HashSet set = new HashSet( true ); // allow duplicates
set.add( new Integer( 6 ) );
set.add( new Integer( 1 ) );
set.add( new Integer( 4 ) );
set.add( new Integer( 1 ) );
System.out.println( set );
System.out.println();
System.out.println( "Enumerate the HashSet" );
Enumeration e = set.elements();
while ( e.hasMoreElements() )
System.out.println( e.nextElement() );
System.out.println();
System.out.println( "Iterate through the HashSet" );
for ( HashSetIterator i = set.begin(); !i.atEnd(); i.advance() )
System.out.println( i.get() );
System.out.println();
System.out.println( "Show that duplicates can be added." );
set.add( new Integer( 8 ) );
System.out.println( "set = " + set );
set.add( new Integer( 4 ) );
System.out.println( "set = " + set );
