All arrays in Java are objects.
You can create an array object using the new operator.
The general syntax for array creation expression is as follows:
Creates an array object of type ArrayDataType of ArrayLength length
For example, you can create an array to store five int ids as follows:
5 is the length of the array, which is also called the dimension of the array.
The above expression creates an array object in memory, which allocates memory to store five integers.
To store the array object reference in empId, you can write
empId = new int;
You can combine the declaration of an array and its creation in one statement as
int empId = new int;
You can use an expression to specify the length of an array while creating the array.
int total = 3; int array1 = new int[total]; // array1 has 3 elements int array2 = new int[total * 3]; // array2 has 9 elements
Because all arrays are objects, their references can be assigned to a reference variable of the Object type.
int empId = new int; // Create an array object Object obj = empId; // A valid assignment
Assume that obj is a reference of the Object type that holds a reference of int
int tempIds = (int)obj;