Array Length in Java

Question

I declared an array as shown below:

int[] arr = new int[10];

Then I assigned following values to the array:

arr[0] = 1;
arr         


        

Answer 1

In this case, arr.length will return 10, the size of array you allocated. Logical size doesn't really apply here, as this is a fixed length array.

When you initialize the array:

int[] arr = new int[10];

Java will create an array with 10 elements and initialize all of these to 0. See the Java language spec for details of initial values for this and other primitive types.