Types of Variable and Type Casting

There are three types of variables in java local variable instance variable static variable

Local Variable

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

Instance Variable

A variable that is declared inside the class but outside the method is called instance variable .

Static variable

A variable that is declared as static is called static variable. It cannot be local. Type Casting  Assigning a value of one type  to a variable  of another type is known as Type Casting. Type Casting is classified into two category : Widening or implicit casting       Narrowing or explicit casting       Examples of implicit type casting    Class ImplicitTypeCasting{                      public static void main(String args[])                       {                              int i=100;                              long l =i; //implicit type conversion                              float f=l; //implicit type conversion                             System.out.println("Int value: "+i);                             System.out.println("Long value: "+l);                             System.out.println("Float value: "+f);                       }  } output:             Int value: 100             Long value: 100             float value: 100.0   Example of explicit type casting    Class ExplicitTypeCasting{                      public static void main(String args[])                       {                              double d=100.04;                              long l =(long)d; //explicit type conversion                              int i =(int)l; //explicit type conversion                             System.out.println("Double value: "+d);                             System.out.println("Long value: "+l);                             System.out.println("Int value: "+i);                       }  }    output:             Double value: 100.04             Long value: 100             Int value: 100