java - Java中的数组长度(Array Length in Java)

Question

I declared an array as shown below:

(我声明了一个数组，如下所示：)

int[] arr = new int[10];

Then I assigned following values to the array:

(然后我为数组分配了以下值：)

arr[0] = 1;
arr[1] = 2;
arr[2] = 3;
arr[3] = 4;

Then I declared and initialized an integer variable:

(然后我声明并初始化了一个整数变量：)

int arrayLength = arr.length;

This will be useful to find actual size but is there any method to find logical size of the array?

(这对于查找实际大小很有用，但有没有找到数组逻辑大小的方法？)

  ask by Kiran Bhat translate from so

Answer 1

It contains the allocated size, 10 .

(它包含分配的大小， 10 。)

The unassigned indexes will contain the default value which is 0 for int .

(未分配的索引将包含默认值，对于int ，该值为0 。)