题目：输入一个m*n阶矩阵，找出m*n阶矩阵中的二阶矩阵和的最大值
输入样例：
1 2 3 0 4;4 3 5 1 2;3 2 4 7 5
输出样例：
17
------------------------------------------------I am a Dividing line---------------------------------------------
java代码：
import java.util.Scanner;
/**
* m*n阶矩阵中的2*2阶矩阵和最大值
*
* @author ForeverLover
*
*/
public class Matrix {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int m;
int n;
String s = scan.nextLine();
String[] sa = s.split(";");
m = sa.length;
String[][] ss = new String[m][];
for (int i = 0; i < m; i++)
ss[i] = sa[i].split(" ");
n = ss[0].length;
int[][] array = new int[m][n];
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
array[i][j] = Integer.parseInt((ss[i][j]));
}
}
int max = 0;
for (int i = 0; i < m - 1; i++) {
int sum = 0;
for (int j = 0; j < n - 1; j++) {
sum = array[i][j] + array[i][j + 1] + array[i + 1][j]
+ array[i + 1][j + 1];
max = sum >= max ? sum : max;
}
}
System.out.PRintln(max);
}
}