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Arrays :

• A table of values of the same type and a fixed size.
• Arrays are Java objects
• The table may have one or more dimensions.All Java arrays are technically one-dimensional. Two-dimensional arrays are arrays of arrays.
• Declaring an array does not create an array object or allocate space in memory; it creates a variable with a reference to an array
• Array variable declarations must indicate a dimension by using []

Elements :

The data within the array.

Index :

The position of a component in an array. The index must be of an ordinal type.

Example:

Given the array declaration in Java

// declare BUT no space allocated (no numbers allowed yet)
int[] marks;         // OR this:    int marks[]

// allocate space and allow numbers
marks[] = new int[10];  

// can be done in ONE line:
int[] marks = new int[10];

// may be able to add values in one step with initalizer list:
int marks[ ] = { 72, 44, 66, 87, 54, 85, 92, 65, 71, 63 };

marks

0

1

2

3

4

5

6

7

8

9

72

44

66

87

54

85

92

65

71

63