How can we retrieve the number of elements in an array in Java?

You can use the length property of an array to obtain the number of elements in the array.

For example, for an array arr, you can use arr.length to obtain the number of elements in the array.

Here is an example code:

int[] arr = {1, 2, 3, 4, 5};
int count = arr.length;
System.out.println("数组中元素的个数为：" + count);

The output result is:

数组中元素的个数为：5