Question

我想将2D数组求和：

我希望该方法对2D数组求和。但是，如果x大于y，则程序会获得异常。我试着调试它，但我不知道如何顺利修复它。如果x大于y，我应该创建另一种方法吗？ Points是包含所有值的数组。

 int x = //Random value
 int y = //Random value
 deltSum = new int[y];

 int output = 0;
 for (int t = 0; t < x; t++) {
    for (int i = 0; i < y; i++) {
        output += points[t][i]; //Add all values in the first section of the array.
    }
    deltSum[t] = output;
    System.out.println(output);
    output = 0;
 }

Answer 1

尝试分配x和y的值，如下所示：

int x = points.length;
int y = points[].length;
deltSum = new int[y];

了解如果Random值超出point[][]数组的索引，那么肯定会给你运行时异常。

Answer 2

如果您想要随机值，请在数组长度范围内使用Random Class，以获得x和y的不同和随机值，并避免ArrayIndexOutOfBound异常。

import java.util.Random; //to use Random Class...

...

Random randomGenerator = new Random(); //making instance of Random

//these statements will assign a value to x & y that is random 
//and smaller than the maximum length which is specified.
int x = randomGenerator.nextInt(points.length); //Will assign random value to x less then points.length
int y = randomGenerator.nextInt(points[0].length); ////Will assign random value to x less then points[].length

Java 2D数组总和（全部添加）

2 个答案: