Array multi-dimensional

protected static void multi ()
	{
		int [][] x = new int[2][4];

		for(int j =0; j<x.length; j++, System.out.print("\n")){
			
			for(int i = 0; i<x[j].length; i++)
			{
				System.out.print(	x[j][i] +" ");	
				
			}
			
			}

		int []a = {1,2,3,4,5,6};
		int []b = {10,20,30,40,50,60};
		x[0] = a;
		x[1] = b;
		
		System.out.println(":| ???");
		
		for(int j =0; j<x.length; j++, System.out.print("\n")){
		
		for(int i = 0; i<x[j].length; i++)
		{
			System.out.print(	x[j][i] +" ");	
			
		}
		
		}

	}