Final Keyword in Java

In this tutorial, we will learn about the Final Keyword in Java in Java. How to use them with the help of examples.

Define Final Keyword in Java

The final keyword is use for making data, method and class as constant. Final keyword is use to denote constants. Once any entity is declare final, it can be assign only once.

The following are different contexts where final is use

• Variable
• Method
• Class

Variable

When we use final keyword with data declaration then the data will be constant it means we cannot increase or decrease the data.

Example of Variable in Final Keyword

Let’s run the code

Method

When we use final keyword with method then method become constant. It means final method cannot be override.

Example of Method in final keyword

Let’s run the code

Class

When we use final keyword with class then class became constant and this class cannot be extends using extends keyword with other class (derived class) (final class cannot be inherited).

Example of Class in Final Keyword

Let’s run the code

Method Overloading in Java

Method Overloading allows different methods to have the same name, but different parameters is know as overloaded methods. This feature is know as method overloading. Method Overloading is not possible by changing the return type of the method only.

There are two overload the method

• Changing number of arguments
• Changing the data type

Changing number of arguments

Example

Input Value

class Main {
    static int add(int a,int b){return a+b;}  
     static int add(int a,int b,int c){return a+b+c;}  
}  
class abms{  
public static void main(String[] args){  
System.out.println(Main.add(33,44));  
System.out.println(Main.add(55,66,77));  
}
  }
  

Example of Changing number of arguments

Changing the data type

Example

Input Value

class Main {
    static int add(int a, int b){return a+b;}  
    static double add(double a, double b){return a+b;}  
}  
class abms{  
public static void main(String[] args){  
System.out.println(Main.add(15,15));  
System.out.println(Main.add(18.52,18.85));  
}
  }
  

Example of Changing the data type

Let’s run the code

Output Value

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