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Dec 15, 2023 · The super keyword in Java is a reference variable that is used to refer to parent class when we’re working with objects. You need to know the basics of Inheritance and Polymorphism to understand the Java super keyword. The Keyword “super” came into the picture with the concept of Inheritance.
- 12 min
Learn how to use super keyword in Java to refer parent class variables, methods and constructors. See examples of super keyword in inheritance, overriding and polymorphism.
Learn how to use the super keyword in Java to call superclass methods and access superclass constructors. See examples of super in inheritance and polymorphism.
- Method overriding. class Animal { // overridden method public void display(){ System.out.println("I am an animal"); } } class Dog extends Animal { // overriding method @Override public void display(){ System.out.println("I am a dog"); } public void printMessage(){ display(); } } class Main { public static void main(String[] args) { Dog dog1 = new Dog(); dog1.printMessage(); } }
- super to Call Superclass Method. class Animal { // overridden method public void display(){ System.out.println("I am an animal"); } } class Dog extends Animal { // overriding method @Override public void display(){ System.out.println("I am a dog"); } public void printMessage(){ // this calls overriding method display(); // this calls overridden method super.display(); } } class Main { public static void main(String[] args) { Dog dog1 = new Dog(); dog1.printMessage(); } }
- Access superclass attribute. class Animal { protected String type="animal"; } class Dog extends Animal { public String type="mammal"; public void printType() { System.out.println("I am a " + type); System.out.println("I am an " + super.type); } } class Main { public static void main(String[] args) { Dog dog1 = new Dog(); dog1.printType(); } }
- Use of super() class Animal { // default or no-arg constructor of class Animal Animal() { System.out.println("I am an animal"); } } class Dog extends Animal { // default or no-arg constructor of class Dog Dog() { // calling default constructor of the superclass super(); System.out.println("I am a dog"); } } class Main { public static void main(String[] args) { Dog dog1 = new Dog(); } }
Sep 22, 2010 · The super keyword in Java is a reference variable that is used to refer to the immediate parent class object. Usage of Java super Keyword. super can be used to refer to the immediate parent class instance variable. super can be used to invoke the immediate parent class method.
Jun 10, 2024 · In java, super keyword is used to access methods of the parent class while this is used to access methods of the current class. this keyword is a reserved keyword in java i.e, we can’t use it as an identifier. It is used to refer current class’s instance as well as static members. It can be used in various contexts as given below:
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Jan 8, 2024 · Learn how to use the super keyword to access the parent class in Java. See examples of constructors, variables, and method overriding with super.
