Local variables

• To meet temparary requirements of the programer some times we have to

 create variables inside method or block or constructor such type of variables 

are called as local variables

•  Local variables also known as stack variables or automatic variables or temparary

   variables

•  Local variables will be stored inside a stack

• The local variables will be created while executing the block in which we 

 declared it & destroyed once the block completed .Hence, The scope of local variable is

exactly same as the block in which we declared it.

Ex:-

               class Test

               {

              public static void main(String[] args)

              {

              int i=0;

              for(int j=0;j<3;j++)

              {

              i=i+j;

              }

             System.out.println(i+"-------------"+j);

              }

              }

Here we will get compile time error 

like this: Can't find symbol , Symbol:varible J, Location: class Test

• For the local variables JVM won't provide any default values 

compulsary we should perform initialization explicitly , before using that varible

Ex:- Class Test{

         public static void main(String args[])

         {

      int x;

     System.out.println("Hello");

        }

 }

O/P: Hello

Let's see another example

class Test2{

public static void main(String args[])

{

int x;

System.out.println(x);

}

}

In this class Test2 example we will get compile time error why because we are not initialized variable x

we should initialize before we using it.

Note:-

• It is not recommended to perform initialization of local variables

inside logical blocks because there is no garantee execution of 

these blocks at run time

• It's Highly recommended to perform initialization for the local variables at the 

time of declaration, at least with default values

• The only applicable modifier for the local variables is "final" if we are

using any other modifier we will get compile time error