Thread: getBounds problem

Hello,

I am doing exercises in my java book and right now I am stuck on an example. This example is supposed to show me how to use the setBounds method of the JFrame class to move a frame window to a given rectangle. I tried playing around with the code and can't seem to figure out what I am doing wrong. I have looked at the API as well which made me try to set parameters in setBounds, but I am still not seeing anything appear on the frame when I run.

Here are the two different codes I have tried. Can anyone direct me what to look at or give me a hint without giving me the answer. I would like to figure this out on my own, but need direction. Thank you.

import java.awt.Rectangle;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
 
public class TranslateDemo {
	public static void main(String[] args)
	{
		// Constructs a frame and show it
		JFrame frame = new JFrame();
		frame.setSize(300, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
 
		Rectangle box = new Rectangle (5, 5, 5, 5);
		box.setBounds(box);
		box.getBounds();
 
		JOptionPane.showMessageDialog(frame, "Click OK to continue");
 
		box.translate(10, 10);
		box.setBounds(box);
		box.getBounds();
	}
}

import java.awt.Rectangle;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
 
public class TranslateDemo {
	public static void main(String[] args)
	{
		// Constructs a frame and show it
		JFrame frame = new JFrame();
		frame.setSize(300, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
 
		Rectangle box = new Rectangle (5, 5, 5, 5);
		box.setBounds(10, 10, 10, 10);
		box.getBounds();
 
		JOptionPane.showMessageDialog(frame, "Click OK to continue");
 
		box.translate(10, 10);
		box.setBounds(20, 20, 20, 20);
		box.getBounds();
	}
}

A change of 10 pixels is very small and may not be perceptible, but I don't think what you're expecting to happen is what is supposed to happen. Try this main() method to get an idea of what setBounds() does:

	public static void main(String[] args)
	{
		// Constructs a frame and show it
		JFrame frame = new JFrame();
		frame.setSize(300, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setBounds( new Rectangle( 400, 400, 200, 200 ) );
		frame.setVisible(true);
 
		JOptionPane.showMessageDialog(frame, "Click OK to continue");
 
		frame.setBounds( new Rectangle( 500, 500, 400, 400 ) );
	}