How does one go about keeping track of items that have data while working with an array that is only half populated?

java - netbeans

Programming language: Processing from Java Question attached as photo Topic: Use of Patial- Full Arrays

An array int[] intArray can be initialized during its definition by A.) It can't be initialized B.) by writing int[] intArray = {1.0f}; C.) by writing int[] intArray = {0,1,2}; D.) by writing int[0-10] intArray = {0,1,2,3,4,5,6,7,8,9};

Return the First Element in an Array JavaScript Create a function that takes an array containing only numbers and return the first element. Examples getFirstValue ([1, 2, 3]) → 1 getFirstValue ([80, 5, 100])→ 80 getFirstValue ([-500, 0, 50])-500

A single dimensional array might be treated as a 2-dimensional array.

Is there a way to increase the size of an array after its declaration?