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Can You Override Non-public Methodology in Java? Inside Class?


No, you can’t override personal strategies in Java, personal strategies are non-virtual in Java and entry in another way than non-private one. Since methodology overriding can solely be executed on derived class and personal strategies are usually not accessible in a subclass, you simply cannot override them. By the best way, yet another chance of overriding personal strategies in an internal class, since personal strategies are accessible in an internal class, and that’s why it is without doubt one of the tough java interview questions. Anyway, this may also not work as a result of personal strategies are bonded throughout compile time and solely Kind (or Class) is used to find a non-public methodology.

For Instance in beneath code the place it appears like that
nested class is an overriding personal methodology, however if you happen to name privateMethod() with a kind of tremendous class however the object of the subclass, it is going to solely execute privateMethod() declared within the guardian class, which isn’t precisely methodology overriding. 

Had the personal methodology overridden that it will have known as methodology from youngster class. By the best way, compiler is not going to complain, it is going to deal with methodology with very same signature in youngster class as separate methodology, and this is called methodology hiding in Java.

Ought to You Make Non-public methodology Closing in Java?

That is one other widespread doubt amongst Java programmers, utilizing remaining and personal methodology in Java is an efficient alternative, however I do not assume it provide any profit when it comes to efficiency. Quite, this resolution needs to be taken on the idea of design, performance and making certain readability of code. 

Since making a technique remaining,  simply restrict it’s capability to be overridden, it would not make a lot sense to mark a non-public methodology as remaining in Java, as a result of personal methodology cannot overridden in Java by any means. So compiler will certainly carry out form of optimization it will possibly e.g. inlining or caching it. 


By the best way, personal key phrase is without doubt one of the elementary entry modifier and could be utilized to variables, strategies and sophistication, let’s see a number of the price understanding truth about personal key phrase in Java

Can You Override Private Method in Java? Inner Class?

Necessary Factors about personal key phrase in Java

1. You’ll be able to apply personal entry modifier fields, strategies and any internal class in Java. It’s most restricted entry modifier and solely accessible within the class they’re declared. They aren’t seen outdoors the category and accessing them outdoors will end in compile time error.

2.Prime degree Lessons cannot be personal in Java. They will solely be both public or with none entry modifier i.e. solely accessible within the package deal they’re declared. In case of public class, title of Java supply file should match with the title of public class.
3.Although personal strategies or variables are usually not accessible outdoors of  the category, they’re declare. They are often accessed through reflection through the use of setAccessible(true) and altering there personal visibility. See this article for extra particulars.

4.As we now have seen on this article, personal strategies cannot be overridden in Java, not even inside nested or internal courses.

5.Non-public members runs quicker than non-private one, due to static binding. They’re additionally higher candidate for optimization from compiler as a result of they cannot be overridden.

Can private method be overridden in Java

Non-public Methodology Overriding Instance

With a view to show principle, we should see an instance. On this Java program, we now have declared a personal methodology and making an attempt to override them inside an Inside class. In primary methodology, we’re calling personal methodology through the use of reference variable of Outer class, which can also be guardian however pointing to object of sub class.  

Although it does present that personal methodology is accessible in Inside class, you simply cannot override them. Let’s see what does output exhibits.

/**
  * Java Program to reveal, personal methodology cannot be overridden in Java, 
  * not even on Inside courses. Major cause of that habits is as a result of they're bonded 
  * utilizing static binding in Java.
  */

 public class PrivateMemberExample {

    personal String i_m_private = "I'm personal member, not accessible outdoors this Class";

    personal void privateMethod() {
        System.out.println("Non-public methodology of Outer Class");
    }

    public static void primary(String args[]) {
        PrivateMemberExample outerClass = new PrivateMemberExample();
        NestedClass nc = outerClass.new NestedClass();
        nc.showPrivate(); //exhibits that personal methodology are accessible in internal class.
       
        outerClass = nc;
        outerClass.privateMethod(); // This is not going to name personal methodology from internal class,
                                    // which exhibits you can't override 
                                    // personal methodology inside internal class. 
    }

    class NestedClass extends PrivateMemberExample {

        public void showPrivate() {
            System.out.println("Accessing Non-public members of Outer class: " + i_m_private);
            privateMethod();
        }
       
       /*
        * personal methodology making an attempt to be overridden, 
        * as a substitute it’s simply hiding guardian class methodology.
        */
        personal void privateMethod() {
             System.out.println("Non-public methodology of Nested Class");
         }
    }
}


Output
Accessing Non-public members of Outer class: I'm personal member, not accessible outdoors this Class
Non-public methodology of Outer Class
Non-public methodology of Outer Class
 

From the output, it’s clear that each the decision to non-public methodology, which is made through the use of reference variable with the kind of guardian class end in invoking personal methodology from the guardian class, which can also be an outer class in our case. 

Had it was overridden, in case of second name, which is made utilizing object of Inside sub class, would end in execution of personal methodology of nested class. This proves that personal methodology cannot be overridden in Java, not in sub class and never even in Inside class.

That is all about query, Can we override personal methodology in Java?. We’ve got realized that this isn’t potential in Java. Although it is a actual robust Java query, particularly follow-up query which includes, Can we override personal methodology on Inside class in Java. It might probably confuse you, in case you are unsure about how personal strategies are bonded in Java. Let me know, if you happen to assume in any other case.

Associated Java Interview questions  from Java67 Weblog


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