Defining an Array of ArryaList of ArrayList

**blinky000** · November 22nd, 2018, 12:58 PM

I have this :

public final static AxisAlignedBB BASE_AACB = new AxisAlignedBB		(0.0D, 0.0D, 0.0D,		1.0D , 0.5D, 1.0D);
public final static AxisAlignedBB NORTH_QTR_AACB = new AxisAlignedBB 	(0.0D  , 0.5D,  0.0D	, 1.0D , 1.0D,  0.5D);
public final static AxisAlignedBB WEST_RAIL_AACB = new AxisAlignedBB	(0.0D,	0.0D , 0.0D 	, 0.07D, 1.3D, 1.0D);	
 
public final static ArrayList<AxisAlignedBB> STAIR_STEPS_NORTH = new ArrayList<AxisAlignedBB>(Arrays.asList(BASE_AACB, NORTH_QTR_AACB));
.
.
.
 
 
	public final static ArrayList[] STAIR_STEPS_ALL = {STAIR_STEPS_NORTH, STAIR_STEPS_SOUTH, STAIR_STEPS_WEST, STAIR_STEPS_EAST};

I get a warning about raw types ( on the = {STAIR_STEPS_NORTH, STAIR_STEPS_SOUTH, STAIR_STEPS_WEST, STAIR_STEPS_EAST} part)

How can i define STAIR_STEPS_ALL[] correctly without rawtypes?

**Norm** · November 22nd, 2018, 02:02 PM

You can't create arrays with a generic component type.
Use a collection like List in place of the array.

**jim829** · November 22nd, 2018, 03:05 PM

You can do the following:

public final static ArrayList<?>[]				STAIR_STEPS_ALL	  = {
         STAIR_STEPS_NORTH, STAIR_STEPS_SOUTH, STAIR_STEPS_WEST,
         STAIR_STEPS_EAST
   };

However, when you retrieve one you will have to cast it. The SuppressWarnings statement isn't required as it just gets rid of a warning.

  public static void main(String[] args) {
	   @SuppressWarnings("unchecked")
	   ArrayList<AxisAlignedBB> b = (ArrayList<AxisAlignedBB>)STAIR_STEPS_ALL[0];
   }

But there is really no point to all of that. Since you have to cast you may as well declare the array as type Object and then cast as I did up above.

Regards,
Jim

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