No, as for an abstract method we have to provide implementation in subclass. To do this abstract method have to be overridden but final methods cannot be overridden. Example abstract class Show{ //abstract final method declaration abstract final void show(); } public class Main extends Show { public static void main(String[] args) { System.out.println("Hello World"); … Read more

Static, final, abstract and synchronized are considered as Non access modifiers in java. static: It is used to represent the class members. It can be used with variable, method, initializer block and nested class. final: It is used to restrict the further modification of instance variables, local variables , methods and classes. abstract: abstract is … Read more

Yes, Static members are also inherited to sub classes in java. package com.w3schools;   class A{ static int num = 20; static void method() { System.out.println("Static Method"); } }   class B extends A{ }   public class Test { public static void main(String args[]){ //Calling inherited static method B.method();   //printing inherited static field. … Read more

Sub class field will hide the Super class field. Hidden super class field in sub class can be accessed using super keyword. Example class Show { int num = 150; }   class Display extends Show { int num = 250;   public void display(){ System.out.println("num of subclass = " + num); System.out.println("num of super … Read more

No, a class cannot extend itself in java. Example public class Main extends Main { String name = "Jai"; int rollNo = 11; void show(){ System.out.println(name); System.out.println(rollNo); } public static void main(String[] args) { Main object = new Main(); object.show(); } }public class Main extends Main { String name = "Jai"; int rollNo = 11; … Read more

We can restrict a member of a class from inheriting to it’s sub classes by declaring the member as a private. Because, private members are not inherited to sub classes. Example class Student { String name = "Jai"; private int rollNo = 11; } public class Main extends Student { void show(){ System.out.println(name); System.out.println(rollNo); } … Read more

interface cannot have constructor in java, because interface not have any instance member so nothing to construct. Now the question comes how interface can be inherited without constructor because subclass constructor call super class constructor. We have two cases here. First case, interface extends other interface: in this situation there is no issue because as … Read more

interfaces not inherited from object class and there’s no common or root interface which implicitly inherited by all interfaces either. Note: For each public method in Object class, there’s an implicit abstract and public method declared in each interface which doesn’t have direct super interfaces. This standard is defined by JLS (Java Language Specification) as … Read more

Multiple inheritance in java can be achieved by following ways: A class can implements multiple interfaces. An interface can extends multiple interfaces. Example interface DisplayAge{ void displayAge(int age); }   interface DisplayName{ void displayName(String name); }   public class Test implements DisplayAge, DisplayName{   @Override public void displayAge(int age) { System.out.println("Age = " + age); … Read more

In java, multiple inheritance is not supported because of ambiguity problem. We can take the below example where we have two classes Class1 and Class2 which have same method display(). If multiple inheritance is possible than Test class can inherit data members (properties) and methods (behaviour) of both Class1 and Class2 classes. Now, Test class … Read more