Thread: GUI HELP

I've just started to learn GUI and I'm trying to learn how to make the window open full screen, could someone please add it in cause GUI makes no sense to me.

import javax.swing.*;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
public class HelloWorld implements ActionListener{
	static String text= "hello world";
	public static int count1;
	public static int count2;
	JFrame frame;
	JPanel content;
	JLabel lblGeneral1;
	JLabel lblGeneral2;
	JButton btnTest1;
	JButton btnTest2;
	JLabel label1;
	JLabel label2;
 
	public HelloWorld(){
		//create frame
		frame=new JFrame ("Hello World");	
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);	
 
		//create panel
		content= new JPanel();
		content.setLayout(new BoxLayout(content, BoxLayout.PAGE_AXIS));
 
		//set button1
		btnTest1=new JButton("Superior");
		btnTest1.setActionCommand("1");
		btnTest1.addActionListener(this);
		btnTest1.setAlignmentY(Component.CENTER_ALIGNMENT);
		btnTest1.setAlignmentX(Component.LEFT_ALIGNMENT);
		content.add(btnTest1);
 
		//set button2
		btnTest2=new JButton("Superior");
		btnTest2.setActionCommand("2");
		btnTest2.addActionListener(this);
		btnTest2.setAlignmentY(Component.CENTER_ALIGNMENT);
		btnTest2.setAlignmentX(Component.RIGHT_ALIGNMENT);
		content.add(btnTest2);
 
		//create label
		lblGeneral1=new JLabel(Integer.toString(count1));
		lblGeneral1.setAlignmentY(Component.BOTTOM_ALIGNMENT);
		lblGeneral1.setAlignmentX(Component.LEFT_ALIGNMENT);
		content.add(lblGeneral1);
 
		//create label
		lblGeneral2=new JLabel(Integer.toString(count2));
		lblGeneral2.setAlignmentY(Component.BOTTOM_ALIGNMENT);
		lblGeneral2.setAlignmentX(Component.RIGHT_ALIGNMENT);
		content.add(lblGeneral2);
 
		//add picture box
		String imgStr = "Penguins.jpg";		
		ImageIcon image = new ImageIcon(imgStr);
		JLabel label1 = new JLabel(image);
		label1.setAlignmentY(Component.TOP_ALIGNMENT);
		label1.setAlignmentX(Component.LEFT_ALIGNMENT);
		content.add(label1);
 
		//add picture box
		String imgStr2 = "Penguins.jpg";		
		ImageIcon image2 = new ImageIcon(imgStr);
		JLabel label2 = new JLabel(image);
		label2.setAlignmentY(Component.TOP_ALIGNMENT);
		label2.setAlignmentX(Component.RIGHT_ALIGNMENT);
		content.add(label1);
 
		//content to frame
		frame.setContentPane(content);
 
		//set display
		frame.pack();
		frame.setVisible(true);
	}
 
	//handle button click
	public void actionPerformed(ActionEvent event){
		String btn=event.getActionCommand();
		if (btn.equals("1"))
			count1++;
		else
			count2++;
		lblGeneral1.setText(Integer.toString(count1));
		lblGeneral2.setText(Integer.toString(count2));
 
	}
 
	//show the GUI
	public static void runGUI(){
		JFrame.setDefaultLookAndFeelDecorated(true);
		HelloWorld greeting=new HelloWorld();
	}
 
	public static void main (String[] args){
		//methods that show GUI should be run from a event dispatcher
		count1=0;
		count2=0;
		javax.swing.SwingUtilities.invokeLater(new Runnable(){
			public void run(){
				runGUI();
			}
		});
	}	
}

make the window open full screen, could someone please add it in cause GUI makes no sense to me.

We are not a code service, but we will help you should you have problems in your attempts. Yet I fail to see what you've attempted. Did you search the internet or look through the API to look for a solution? With what you found, what did you try and what happened?
And please wrap your code in the proper tags([highlight=java][/highlight])