Number of elements of an array [closed]

1. How do you count the number of elements in an array?
2. Why is array o 1?
3. How many elements can be stored in an array?

How do you count the number of elements in an array?

//Number of elements present in an array can be calculated as follows. int length = sizeof(arr)/sizeof(arr[0]);

Why is array o 1?

Why the complexity of fetching value is O(1)? As Arrays are allocated contiguously in memory, Fetching a value via an index of the array is an arithmetic operation. All arithmetic operations are done in constant time i.e., O(1).

How many elements can be stored in an array?

The theoretical maximum Java array size is 2,147,483,647 elements. To find the size of a Java array, query an array's length property. The Java array size is set permanently when the array is initialized. The size or length count of an array in Java includes both null and non-null characters.