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What is the difference between super and this, keywords in Java?
The this is a keyword in Java which is used as a reference to the object of the current class. Using it you can −
- Differentiate the instance variables from local variables if they have same names, within a constructor or a method.
- Call one type of constructor (parametrized constructor or default) from other in a class. It is known as explicit constructor invocation.
Example
class Superclass {
int age;
Superclass(int age) {
this.age = age;
}
public void getAge() {
System.out.println("The value of the variable named age in super class is: " +age);
}
}
The super is a keyword in Java which is used as a reference to the object of the super class. Like the this keyword −
- 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.
Example
class Superclass {
int age;
Superclass(int age) {
this.age = age;
}
public void getAge() {
System.out.println("The value of the variable named age in super class is: " +age);
}
}
public class Subclass extends Superclass {
Subclass(int age) {
super(age);
}
public static void main(String argd[]) {
Subclass s = new Subclass(24);
s.getAge();
}
}
Output
The value of the variable named age in super class is: 24
Updated on: 30-Jul-2019
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