Spiral Order Matrix

public class Solution {
	// DO NOT MODIFY THE LIST
	public ArrayList<Integer> spiralOrder(final List<ArrayList<Integer>> a) {
		 ArrayList<Integer> result = new ArrayList<Integer>();
		 // Populate result;
		 int T=0, B=a.size()-1, L=0, R=a.get(0).size()-1, direction=0;
		 while(T<=B && L<=R)
		 {
		     if(direction==0){
		     for(int i=L;i<=R;i++)
		     result.add(a.get(T).get(i));
		     T++;
		     }
		     
		     if(direction==1){
		     for(int i=T; i<=B;i++)
		     result.add(a.get(i).get(R));
		     R--;
		     }
		     
		     if(direction==2){
		     for(int i=R; i>=L;i--)
		     result.add(a.get(B).get(i));
		     B--;
		     }
		     
		     if(direction==3){
		     for(int i=B; i>=T;i--)
		     result.add(a.get(i).get(L));
		     L++;
		     }
		     
		     direction=(direction+1)%4;
		 }
		 return result;
	}
}