Fórum Centralizar janelas na tela #568020

import java.awt.Dimension;
import java.awt.Toolkit;

import javax.swing.ImageIcon;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class JForm extends JFrame {
private static final long serialVersionUID = 1L;
public static final int CENTER_SCREEN = 0;
public static final int FULL_SCREEN = 1;
private int sHeight;
private int sWidth;
private JPanel jp;

public void setIconImage(String fileName){
	ImageIcon ico = new ImageIcon(fileName);
	this.setIconImage(ico.getImage());
}
public void setScreen(int screenType){
	Toolkit tk = Toolkit.getDefaultToolkit(); 
	Dimension scrSize = tk.getScreenSize();
	switch(screenType){
		case 0:
			this.setSize(this.sWidth,this.sHeight);
			int scrWidth = scrSize.width - this.getWidth(); 
			int scrHeight = scrSize.height - this.getHeight();
			this.setLocation(scrWidth/2,scrHeight/2);
			break;
		case 1:
			this.setLocation(0,0);
			this.setSize(scrSize.width, scrSize.height);
			break;
	}
}

public void Show(){
	this.setVisible(true);
}

public void Close(){
	System.exit(0);
}

public JForm(String title,int Height,int Width){
    try {  
   	UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
   	this.sHeight = Height;
   	this.sWidth = Width;
   	jp = new JPanel(null);
   	this.setContentPane(jp);
   	this.setTitle(title);
	this.setSize(this.sWidth, this.sHeight);
	this.setDefaultCloseOperation(3);
    } catch (IllegalAccessException e) {} catch (ClassNotFoundException e) {  
    } catch (InstantiationException e) {} catch (UnsupportedLookAndFeelException e) {}
}

}