Arrays

Introduction

• Arrays store multiple variables of the same type.
• The array itself is always an object on the heap (even if it is storing primitive elements).

Declaring

• int[] scores; (Preferred) or int scores[]; (Legal, but bad)
• String[] names;
• int[][] matrix;

Constructing

• int[] scores = new int[10];
• This will create a new array object on the heap. All the int values will be assigned their default values, Object references will be assigned null.
• The array size must be present, when there is no initializer.
• double[] rates = new double[]; //illegal
• Thread[] pool = new Thread[10]; //No thread objects are created here, only the array object to hold ten thread references is created.