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This example shows how to create a simple window with Java, set the size and makes it visible:

import javax.swing.*;

public class GUITest
{
	public static void main(String[] args)
	{
	// Create the frame
	JFrame jframeTest = new JFrame();
	
	// Set the title of the JFrame
	jframeTest.setTitle("GUITest");
	
	// Set the size of the JFrame (widht, height)
	jframeTest.setSize(400,300);
		
	jframeTest.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	jframeTest.setVisible(true);
	}
}