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http://www.daniweb.com – Why does this give the error "cannot reference this before supertype constructor has been called" I thought that is the first thing I did in the constructor. /*  * To change this template, choose Tools | Templates  * and open the template in the editor.  */ package application1; import java.awt.BorderLayout; import java.beans.PropertyVetoException; import java.io.FileNotFoundException; import java.io.IOException; import javax.swing.JInternalFrame; import javax.swing.JPanel; /**  *  * @author depot  */ public class InternalFrame extends JInternalFrame {     static final int xPosition = 30, yPosition = 30;     public static int openFrameCount = 0;     public String guideName = "guide";     public JInternalFrame frame;     //getGuideName() + (++openFrameCount), true, true, true, true     public InternalFrame() throws FileNotFoundException, IOException {                super(getGuideName() + (++openFrameCount), true, true, true, true);         System.out.println("internal frame openFrameCount= " + openFrameCount);         setVisible(true);         setSize(750, 500);         setLocation(xPosition * openFrameCount, yPosition * openFrameCount);             }   } (General)