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Private and final methods in Java

  • Difficulty Level : Easy
  • Last Updated : 27 May, 2017

When we use final specifier with a method, the method cannot be overridden in any of the inheriting classes. Methods are made final due to design reasons.
Since private methods are inaccessible, they are implicitly final in Java. So adding final specifier to a private method doesn’t add any value. It may in-fact cause unnecessary confusion.




class Base {
  
   private final void foo() {}
  
   // The above method foo() is same as following. The keyword 
   // final is redundant in above declaration.
  
   // private void foo() {}
}

For example, both ‘program 1’ and ‘program 2’ below produce same compiler error “foo() has private access in Base”.

Program 1




// file name: Main.java
class Base {
    private final void foo() {}
}
   
class Derived extends Base {
    public void foo() {} 
}
   
public class Main {
    public static void main(String args[]) {
        Base b = new Derived();
        b.foo();
    }
}

Program 2




// file name: Main.java
class Base {
    private void foo() {}
}
   
class Derived extends Base {
    public void foo() {} 
}
   
public class Main {
    public static void main(String args[]) {
        Base b = new Derived();
        b.foo();
    }
}

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

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