Calculator with windows builder

import java.awt.EventQueue;

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

public class calc {

    private JFrame frame;
    private JTextField num2field;
    private JTextField num1field;

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

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

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new JFrame();
        frame.getContentPane().setFont(new Font("Comic Sans MS", Font.PLAIN, 20));
        frame.getContentPane().setBackground(new Color(51, 204, 51));
        frame.setBounds(100, 100, 618, 382);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);

        JLabel num1Label = new JLabel("Number 1:");
        num1Label.setFont(new Font("Comic Sans MS", Font.PLAIN, 20));
        num1Label.setBounds(46, 26, 102, 48);
        frame.getContentPane().add(num1Label);

        JLabel num2Label = new JLabel("Number 2:");
        num2Label.setFont(new Font("Comic Sans MS", Font.PLAIN, 20));
        num2Label.setBounds(46, 134, 102, 34);
        frame.getContentPane().add(num2Label);

        num2field = new JTextField();
        num2field.setBounds(238, 136, 116, 38);
        frame.getContentPane().add(num2field);
        num2field.setColumns(10);

        JLabel resultLabel = new JLabel("Result:");
        resultLabel.setFont(new Font("Comic Sans MS", Font.PLAIN, 20));
        resultLabel.setBounds(46, 294, 476, 38);
        frame.getContentPane().add(resultLabel);

        JButton Clear = new JButton("C");
        Clear.setFont(new Font("Comic Sans MS", Font.PLAIN, 11));
        Clear.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                num1field.setText(" ");
                num2field.setText(" ");
                resultLabel.setText("Result: ");
            }
        });
        Clear.setBounds(458, 82, 89, 67);
        frame.getContentPane().add(Clear);

        JButton btnNewButton_1 = new JButton("+");
        btnNewButton_1.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;
                    resultLabel.setText(String.format("Result: %.3f", result));
                } catch (NumberFormatException e1) {
                    resultLabel.setText("Result: Invalid input");
                }
            }
        });
        btnNewButton_1.setBounds(47, 224, 55, 34);
        frame.getContentPane().add(btnNewButton_1);

        JButton btnNewButton_2 = new JButton("-");
        btnNewButton_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;
                    resultLabel.setText(String.format("Result: %.3f", result));
                } catch (NumberFormatException e1) {
                    resultLabel.setText("Result: Invalid input");
                }
            }
        });
        btnNewButton_2.setBounds(139, 224, 55, 34);
        frame.getContentPane().add(btnNewButton_2);

        JButton btnNewButton_3 = new JButton("*");
        btnNewButton_3.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;
                    resultLabel.setText(String.format("Result: %.3f", result));
                } catch (NumberFormatException e1) {
                    resultLabel.setText("Result: Invalid input");
                }
            }
        });
        btnNewButton_3.setBounds(227, 224, 55, 34);
        frame.getContentPane().add(btnNewButton_3);

        JButton btnNewButton_4 = new JButton("/");
        btnNewButton_4.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;
                    resultLabel.setText(String.format("Result: %.3f", result));
                } catch (NumberFormatException e1) {
                    resultLabel.setText("Result: Invalid input");
                }
            }
        });
        btnNewButton_4.setBounds(305, 224, 55, 34);
        frame.getContentPane().add(btnNewButton_4);

        JButton btnNewButton_5 = new JButton("Max");
        btnNewButton_5.setFont(new Font("Comic Sans MS", Font.PLAIN, 11));
        btnNewButton_5.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                try {
                    double num1 = Double.parseDouble(num1field.getText());
                    double num2 = Double.parseDouble(num2field.getText());
                    double result = Math.max(num1, num2);
                    resultLabel.setText(String.format("Result: %.3f", result));
                } catch (NumberFormatException e1) {
                    resultLabel.setText("Result: Invalid input");
                }
            }
        });
        btnNewButton_5.setBounds(401, 224, 89, 34);
        frame.getContentPane().add(btnNewButton_5);

        JButton btnNewButton_6 = new JButton("Min");
        btnNewButton_6.setFont(new Font("Comic Sans MS", Font.PLAIN, 11));
        btnNewButton_6.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                try {
                    double num1 = Double.parseDouble(num1field.getText());
                    double num2 = Double.parseDouble(num2field.getText());
                    double result = Math.min(num1, num2);
                    resultLabel.setText(String.format("Result: %.3f", result));
                } catch (NumberFormatException e1) {
                    resultLabel.setText("Result: Invalid input");
                }
            }
        });
        btnNewButton_6.setBounds(500, 224, 92, 34);
        frame.getContentPane().add(btnNewButton_6);

        num1field = new JTextField();
        num1field.setBounds(238, 37, 116, 34);
        frame.getContentPane().add(num1field);
        num1field.setColumns(10);

    }
}