Private abstract method in Java

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Private methods are private to the class only. They are not polymorphic in nature i.e. we cannot inherit them, so it makes no sense to make a private method abstract. Making a method abstract means we have to override and implement it in a subclass, but since we can’t override private methods, we can’t make them abstract either.

Example:

abstract class Display {
   private abstract void display();
}
 
public class Main extends Display {
    void display() {
         System.out.println("Inside display method");
    }
   public static void main(String args[]) {
     System.out.println("Inside main class");
   }
}

Output:

Main.java:9: error: illegal combination of modifiers: abstract and private
   private abstract void display();
                         ^
Main.java:12: error: Main is not abstract and does not override abstract method display() in Display
public class Main extends Display {
       ^
2 errors

Java interview questions on access modifiers