DATA TYPES, VARIABLES & ARRAYS

• VARIABLE

Variables are locations in memory that can hold values. Before assigning any value to a variable, it must be declared.

• KINDS OF VARIABLES IN JAVA AND THEIR USES

Java has three kinds of variables namely, the instance variable, the local variable and the class variable.
Local variables are used inside blocks as counters or in methods as temporary variables and are used to store information needed by a single method.

Instance variables are used to define attributes or the state of a particular object and are used to store information needed by multiple methods in the objects.

Class variables are global to a class and to all the instances of the class and are useful for communicating between different objects of all the same class or keeping track of global states.

• VARIABLES DECLARED

Variables can be declared anywhere in the method definition and can be initialized during their declaration.They are commonly declared before usage at the beginning of the definition. Variables with the same data type can be declared together. Local variables must be given a value before usage.

• VARIABLE TYPE

Variable types can be any data type that Java supports, which includes the eight primitive data types, the name of a class or interface and an array.

• ASSIGNING A VALUE TO VARIABLE

Values are assigned to variables using the assignment operator =.

• LITERALS AND ITS TYPE

A literal represents a value of a certain type where the type describes how that value behaves.
There are different types of literals namely number literals, character literals, boolean literals, string literals,etc.

• ARRAY AND ITS DECLARATION

An array is an object that stores a list of items.

Array variable indicates the type of object that the array holds. 

Ex: int arr[];

• JAVA BOOLEAN

Boolean data type is used to mention the variables which will only have the possibility of containing values either as True or False.

THERE ARE SOME SNAPSHOTS OF SOME DATA TYPE

JAVA INTEGER TYPE

JAVA CHARACTERS

JAVA FLOATING