Float.valueOf(jTextField1.getText());
jTextField1.setText("");
}
if(!jTextField1.getText().contains(".")){ //if the text dont contain '.'
if(jTextField1.getText().equals("0") && !button.getText().equals(".")){
// if jtext contain only 0 clear text
// and the button pressed is not '.'
jTextField1.setText(button.getText());
isOprClick = false;
}
else
{
jTextField1.setText(jTextField1.getText()+button.getText());
isOprClick = false;
}
}
else if(!button.getText().equals(".")){
jTextField1.setText(jTextField1.getText()+button.getText());
isOprClick = false;
}
}
else{// if the button is an operation [+ - * / =]
if(oprClickCount == 0)// if an operation is clicked for the first time
{
oprClickCount++;
// convert the textField to float and set it into num1
num1 = Float.valueOf(jTextField1.getText());
opr = button.getText();
isOprClick = true;
}else{
if(!button.getText().equals("="))// if the operation is not '='
{
if(!isEqualClick)
{
num2 = Float.valueOf(jTextField1.getText());
jTextField1.setText(Float.toString(calc(opr, num1, num2)));
opr = button.getText();
num2 = Float.valueOf(jTextField1.getText());
isOprClick = true;
isEqualClick = false;
}else{
isEqualClick = false;
opr = button.getText();
}
}
else{
num2 = Float.valueOf(jTextField1.getText());
jTextField1.setText(Float.toString(calc(opr, num1, num2)));
num1 = Float.valueOf(jTextField1.getText());
isOprClick = true;
isEqualClick = true;
}
}
}
}
};
return acLis;
}
// calc two numbers and return the result
public float calc(String op, float n1, float n2)
{
float result = 0;
switch(op){
case "+":
result = n1 + n2;
break;
case "-":
result = n1 - n2;
break;
case "*":
result = n1 * n2;
break;
case "/":
if(n2 != 0)
result = n1 / n2;
break;
default:
break;
}
return result;
}
// check if the button is an operator
public boolean isOperator(JButton button)
{
String buttonText = button.getText();
if(buttonText.equals("+") || buttonText.equals("-") ||
buttonText.equals("*") || buttonText.equals("/") ||
buttonText.equals("="))
{
return true;
}
else{
return false;
}
}
// add action to all buttons
public void addAction(){
Component[] components = jPanel1.getComponents();
for(Component component : components){
if(component instanceof JButton){
JButton button = (JButton) component;
button.addActionListener(createAction(button));
}
}
}
@SuppressWarnings("unchecke")
//
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jTextField1 = new javax.swing.JTextField();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jButton4 = new javax.swing.JButton();
jButton5 = new javax.swing.JButton();
jButton6 = new javax.swing.JButton();
jButton7 = new javax.swing.JButton();
jButton8 = new javax.swing.JButton();
jButton9 = new javax.swing.JButton();
jButton10 = new javax.swing.JButton();
jButton11 = new javax.swing.JButton();
jButton12 = new javax.swing.JButton();
jButton13 = new javax.swing.JButton();
jButton14 = new javax.swing.JButton();
jButton15 = new javax.swing.JButton();
jButton16 = new javax.swing.JButton();
jButton17 = new javax.swing.JButton();
jButton18 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBackground(new java.awt.Color(153, 153, 153));
jTextField1.setFont(new java.awt.Font("Tahoma", 0, 24)); // NOI18N
jTextField1.setText("0");
jButton1.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton1.setText("+");
jButton2.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton2.setText("-");
jButton3.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton3.setText("*");
jButton4.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton4.setText("/");
jButton5.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton5.setText("0");
jButton6.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton6.setText("1");
jButton7.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton7.setText("2");
jButton8.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton8.setText("3");
jButton9.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton9.setText("4");
jButton10.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton10.setText("5");
jButton11.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton11.setText("6");
jButton12.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton12.setText("7");
jButton13.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton13.setText("8");
jButton14.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton14.setText("9");
jButton15.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton15.setText(".");
jButton16.setFont(new java.awt.Font("Tahoma", 0, 36)); // NOI18N
jButton16.setText("=");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(21, 21, 21)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton13, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton14, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton15, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton16, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addComponent(jButton9, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton10, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton11, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton12, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton5, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton6, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton7, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton8, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jTextField1)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton4, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE))))
.addContainerGap(24, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 55, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton4, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton5, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton6, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton7, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton8, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton9, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton10, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton11, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton12, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton13, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton14, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton15, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton16, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jButton17.setBackground(new java.awt.Color(51, 102, 255));
jButton17.setFont(new java.awt.Font("Tahoma", 0, 24)); // NOI18N
jButton17.setForeground(new java.awt.Color(255, 255, 255));
jButton17.setText("reset");
jButton17.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton17ActionPerformed(evt);
}
});
jButton18.setBackground(new java.awt.Color(255, 102, 0));
jButton18.setFont(new java.awt.Font("Tahoma", 0, 24)); // NOI18N
jButton18.setForeground(new java.awt.Color(255, 255, 255));
jButton18.setText("clear");
jButton18.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton18ActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addGap(21, 21, 21)
.addComponent(jButton17, javax.swing.GroupLayout.PREFERRED_SIZE, 158, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton18, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGap(24, 24, 24))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton17, javax.swing.GroupLayout.PREFERRED_SIZE, 51, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton18, javax.swing.GroupLayout.PREFERRED_SIZE, 51, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(0, 14, Short.MAX_VALUE))
);
pack();
}
private void jButton17ActionPerformed(java.awt.event.ActionEvent evt) {
num1 = 0;
num2 = 0;
oprClickCount = 0;
opr = "";
isOprClick = false;
isEqualClick = false;
jTextField1.setText("0");
}
private void jButton18ActionPerformed(java.awt.event.ActionEvent evt) {
if(jTextField1.getText().length() > 0)
{
String txt = jTextField1.getText();
String txtMinus = txt.substring(0, txt.length() - 1);
jTextField1.setText(txtMinus);
}
}
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(JAVA_CALCULATOR.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(JAVA_CALCULATOR.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(JAVA_CALCULATOR.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(JAVA_CALCULATOR.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new JAVA_CALCULATOR().setVisible(true);
}
});
}
// Variables declaration
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton10;
private javax.swing.JButton jButton11;
private javax.swing.JButton jButton12;
private javax.swing.JButton jButton13;
private javax.swing.JButton jButton14;
private javax.swing.JButton jButton15;
private javax.swing.JButton jButton16;
private javax.swing.JButton jButton17;
private javax.swing.JButton jButton18;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JButton jButton4;
private javax.swing.JButton jButton5;
private javax.swing.JButton jButton6;
private javax.swing.JButton jButton7;
private javax.swing.JButton jButton8;
private javax.swing.JButton jButton9;
private javax.swing.JPanel jPanel1;
private javax.swing.JTextField jTextField1;
// End of variables
}
Submitted by Ayush Gupta (Ayush07)
Download packets of source code on Coders Packet
Comments