Calculator

import java.awt.EventQueue;

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

public class CalculatorUKTC {

    private JFrame frame;
    private JTextField num1Field;
    private JTextField num2Field;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    CalculatorUKTC window = new CalculatorUKTC();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public CalculatorUKTC() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new JFrame();
        frame.getContentPane().setBackground(SystemColor.menu);
        frame.getContentPane().setForeground(Color.BLACK);
        frame.setBounds(100, 100, 450, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);

        num1Field = new JTextField();
        num1Field.setBounds(169, 44, 86, 20);
        frame.getContentPane().add(num1Field);
        num1Field.setColumns(10);

        num2Field = new JTextField();
        num2Field.setBounds(169, 87, 86, 20);
        frame.getContentPane().add(num2Field);
        num2Field.setColumns(10);

        JLabel resultLbl = new JLabel("Result:");
        resultLbl.setFont(new Font("Tahoma", Font.PLAIN, 18));
        resultLbl.setHorizontalAlignment(SwingConstants.LEFT);
        resultLbl.setBounds(47, 210, 149, 27);
        frame.getContentPane().add(resultLbl);

        JLabel lblNewLabel = new JLabel("Number 1:");
        lblNewLabel.setFont(new Font("Tahoma", Font.PLAIN, 16));
        lblNewLabel.setHorizontalAlignment(SwingConstants.CENTER);
        lblNewLabel.setBounds(29, 44, 108, 17);
        frame.getContentPane().add(lblNewLabel);

        JLabel lblNewLabel_1 = new JLabel("Number 2:");
        lblNewLabel_1.setFont(new Font("Tahoma", Font.PLAIN, 16));
        lblNewLabel_1.setHorizontalAlignment(SwingConstants.CENTER);
        lblNewLabel_1.setBounds(29, 87, 108, 17);
        frame.getContentPane().add(lblNewLabel_1);

        JButton clearBtn = new JButton("C");
        clearBtn.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                num1Field.setText("");
                num2Field.setText("");
                resultLbl.setText("Result:");
            }
        });
        clearBtn.setBounds(29, 140, 49, 44);
        frame.getContentPane().add(clearBtn);

        JButton multiplyBtn = new JButton("X");
        multiplyBtn.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                try {
                    double num1 = Double.parseDouble(num1Field.getText());
                    double num2 = Double.parseDouble(num2Field.getText());
                    double result = num1 * num2;
                    resultLbl.setText("Result: " + result);
                } catch (NumberFormatException e1) {
                    resultLbl.setText("Invalid input!");
                    num1Field.setText("");
                    num2Field.setText("");
                }
            }
        });
        multiplyBtn.setBounds(88, 140, 49, 44);
        frame.getContentPane().add(multiplyBtn);

        JButton devideBtn = new JButton("/");
        devideBtn.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                try {
                    double num1 = Double.parseDouble(num1Field.getText());
                    double num2 = Double.parseDouble(num2Field.getText());
                    double result = num1 / num2;
                    resultLbl.setText("Result: " + result);
                } catch (NumberFormatException e1) {
                    resultLbl.setText("Invalid input!");
                    num1Field.setText("");
                    num2Field.setText("");
                }
            }
        });
        devideBtn.setBounds(147, 140, 49, 44);
        frame.getContentPane().add(devideBtn);

        JButton sumBtn = new JButton("+");
        sumBtn.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                try {
                    double num1 = Double.parseDouble(num1Field.getText());
                    double num2 = Double.parseDouble(num2Field.getText());
                    double result = num1 + num2;
                    resultLbl.setText("Result: " + result);
                } catch (NumberFormatException e1) {
                    resultLbl.setText("Invalid input!");
                    num1Field.setText("");
                    num2Field.setText("");
                }
            }
        });
        sumBtn.setBounds(206, 140, 49, 44);
        frame.getContentPane().add(sumBtn);

        JButton button_2 = new JButton("-");
        button_2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                try {
                    double num1 = Double.parseDouble(num1Field.getText());
                    double num2 = Double.parseDouble(num2Field.getText());
                    double result = num1 - num2;
                    resultLbl.setText("Result: " + result);
                } catch (NumberFormatException e1) {
                    resultLbl.setText("Invalid input!");
                    num1Field.setText("");
                    num2Field.setText("");
                }
            }
        });
        button_2.setBounds(265, 140, 49, 44);
        frame.getContentPane().add(button_2);

    }
}