DList list = new DList();
list.add( "bat" );
list.add( "cat" );
list.add( "dog" );
System.out.println( "list = " + list );
list.insert( 0, "ape" );
System.out.println( "After insert at begin = " + list );
list.insert( list.size(), "emu" );
System.out.println( "After insert at end = " + list );
list.insert( 3, 2, "fox" );
System.out.println( "After list.insert( 3, 2, fox ) = " + list );
