Session 5:-Role of Methods in java.

         Method

• Method is nothing but a function it has functionality.
• Functionality like printing message or it called be difficult functionality like user authentication.
•  Ex: " hello java" ,User Logic:( 12+34,43-21...etc).
• Method can accept parameter/argument we called as input parameter (I/P).
• If any method returning some value than data type of method is the returning values data type.
•  If method does not return any value than data type is void.
• return statement is last executable statement.
• Variable inside the method is called as the local variable. Local variable must be initializing before the use and it scope is within a method.

NOTE:-Method name must be start with small later (Industry Standard).

 

• Advantage:-
  • Methods are reusable.
  • We can pass dynamic value at the  calling method.
  • We have individual choice of calling method based on the requirement.
  • We can’t define one method inside the other method.
   Syntax:-

                 Access Specifier /modifier   data-type method-Name (parameter/argument)

                    {

                        // coding

                    }

         

          Example :-

         Public void JNext() 

          { 

            Public void training (){ 

         // Compilation error, we can’t define one method inside the other method. 

           } 

          Public void development (); 

          // we can call another method but we can’t define one method inside the other method...!! 

          }

         

         Example :-

        

           public class Run{
           public static void main(String args[]){
           Math m=new Math();
            m.addNum(); //  Invoke addNum()

          } } 

           public class Math{
          void addNum()
         {
         int a=20; // local variable a
         int b=25; // local variable b
         int c=a+b; // logical statement
        System.out.println(c); // printing statement.
        int d=a-b;

        int f=a*b;
        System.out.println(d);
        System.out.println(f);
         } }

        Output:45,-5,500