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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 Inheritanceand Polymorphism to understand the Java super keyword. The Keyword “super” came into the picture with the concept of Inheritance. In this article, we gonna covers all about ...
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1) super is used to refer immediate parent class instance variable. We can use super keyword to access the data member or field of parent class. It is used if parent class and child class have same fields. In the above example, Animal and Dog both classes have a common property color.
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. To understand the super keyword, you should have a basic ...
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- 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(); } }
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: to refer ...
The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available. See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.
Java - super keyword. The super keyword is similar to this keyword. Following are the scenarios where the super keyword is used. It is used to differentiate the members of superclass from the members of subclass, if they have same names. It is used to invoke the superclass constructor from subclass.
