import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;
import java.util.*;

public class Transfer extends JFrame implements ActionListener
{
	//Declare output stream
	DataOutputStream output;

	//Construct a panel for the fields and buttons
	JPanel fieldPanel = new JPanel();
	JPanel buttonPanel = new JPanel();

	//Construct labels and text boxes
	JLabel nameLabel = new JLabel("Name:                    ");
		JTextField name = new JTextField(30);
	JLabel idLabel = new JLabel ("Student ID");
		JTextField id = new JTextField(30);
	JLabel courseNumLabel = new JLabel("Transfer Course Number:			");
		JTextField courseNum = new JTextField(30);
	JLabel localCourseLabel = new JLabel("Local Course Number:");
		JTextField localCourse = new JTextField(30);

	//Construct button
	JButton submitButton = new JButton("Submit");
	JButton exitButton = new JButton("Exit");

	public static void main(String[] args)
	{
		Transfer f = new Transfer();
		f.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
		f.setSize(450,300);
		f.setTitle("Transfer Course Substitutions");
		f.setVisible(true);
	} //ends main method

	public Transfer()
	{
		Container c = getContentPane();
		c.setLayout((new BorderLayout()));
		fieldPanel.setLayout(new GridLayout(4,2));
		buttonPanel.setLayout(new FlowLayout(FlowLayout.CENTER));

		//Add fields to rows
		fieldPanel.add(nameLabel);
		fieldPanel.add(name);

		fieldPanel.add(idLabel);
		fieldPanel.add(id);

		fieldPanel.add(courseNumLabel);
		fieldPanel.add(courseNum);


		fieldPanel.add(localCourseLabel);
		fieldPanel.add(localCourse);

		//Add button to panel
		buttonPanel.add(submitButton);
		buttonPanel.add(exitButton);

		//Add Panels to frame
		c.add(fieldPanel, BorderLayout.CENTER);
		c.add(buttonPanel, BorderLayout.SOUTH);

		//add functionality to buttons
		submitButton.addActionListener(this);
		exitButton.addActionListener(this);

		try
		{
			new DataOutputStream(new FileOutputStream("Transfer.dat"));
		} //ends try statement
		catch (IOException io)
		{
			System.exit(1);
		} //ends catch statement

		addWindowListener(
			new WindowAdapter()
			{
				public void windowClosing(WindowEvent e)
				{
					int answer = JOptionPane.showConfirmDialog(null, "Are you sure you want to exit and submit the file?", "File Submittions", JOptionPane.YES_NO_OPTION);
					if (answer == JOptionPane.YES_OPTION)
						System.exit(0);
				} //ends windowClosing statement
			} //ends window adpater
		); //ends window listener
}//ends transfer constructor
	public void actionPerformed(ActionEvent e)
	{
		String arg = e.getActionCommand();
		if (arg == "Submit")
		{
			try
			{
				output.writeUTF(name.getText());
				output.writeUTF(id.getText());
				output.writeUTF(courseNum.getText());
				output.writeUTF(localCourse.getText());
			} //ends try statement
			catch(IOException ex)
			{
				System.exit(1);
			} //ends catch statement
			clearFields();
		} //ends if statement
		else //code to execute if the user clicks Exit
		{
			try
			{
				output.close();
			} //ends try statement
			catch(IOException c)
			{
				System.exit(1);
			}//ends catch statement
			System.exit(0);
		} //ends else statement
	}//ends action performed method
	public void clearFields()
	{
		//Clear fields and reset the focus
		name.setText("");
		id.setText("");
		courseNum.setText("");
		localCourse.setText("");
		name.requestFocus();
	} //ends clear fields method
} //ends transfer class

Ok I have attached the "weird" message I am getting in the command prompt in the back.
I dont understand what causes this. I think it comes from something in my action performed method, but I don't understand what.
Appreciate any guidance/help.

seriously, you're not wasting bandwith by posting your exceptions on the forum instead of expecting us to open an attachement. very few of us actually will, you know

seriously, you're not wasting bandwith by posting your exceptions on the forum instead of expecting us to open an attachement. very few of us actually will, you know

Well since I didnt know what all of it meant, and what all was important I thought it would be helpful, at least when I help people screenshots are helpful, and I did not know how to copy and paste from that screen I just attached...figured out how to do that, so theres the exceptions that I am getting in the command prompt and hopefully someone can help

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at Transfer.actionPerformed(Transfer.java:111)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:18
49)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.jav
a:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel
.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258
)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonL
istener.java:234)
at java.awt.Component.processMouseEvent(Component.java:5488)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3093)
at java.awt.Component.processEvent(Component.java:5253)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3955)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212
)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)

at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1766)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:234)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

Have you tried reading the errors that you get? Because If you had the solution would be very easy:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at Transfer.actionPerformed(Transfer.java:111)

You get a NullPointerException at the Transfer.java file, at the actionPerformed method at line 111.

You are using something which is null. Initialize it.

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