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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.
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The super keyword in Java is a reference variable which is used to refer immediate parent class object. Whenever you create the instance of subclass, an instance of parent class is created implicitly which is referred by super reference variable.
The super keyword refers to superclass (parent) objects. It is used to call superclass methods, and to access the superclass constructor. The most common use of the super keyword is to eliminate the confusion between superclasses and subclasses that have methods with the same name.
- 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 11, 2022 · The super keyword refers to the objects of immediate parent class. Before learning super keyword you must have the knowledge of inheritance in Java so that you can understand the examples given in this guide.
- When you have a variable in child class which is already present in the parent class then in order to access the variable of parent class, you need...
- When we create the object of sub class, the new keyword invokes the constructor of child class, which implicitly invokes the constructor of parent...
- When a child class declares a same method which is already present in the parent class then this is called method overriding. We will learn method...
Jun 10, 2024 · super keyword. super is a reserved keyword in java i.e, we can’t use it as an identifier. super is used to refer super-class’s instance as well as static members. super is also used to invoke super-class’s method or constructor.
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Sample Code. The program given in this section demonstrates how to use the super keyword to invoke the parametrized constructor of the superclass.
