JFrame won't open when running application in Eclipse

Question

I'm trying to create a simple GUI which takes two values and either subtracts/adds/divides dependant on which button the user selects. I'm comfortable with my code, but for some reason when I run my program, I'm not getting any visible frame, and I am also not getting any errors.

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

public class Calc {

private JFrame frame;
private JTextField firstNumber;
private JTextField secondNumber;
private JTextField textField_2;

/**
 * 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.setTitle("Simple Calculator");
    frame.setBounds(100, 100, 450, 300);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().setLayout(null);

    firstNumber = new JTextField();
    firstNumber.setBounds(28, 41, 156, 26);
    frame.getContentPane().add(firstNumber);
    firstNumber.setColumns(10);

    secondNumber = new JTextField();
    secondNumber.setBounds(28, 145, 156, 26);
    frame.getContentPane().add(secondNumber);
    secondNumber.setColumns(10);

    JLabel lblNewLabel = new JLabel("First Number");
    lblNewLabel.setBounds(28, 27, 110, 16);
    frame.getContentPane().add(lblNewLabel);

    JLabel lblNewLabel_1 = new JLabel("Second Number");
    lblNewLabel_1.setBounds(28, 131, 110, 16);
    frame.getContentPane().add(lblNewLabel_1);

    JLabel answerLabel = new JLabel("ANSWER:");
    answerLabel.setFont(new Font("Lucida Grande", Font.PLAIN, 20));
    answerLabel.setBounds(216, 46, 190, 16);
    frame.getContentPane().add(answerLabel);

    JButton plusButton = new JButton("Add");
    plusButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            try{
                int number1 = Integer.parseInt(firstNumber.getText());
            }
            catch (Exception exc){
                JOptionPane.showMessageDialog(frame,"Error: bad first number.");
                return;
            }
            try{
                int number2 = Integer.parseInt(secondNumber.getText());
            }
            catch (Exception exc){
                JOptionPane.showMessageDialog(frame,"Error: bad second number.");
                return;
            }
            int number1 = 0, number2 = 0;
            int answer = number1 + number2;
            answerLabel.setText("The answer is: "+answer);
        }
    });
    plusButton.setToolTipText("Adds first from second number");
    plusButton.setBounds(28, 183, 117, 29);
    frame.getContentPane().add(plusButton);

    JButton subtractButton = new JButton("Subtract");
    subtractButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            try{
                int number1 = Integer.parseInt(firstNumber.getText());
            }
            catch (Exception exc){
                JOptionPane.showMessageDialog(frame,"Error: bad first number.");
                return;
            }
            try{
                int number2 = Integer.parseInt(secondNumber.getText());
            }
            catch (Exception exc){
                JOptionPane.showMessageDialog(frame,"Error: bad second number.");
                return;
            }
            int number1 = 0, number2 = 0;
            int answer = number1 - number2;
            answerLabel.setText("The answer is: "+answer);
        }
    });
    subtractButton.setToolTipText("Subtracts first from second number");
    subtractButton.setBounds(157, 183, 117, 29);
    frame.getContentPane().add(subtractButton);

    JButton divideButton = new JButton("Divide");
    divideButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            try{
                int number1 = Integer.parseInt(firstNumber.getText());
            }
            catch (Exception exc){
                JOptionPane.showMessageDialog(frame,"Error: bad first number.");
                return;
            }
            try{
                int number2 = Integer.parseInt(secondNumber.getText());
            }
            catch (Exception exc){
                JOptionPane.showMessageDialog(frame,"Error: bad second number.");
                return;
            }
            int number1 = 0, number2 = 0;
            int answer = number1 / number2;
            answerLabel.setText("The answer is: "+answer);
        }
    });
    divideButton.setToolTipText("Divides first from second number");
    divideButton.setBounds(289, 183, 117, 29);
    frame.getContentPane().add(divideButton);

    textField_2 = new JTextField();
    textField_2.setBounds(216, 94, 130, 26);
    frame.getContentPane().add(textField_2);
    textField_2.setColumns(10);
}
}

Answer 1

Ah! this is an issue I've experienced earlier. This tip solved the issue. Here's How to do it.

Make sure that you've built it. Or you can enable Project --> Build Automatically.

After the above option is set, try cleaning the workspace. Project --> Clean and clean all the projects you've imported.

Now restart eclipse and you can launch your program.

ps: if it not work please send picture of eclipse with console so we could see logs and picture of running configration.