What I need is to have the same GUI stay, but when the person goes to the menu and selects Editors > NPCSpawner, I need it to change from the default interface that's there (NPCSpawner interface) to the Other GUI (yes, it's called "Other"):

import org.rsbot.script.*;
import org.rsbot.script.wrappers.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

@ScriptManifest(authors = {"Feriscool"}, keywords = {"GUI2"}, name = "GUI2", description = "Testing GUI", version = 1)

public class GUI2 extends Script{
	
	NPCSpawn g = new NPCSpawn();

    @Override
    public boolean onStart() {
    	
    	g.setVisible(true);
    	
        return true;
    }

    public int loop() {
        return random(500, 1500);
    }

    @Override
    public void onFinish() {
    }
    
class NPCSpawn extends JFrame {
	public NPCSpawn() {
		initComponents();
	}

	private void button1ActionPerformed(ActionEvent e) {
		// TODO add your code here
	}

	private void button2ActionPerformed(ActionEvent e) {
		// TODO add your code here
	}

	private void menuItem3ActionPerformed(ActionEvent e) {
		Other();
	}

	private void initComponents() {
		// JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents
		// Generated using JFormDesigner Evaluation license - RS 2007
		menuBar1 = new JMenuBar();
		menu1 = new JMenu();
		menuItem2 = new JMenuItem();
		menu2 = new JMenu();
		menuItem3 = new JMenuItem();
		scrollPane1 = new JScrollPane();
		textArea1 = new JTextArea();
		textField4 = new JTextField();
		label1 = new JLabel();
		textField1 = new JTextField();
		textField7 = new JTextField();
		textField8 = new JTextField();
		textField12 = new JTextField();
		textField9 = new JTextField();
		textField5 = new JTextField();
		textField6 = new JTextField();
		textField10 = new JTextField();
		textField11 = new JTextField();
		textField2 = new JTextField();
		label2 = new JLabel();
		label3 = new JLabel();
		textField3 = new JTextField();
		label4 = new JLabel();
		label5 = new JLabel();
		label6 = new JLabel();
		label7 = new JLabel();
		label8 = new JLabel();
		label9 = new JLabel();
		label10 = new JLabel();
		label11 = new JLabel();
		label12 = new JLabel();
		label13 = new JLabel();
		button1 = new JButton();
		button2 = new JButton();

		//======== this ========
		setTitle("PJA Editor by Vault");
		Container contentPane = getContentPane();
		contentPane.setLayout(null);

		//======== menuBar1 ========
		{

			//======== menu1 ========
			{
				menu1.setText("File");

				//---- menuItem2 ----
				menuItem2.setText("Exit");
				menu1.add(menuItem2);
			}
			menuBar1.add(menu1);

			//======== menu2 ========
			{
				menu2.setText("Editors");

				//---- menuItem3 ----
				menuItem3.setText("NPCSpawner");
				menuItem3.setIcon(new ImageIcon("C:\\Users\\Patrick\\Desktop\\monster.png"));
				menuItem3.addActionListener(new ActionListener() {
					@Override
					public void actionPerformed(ActionEvent e) {
						menuItem3ActionPerformed(e);
					}
				});
				menu2.add(menuItem3);
			}
			menuBar1.add(menu2);
		}
		setJMenuBar(menuBar1);

		//======== scrollPane1 ========
		{

			//---- textArea1 ----
			textArea1.setToolTipText("The output of the code");
			scrollPane1.setViewportView(textArea1);
		}
		contentPane.add(scrollPane1);
		scrollPane1.setBounds(305, 25, 185, 225);

		//---- textField4 ----
		textField4.setToolTipText("The X coordinate of the NPC's spawn");
		contentPane.add(textField4);
		textField4.setBounds(10, 75, 80, 20);

		//---- label1 ----
		label1.setText("Output");
		contentPane.add(label1);
		label1.setBounds(375, 5, 65, 20);

		//---- textField1 ----
		textField1.setToolTipText("ID of the NPC");
		contentPane.add(textField1);
		textField1.setBounds(10, 25, 80, 20);

		//---- textField7 ----
		textField7.setToolTipText("The minimum X coordinate of the NPC's spawn");
		contentPane.add(textField7);
		textField7.setBounds(10, 125, 80, 20);

		//---- textField8 ----
		textField8.setToolTipText("The minimum Y coordinate of the NPC's spawn");
		contentPane.add(textField8);
		textField8.setBounds(105, 125, 80, 20);

		//---- textField12 ----
		textField12.setToolTipText("The maximum Z coordinate of the NPC's spawn");
		contentPane.add(textField12);
		textField12.setBounds(200, 175, 80, 20);

		//---- textField9 ----
		textField9.setToolTipText("The minimum Z coordinate of the NPC's spawn");
		contentPane.add(textField9);
		textField9.setBounds(200, 125, 80, 20);

		//---- textField5 ----
		textField5.setToolTipText("The Y coordinate of the NPC's spawn");
		contentPane.add(textField5);
		textField5.setBounds(105, 75, 80, 20);

		//---- textField6 ----
		textField6.setToolTipText("The Z coordinate of the NPC's spawn");
		contentPane.add(textField6);
		textField6.setBounds(200, 75, 80, 20);

		//---- textField10 ----
		textField10.setToolTipText("The maximum X coordinate of the NPC's spawn");
		contentPane.add(textField10);
		textField10.setBounds(10, 175, 80, 20);

		//---- textField11 ----
		textField11.setToolTipText("The maximum Y coordinate of the NPC's spawn");
		contentPane.add(textField11);
		textField11.setBounds(105, 175, 80, 20);

		//---- textField2 ----
		textField2.setToolTipText("Name of the NPC");
		contentPane.add(textField2);
		textField2.setBounds(105, 25, 80, 20);

		//---- label2 ----
		label2.setText("ID");
		contentPane.add(label2);
		label2.setBounds(45, 10, 15, 15);

		//---- label3 ----
		label3.setText("Name");
		contentPane.add(label3);
		label3.setBounds(new Rectangle(new Point(130, 10), label3.getPreferredSize()));

		//---- textField3 ----
		textField3.setToolTipText("The WalkingType of the NPC");
		contentPane.add(textField3);
		textField3.setBounds(200, 25, 80, 20);

		//---- label4 ----
		label4.setText("WalkingType");
		contentPane.add(label4);
		label4.setBounds(new Rectangle(new Point(210, 10), label4.getPreferredSize()));

		//---- label5 ----
		label5.setText("SpawnX");
		contentPane.add(label5);
		label5.setBounds(new Rectangle(new Point(30, 60), label5.getPreferredSize()));

		//---- label6 ----
		label6.setText("SpawnY");
		contentPane.add(label6);
		label6.setBounds(new Rectangle(new Point(125, 60), label6.getPreferredSize()));

		//---- label7 ----
		label7.setText("SpawnZ");
		contentPane.add(label7);
		label7.setBounds(new Rectangle(new Point(220, 60), label7.getPreferredSize()));

		//---- label8 ----
		label8.setText("MinX");
		contentPane.add(label8);
		label8.setBounds(new Rectangle(new Point(40, 110), label8.getPreferredSize()));

		//---- label9 ----
		label9.setText("MinY");
		contentPane.add(label9);
		label9.setBounds(new Rectangle(new Point(135, 110), label9.getPreferredSize()));

		//---- label10 ----
		label10.setText("MinZ");
		contentPane.add(label10);
		label10.setBounds(new Rectangle(new Point(230, 110), label10.getPreferredSize()));

		//---- label11 ----
		label11.setText("MaxX");
		contentPane.add(label11);
		label11.setBounds(new Rectangle(new Point(35, 160), label11.getPreferredSize()));

		//---- label12 ----
		label12.setText("MaxY");
		contentPane.add(label12);
		label12.setBounds(new Rectangle(new Point(130, 160), label12.getPreferredSize()));

		//---- label13 ----
		label13.setText("MaxZ");
		contentPane.add(label13);
		label13.setBounds(new Rectangle(new Point(225, 160), label13.getPreferredSize()));

		//---- button1 ----
		button1.setText("Generate");
		button1.setToolTipText("Generate the code");
		button1.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				button1ActionPerformed(e);
			}
		});
		contentPane.add(button1);
		button1.setBounds(45, 215, 90, 25);

		//---- button2 ----
		button2.setText("Reset");
		button2.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				button2ActionPerformed(e);
			}
		});
		contentPane.add(button2);
		button2.setBounds(150, 215, 90, 25);

		{ // compute preferred size
			Dimension preferredSize = new Dimension();
			for(int i = 0; i < contentPane.getComponentCount(); i++) {
				Rectangle bounds = contentPane.getComponent(i).getBounds();
				preferredSize.width = Math.max(bounds.x + bounds.width, preferredSize.width);
				preferredSize.height = Math.max(bounds.y + bounds.height, preferredSize.height);
			}
			Insets insets = contentPane.getInsets();
			preferredSize.width += insets.right;
			preferredSize.height += insets.bottom;
			contentPane.setMinimumSize(preferredSize);
			contentPane.setPreferredSize(preferredSize);
		}
		pack();
		setLocationRelativeTo(getOwner());
		// JFormDesigner - End of component initialization  //GEN-END:initComponents
	}

	// JFormDesigner - Variables declaration - DO NOT MODIFY  //GEN-BEGIN:variables
	// Generated using JFormDesigner Evaluation license - RS 2007
	private JMenuBar menuBar1;
	private JMenu menu1;
	private JMenuItem menuItem2;
	private JMenu menu2;
	private JMenuItem menuItem3;
	private JScrollPane scrollPane1;
	private JTextArea textArea1;
	private JTextField textField4;
	private JLabel label1;
	private JTextField textField1;
	private JTextField textField7;
	private JTextField textField8;
	private JTextField textField12;
	private JTextField textField9;
	private JTextField textField5;
	private JTextField textField6;
	private JTextField textField10;
	private JTextField textField11;
	private JTextField textField2;
	private JLabel label2;
	private JLabel label3;
	private JTextField textField3;
	private JLabel label4;
	private JLabel label5;
	private JLabel label6;
	private JLabel label7;
	private JLabel label8;
	private JLabel label9;
	private JLabel label10;
	private JLabel label11;
	private JLabel label12;
	private JLabel label13;
	private JButton button1;
	private JButton button2;
	// JFormDesigner - End of variables declaration  //GEN-END:variables
}

public class Other extends JFrame {
	public Other() {
		initComponents();
	}

	private void menuItem3ActionPerformed(ActionEvent e) {
		// TODO add your code here
	}

	private void initComponents() {
		// JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents
		// Generated using JFormDesigner Evaluation license - RS 2007
		menuBar1 = new JMenuBar();
		menu1 = new JMenu();
		menuItem2 = new JMenuItem();
		menu2 = new JMenu();
		menuItem3 = new JMenuItem();
		scrollPane1 = new JScrollPane();
		textArea1 = new JTextArea();
		textField4 = new JTextField();
		label1 = new JLabel();
		textField1 = new JTextField();
		textField7 = new JTextField();
		textField8 = new JTextField();
		textField12 = new JTextField();
		textField9 = new JTextField();
		textField5 = new JTextField();
		textField6 = new JTextField();
		textField10 = new JTextField();
		textField11 = new JTextField();
		textField2 = new JTextField();
		label2 = new JLabel();
		label3 = new JLabel();
		textField3 = new JTextField();
		label4 = new JLabel();
		label5 = new JLabel();
		label6 = new JLabel();
		label7 = new JLabel();
		label8 = new JLabel();
		label9 = new JLabel();
		label10 = new JLabel();
		label11 = new JLabel();
		label12 = new JLabel();
		label13 = new JLabel();

		//======== this ========
		setTitle("PJA Editor by Vault");
		Container contentPane = getContentPane();
		contentPane.setLayout(null);

		//======== menuBar1 ========
		{

			//======== menu1 ========
			{
				menu1.setText("File");

				//---- menuItem2 ----
				menuItem2.setText("Exit");
				menu1.add(menuItem2);
			}
			menuBar1.add(menu1);

			//======== menu2 ========
			{
				menu2.setText("Editors");

				//---- menuItem3 ----
				menuItem3.setText("NPCSpawner");
				menuItem3.setIcon(new ImageIcon("C:\\Users\\Patrick\\Desktop\\monster.png"));
				menuItem3.addActionListener(new ActionListener() {
					@Override
					public void actionPerformed(ActionEvent e) {
						menuItem3ActionPerformed(e);
					}
				});
				menu2.add(menuItem3);
			}
			menuBar1.add(menu2);
		}
		setJMenuBar(menuBar1);

		//======== scrollPane1 ========
		{

			//---- textArea1 ----
			textArea1.setToolTipText("The output of the code");
			scrollPane1.setViewportView(textArea1);
		}
		contentPane.add(scrollPane1);
		scrollPane1.setBounds(305, 25, 185, 225);

		//---- textField4 ----
		textField4.setToolTipText("The X coordinate of the NPC's spawn");
		contentPane.add(textField4);
		textField4.setBounds(10, 75, 80, 20);

		//---- label1 ----
		label1.setText("Output");
		contentPane.add(label1);
		label1.setBounds(375, 5, 65, 20);

		//---- textField1 ----
		textField1.setToolTipText("ID of the NPC");
		contentPane.add(textField1);
		textField1.setBounds(10, 25, 80, 20);

		//---- textField7 ----
		textField7.setToolTipText("The minimum X coordinate of the NPC's spawn");
		contentPane.add(textField7);
		textField7.setBounds(10, 125, 80, 20);

		//---- textField8 ----
		textField8.setToolTipText("The minimum Y coordinate of the NPC's spawn");
		contentPane.add(textField8);
		textField8.setBounds(105, 125, 80, 20);

		//---- textField12 ----
		textField12.setToolTipText("The maximum Z coordinate of the NPC's spawn");
		contentPane.add(textField12);
		textField12.setBounds(200, 175, 80, 20);

		//---- textField9 ----
		textField9.setToolTipText("The minimum Z coordinate of the NPC's spawn");
		contentPane.add(textField9);
		textField9.setBounds(200, 125, 80, 20);

		//---- textField5 ----
		textField5.setToolTipText("The Y coordinate of the NPC's spawn");
		contentPane.add(textField5);
		textField5.setBounds(105, 75, 80, 20);

		//---- textField6 ----
		textField6.setToolTipText("The Z coordinate of the NPC's spawn");
		contentPane.add(textField6);
		textField6.setBounds(200, 75, 80, 20);

		//---- textField10 ----
		textField10.setToolTipText("The maximum X coordinate of the NPC's spawn");
		contentPane.add(textField10);
		textField10.setBounds(10, 175, 80, 20);

		//---- textField11 ----
		textField11.setToolTipText("The maximum Y coordinate of the NPC's spawn");
		contentPane.add(textField11);
		textField11.setBounds(105, 175, 80, 20);

		//---- textField2 ----
		textField2.setToolTipText("Name of the NPC");
		contentPane.add(textField2);
		textField2.setBounds(105, 25, 80, 20);

		//---- label2 ----
		label2.setText("ID");
		contentPane.add(label2);
		label2.setBounds(45, 10, 15, 15);

		//---- label3 ----
		label3.setText("Name");
		contentPane.add(label3);
		label3.setBounds(new Rectangle(new Point(130, 10), label3.getPreferredSize()));

		//---- textField3 ----
		textField3.setToolTipText("The WalkingType of the NPC");
		contentPane.add(textField3);
		textField3.setBounds(200, 25, 80, 20);

		//---- label4 ----
		label4.setText("WalkingType");
		contentPane.add(label4);
		label4.setBounds(new Rectangle(new Point(210, 10), label4.getPreferredSize()));

		//---- label5 ----
		label5.setText("SpawnX");
		contentPane.add(label5);
		label5.setBounds(new Rectangle(new Point(30, 60), label5.getPreferredSize()));

		//---- label6 ----
		label6.setText("SpawnY");
		contentPane.add(label6);
		label6.setBounds(new Rectangle(new Point(125, 60), label6.getPreferredSize()));

		//---- label7 ----
		label7.setText("SpawnZ");
		contentPane.add(label7);
		label7.setBounds(new Rectangle(new Point(220, 60), label7.getPreferredSize()));

		//---- label8 ----
		label8.setText("MinX");
		contentPane.add(label8);
		label8.setBounds(new Rectangle(new Point(40, 110), label8.getPreferredSize()));

		//---- label9 ----
		label9.setText("MinY");
		contentPane.add(label9);
		label9.setBounds(new Rectangle(new Point(135, 110), label9.getPreferredSize()));

		//---- label10 ----
		label10.setText("MinZ");
		contentPane.add(label10);
		label10.setBounds(new Rectangle(new Point(230, 110), label10.getPreferredSize()));

		//---- label11 ----
		label11.setText("MaxX");
		contentPane.add(label11);
		label11.setBounds(new Rectangle(new Point(35, 160), label11.getPreferredSize()));

		//---- label12 ----
		label12.setText("MaxY");
		contentPane.add(label12);
		label12.setBounds(new Rectangle(new Point(130, 160), label12.getPreferredSize()));

		//---- label13 ----
		label13.setText("MaxZ");
		contentPane.add(label13);
		label13.setBounds(new Rectangle(new Point(225, 160), label13.getPreferredSize()));

		{ // compute preferred size
			Dimension preferredSize = new Dimension();
			for(int i = 0; i < contentPane.getComponentCount(); i++) {
				Rectangle bounds = contentPane.getComponent(i).getBounds();
				preferredSize.width = Math.max(bounds.x + bounds.width, preferredSize.width);
				preferredSize.height = Math.max(bounds.y + bounds.height, preferredSize.height);
			}
			Insets insets = contentPane.getInsets();
			preferredSize.width += insets.right;
			preferredSize.height += insets.bottom;
			contentPane.setMinimumSize(preferredSize);
			contentPane.setPreferredSize(preferredSize);
		}
		pack();
		setLocationRelativeTo(getOwner());
		// JFormDesigner - End of component initialization  //GEN-END:initComponents
	}

	// JFormDesigner - Variables declaration - DO NOT MODIFY  //GEN-BEGIN:variables
	// Generated using JFormDesigner Evaluation license - RS 2007
	private JMenuBar menuBar1;
	private JMenu menu1;
	private JMenuItem menuItem2;
	private JMenu menu2;
	private JMenuItem menuItem3;
	private JScrollPane scrollPane1;
	private JTextArea textArea1;
	private JTextField textField4;
	private JLabel label1;
	private JTextField textField1;
	private JTextField textField7;
	private JTextField textField8;
	private JTextField textField12;
	private JTextField textField9;
	private JTextField textField5;
	private JTextField textField6;
	private JTextField textField10;
	private JTextField textField11;
	private JTextField textField2;
	private JLabel label2;
	private JLabel label3;
	private JTextField textField3;
	private JLabel label4;
	private JLabel label5;
	private JLabel label6;
	private JLabel label7;
	private JLabel label8;
	private JLabel label9;
	private JLabel label10;
	private JLabel label11;
	private JLabel label12;
	private JLabel label13;
	// JFormDesigner - End of variables declaration  //GEN-END:variables
}
}

Have you a method that creates/makes visible the Other window? If not, create one. Then call it from the ActionPerformed of the menu item.

Alright, I got that working, so now how would I have the other GUI close while the new one is opening?

To close a window temporarily just set its visibility to false, then when you want it back just make it visible again.
To get rid of it call dispose(); for the top-level JFrame or whatever. That will get rid of the window and everything in it. If you need it again later you will have to re-execute the code that created it in the first place.

Alright, thanks. :)

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