variable must be declared with a data type

We can change data type after bdeclared

يعتبر int

Variable : a location in main memory that holds only onevalue of a particular data type at , but that value can not be changed

int n;
n=n+10;
كم قيمه n

We can use Access modifiers with Local Variables

java.lang

Collection : Java library class, like . ArrayList that represents a group of objects.

ArrayList<String> animals = new ArrayList<>();
animals.clear ();

Instantiate
عباره عن

Information hiding : The practice of making instance variables private to limit dependencies between classes

method that returns the value of an instance variable .

method that assigns a value to an instance variables