Java 程序设计源码 只提供了部分

import java.lang.Math;

public class Test{
	public static void main(String[] args) {
		int[][] array = {
				{1,2,3,4},
				{2,3,4,5},
				{3,4,5,6},
				{4,5,6,7},
				};
	
		//int sum;
	
		//System.out.println(a(array));
		a(array);
	}

	static void a(int[][] list)
	{
		int k = list.length - 1;
		int sum = 0;
		
		for(int i = k; i >= 0; i--) {	
			sum += (int)list[4 - i - 1][i];	
		}

		//return sum;
		System.out.println(sum);
	}


}