7-1 编程练习题答案

import java.util.Scanner;

public class Test
{
	public static void main(String[] args)
	{
		System.out.println("Enter a 4-by-4 matrix row by row: ");
		Scanner input = new Scanner(System.in);
		int[][] number = new int[4][4];
		for(int i = 0; i < number.length; i++)
			for(int j = 0; j < number[i].length; j++)
				number[i][j] = input.nextInt();
		System.out.println("Sum of the matrix is " + sumMatrix(number));
	}

	public static double sumMatrix(int[][] m)
	{
		int total = 0;
		for(int row = 0; row < m.length; row++)
			for(int column = 0; column < m[row].length; column++)
				total += m[row][column];
		return total;
	}
}