nested type cannot hide an enclosing type

Question

What does this error mean?

The nested type HelloWorld cannot hide an enclosing type

Where HelloWorld is the java file name. Here's the code if you need it:

import net.java.games.jogl.*;
public class HelloWorld
{ // open HelloWorld

    public class HelloWorld
    { // open HelloWorld

        public static void main (String args[])
        { // open main
            try
            { // open try
                System.loadLibrary("jogl");
                System.out.println("Hello World! (The native libraries are installed.)");
            } // close try
            catch (Exception e) // all try's need a catch
            { } // even if the catch does nothing
        } // close main

    } // close HelloWorld

);

Answer 1

You have defined the HelloWorld class twice. Remove one level and you should be fine.

Answer 2

You're declaring the HelloWorld class twice.

Answer 3

Just delete one of your declarations for public class HelloWorld; you're using it twice, only one is required.

Answer 4

You need to delete one of the duplicated classes:

public class HelloWorld { // open HelloWorld

public class HelloWorld
{ // open HelloWorld

Answer 5

       import net.java.games.jogl.*; 
public class HelloWorld { 
    // open HelloWorld      
    public class HelloWorld     {
     // open HelloWorld 

Remove one of the public class HelloWorld { and corresponding } brace.