Question

1.用Java编写程序，求下列二维数组中各行元素之和并查找其值最大的那个行。 数组在问题补充里

{23, 45, 65, 34, 21, 67, 78},
{46, 14, 18, 46, 98, 63, 88},
{98, 81, 64, 90, 21, 14, 23},
{54, 43, 55, 76, 22, 43, 33};

Answer 1

public static void main(String[] args) {
int[][] arr = {{23, 45, 65, 34, 21, 67, 78},{46, 14, 18, 46, 98, 63, 88},{98, 81, 64, 90, 21, 14, 23},{54, 43, 55, 76, 22, 43, 33}};

for (int i = 0; i < arr.length; i++) {
int total=0;
for (int j = 0; j < arr[i].length; j++) {
total += arr[i][j];
}
System.out.println("第"+i+"行的和为:"+total);
}
}

记录每行的下标以及和，然后用排序算法查找其最大行

Answer 2

int[][] s={{23, 45, 65, 34, 21, 67, 78},
{46, 14, 18, 46, 98, 63, 88},
{98, 81, 64, 90, 21, 14, 23},
{54, 43, 55, 76, 22, 43, 33}};
int[] sum=new int[4];

for(int i=0;i<s.length;i++){
for(int z=0;z<s[i].length;z++){
sum[i]+=s[i][z];
}
}
System.out.println(Arrays.toString(sum));<----印出所有和还未排列
Arrays.sort(sum);
System.out.println(Arrays.toString(sum));<----印出所有和并由小到大排列

Answer 3

用两重 for循环就出来了

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