Calculator using Core java and Swing

In this project we will learn to build a calculator using Core java and Swing.

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Here we go with the code – Calculor.java

package com.calculator;

import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JLabel;
import java.awt.Color;
import java.awt.Font;

public class Calculator {

	private JFrame frame;
	private JTextField textField;
	double ans,num;
	int calculation;
	
	public void arithmetic_Operation() {
		
		switch(calculation) {
		case 1: // Addition
			ans=num+Double.parseDouble(textField.getText());
			textField.setText(Double.toString(ans));
			break;
			
		case 2: // Subtraction
			ans=num-Double.parseDouble(textField.getText());
			textField.setText(Double.toString(ans));
			break;
		case 3: // Multiplication
			ans=num*Double.parseDouble(textField.getText());
			textField.setText(Double.toString(ans));
			break;
		case 4: // Division
			ans=num/Double.parseDouble(textField.getText());
			textField.setText(Double.toString(ans));
			break;
			
		}
	}
	

	public static void main(String[] args) {
		try {
            //here you can put the selected theme class name in JTattoo
            UIManager.setLookAndFeel("com.jtattoo.plaf.mcwin.McWinLookAndFeel");

        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
		
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					Calculator window = new Calculator();
					window.frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	
	public Calculator() {
		initialize();
	}

	
	private void initialize() {
		frame = new JFrame();
		frame.setResizable(false);
		frame.setBounds(100, 100, 384, 386);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.getContentPane().setLayout(null);
		
		textField = new JTextField();
		textField.setFont(new Font("Tahoma", Font.BOLD, 14));
		textField.setForeground(new Color(72, 61, 139));
		textField.setHorizontalAlignment(SwingConstants.TRAILING);
		textField.setBounds(10, 26, 346, 45);
		frame.getContentPane().add(textField);
		textField.setColumns(10);
		
		JButton button = new JButton("1");
		button.setForeground(new Color(0, 139, 139));
		button.setFont(new Font("Tahoma", Font.BOLD, 14));
		button.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				textField.setText(textField.getText()+"1");
				
			}
		});
		
		JLabel myLabel = new JLabel("");
		myLabel.setForeground(new Color(128, 0, 0));
		myLabel.setHorizontalAlignment(SwingConstants.TRAILING);
		myLabel.setBounds(221, 1, 124, 14);
		frame.getContentPane().add(myLabel);
		button.setBounds(10, 94, 79, 37);
		frame.getContentPane().add(button);
		
		JButton button_1 = new JButton("2");
		button_1.setForeground(new Color(0, 139, 139));
		button_1.setFont(new Font("Tahoma", Font.BOLD, 14));
		button_1.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				textField.setText(textField.getText()+"2");
			}
		});
		button_1.setBounds(99, 94, 79, 37);
		frame.getContentPane().add(button_1);
		
		JButton button_2 = new JButton("3");
		button_2.setForeground(new Color(0, 139, 139));
		button_2.setFont(new Font("Tahoma", Font.BOLD, 14));
		button_2.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				textField.setText(textField.getText()+"3");
			}
		});
		button_2.setBounds(188, 94, 79, 37);
		frame.getContentPane().add(button_2);
		
		JButton button_3 = new JButton("+");
		button_3.setForeground(new Color(0, 139, 139));
		button_3.setFont(new Font("Tahoma", Font.BOLD, 14));
		button_3.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				num= Double.parseDouble(textField.getText());
				calculation=1;
				myLabel.setText(textField.getText()+"+");
				textField.setText("");
				
			}
		});
		button_3.setBounds(280, 94, 79, 37);
		frame.getContentPane().add(button_3);
		
		JButton button_4 = new JButton("4");
		button_4.setForeground(new Color(0, 139, 139));
		button_4.setFont(new Font("Tahoma", Font.BOLD, 14));
		button_4.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				textField.setText(textField.getText()+"4");
			}
		});
		button_4.setBounds(10, 142, 79, 37);
		frame.getContentPane().add(button_4);
		
		JButton button_5 = new JButton("5");
		button_5.setForeground(new Color(0, 139, 139));
		button_5.setFont(new Font("Tahoma", Font.BOLD, 14));
		button_5.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				textField.setText(textField.getText()+"5");
			}
		});
		button_5.setBounds(99, 142, 79, 37);
		frame.getContentPane().add(button_5);
		
		JButton button_6 = new JButton("6");
		button_6.setForeground(new Color(0, 139, 139));
		button_6.setFont(new Font("Tahoma", Font.BOLD, 14));
		button_6.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				textField.setText(textField.getText()+"6");
			}
		});
		button_6.setBounds(188, 142, 79, 37);
		frame.getContentPane().add(button_6);
		
		JButton button_7 = new JButton("7");
		button_7.setForeground(new Color(0, 139, 139));
		button_7.setFont(new Font("Tahoma", Font.BOLD, 14));
		button_7.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				textField.setText(textField.getText()+"7");
			}
		});
		button_7.setBounds(10, 190, 79, 37);
		frame.getContentPane().add(button_7);
		
		JButton button_8 = new JButton("8");
		button_8.setForeground(new Color(0, 139, 139));
		button_8.setFont(new Font("Tahoma", Font.BOLD, 14));
		button_8.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				textField.setText(textField.getText()+"8");
			}
		});
		button_8.setBounds(99, 190, 79, 37);
		frame.getContentPane().add(button_8);
		
		JButton button_9 = new JButton("9");
		button_9.setForeground(new Color(0, 139, 139));
		button_9.setFont(new Font("Tahoma", Font.BOLD, 14));
		button_9.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				textField.setText(textField.getText()+"9");
			}
		});
		button_9.setBounds(188, 190, 79, 37);
		frame.getContentPane().add(button_9);
		
		JButton button_10 = new JButton(".");
		button_10.setForeground(new Color(0, 139, 139));
		button_10.setFont(new Font("Tahoma", Font.BOLD, 14));
		button_10.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				textField.setText(textField.getText()+".");
			}
		});
		button_10.setBounds(10, 248, 79, 37);
		frame.getContentPane().add(button_10);
		
		JButton button_11 = new JButton("0");
		button_11.setForeground(new Color(0, 139, 139));
		button_11.setFont(new Font("Tahoma", Font.BOLD, 14));
		button_11.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				textField.setText(textField.getText()+"0");
			}
		});
		button_11.setBounds(99, 248, 79, 37);
		frame.getContentPane().add(button_11);
		
		JButton btnBack = new JButton("BACK");
		btnBack.setForeground(new Color(0, 139, 139));
		btnBack.setFont(new Font("Tahoma", Font.BOLD, 14));
		btnBack.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				int length = textField.getText().length();
				int number= textField.getText().length()-1;
				String store;
				if(length>0) {
				StringBuilder sb = new StringBuilder(textField.getText());
				sb.deleteCharAt(number);
				store=sb.toString();
				textField.setText(store);
				}
				
			}
		});
		btnBack.setBounds(188, 248, 79, 37);
		frame.getContentPane().add(btnBack);
		
		JButton btnClear = new JButton("CLEAR");
		btnClear.setForeground(new Color(0, 139, 139));
		btnClear.setFont(new Font("Tahoma", Font.BOLD, 14));
		btnClear.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				textField.setText("");
				myLabel.setText("");
			}
		});
		btnClear.setBounds(10, 295, 168, 37);
		frame.getContentPane().add(btnClear);
		
		JButton btnResult = new JButton("RESULT");
		btnResult.setForeground(new Color(0, 139, 139));
		btnResult.setFont(new Font("Tahoma", Font.BOLD, 14));
		btnResult.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				arithmetic_Operation();
				myLabel.setText("");
			}
		});
		btnResult.setBounds(188, 295, 171, 37);
		frame.getContentPane().add(btnResult);
		
		JButton button_16 = new JButton("-");
		button_16.setForeground(new Color(0, 139, 139));
		button_16.setFont(new Font("Tahoma", Font.BOLD, 14));
		button_16.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				num= Double.parseDouble(textField.getText());
				calculation=2;
				myLabel.setText(textField.getText()+"-");
				textField.setText("");
			}
		});
		button_16.setBounds(280, 142, 79, 37);
		frame.getContentPane().add(button_16);
		
		JButton button_17 = new JButton("*");
		button_17.setForeground(new Color(0, 139, 139));
		button_17.setFont(new Font("Tahoma", Font.BOLD, 14));
		button_17.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				num= Double.parseDouble(textField.getText());
				calculation=3;
				myLabel.setText(textField.getText()+"*");
				textField.setText("");
			}
		});
		button_17.setBounds(280, 190, 79, 37);
		frame.getContentPane().add(button_17);
		
		JButton button_18 = new JButton("/");
		button_18.setForeground(new Color(0, 139, 139));
		button_18.setFont(new Font("Tahoma", Font.BOLD, 14));
		button_18.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				num= Double.parseDouble(textField.getText());
				calculation=1;
				myLabel.setText(textField.getText()+"/");
				textField.setText("");
			}
		});
		button_18.setBounds(280, 248, 79, 37);
		frame.getContentPane().add(button_18);
	}

}

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Code for implementing JTattoo Look and Feel
try {
            //here you can put the selected theme class name in JTattoo
            UIManager.setLookAndFeel("com.jtattoo.plaf.mcwin.McWinLookAndFeel");

        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(MyCalculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(MyCalculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(MyCalculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(MyCalculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }

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