Java对二维数组的遍历求和

二维数组的遍历，求和

		int [] [] s = {{1,2,3,4},{5,6,7,8,3,3},{9,10,11,12}};
		int sum=0;
		for (int i = 0; i < s.length; i++) {
			for (int j = 0; j < s[i].length; j++) {
				sum+=s[i][j];
			}
		}
		System.out.println(sum);
		Console:84;