Data Types and variables in Java

Data Types

• The term data type refers to the type of data that can be stored in a variable.
• Sometimes,java is called a "strongly typed language"because when you declare a variable,you must specify the variable's type.
• Then the compiler  ensures that you don't try to assign data of the wrong type to the variable. 

Variables

Variable is name of reserved area allocated in memory

There are 3 types of  variables in Java

1. Local variable
2. Static variable
3. Instance Variable.

Local Variable

A variable that is declared inside the method is called local variable.

Static Variable

A variable that is declared as static is called static variable. It cannot be local.

Instance Variable
A variable that is declared inside the class but outside the method is called instance variable.
It is not declared as Static.

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