你如何计算java中数组的元素 [英] How do you count the elements of an array in java

问题描述

说我有数组

int theArray = new int[20];

数组的长度为20，但计数为0.我如何计算？

The length of the array is 20 but the count is 0. How can i get the count?

推荐答案

伯爵是什么意思？具有非零值的元素数量？你只需要计算它们。

What do you mean by "the count"? The number of elements with a non-zero value? You'd just have to count them.

该数组与显式之间存在无区别设置为零值。例如，这些数组是难以区分的：

There's no distinction between that array and one which has explicitly been set with zero values. For example, these arrays are indistinguishable:

int[] x = { 0, 0, 0 };
int[] y = new int[3];

Java中的数组总是有固定大小 - 通过长度访问字段。没有当前使用的阵列数量的概念。

Arrays in Java always have a fixed size - accessed via the length field. There's no concept of "the amount of the array currently in use".

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