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Difference between super() and this() in Java
Following are the notable differences between super() and this() methods in Java.
| super() | this() | |
|---|---|---|
| Definition | super() - refers immediate parent class instance. | this() - refers current class instance. |
| Invoke | Can be used to invoke immediate parent class method. | Can be used to invoke current class method. |
| Constructor | super() acts as immediate parent class constructor and should be first line in child class constructor. | this() acts as current class constructor and can be used in parametrized constructors. |
| Override | When invoking a superclass version of an overridden method the super keyword is used. | When invoking a current version of an overridden method the this keyword is used. |
Example
class Animal {
String name;
Animal(String name) {
this.name = name;
}
public void move() {
System.out.println("Animals can move");
}
public void show() {
System.out.println(name);
}
}
class Dog extends Animal {
Dog() {
//Using this to call current class constructor
this("Test");
}
Dog(String name) {
//Using super to invoke parent constructor
super(name);
}
public void move() {
// invokes the super class method
super.move();
System.out.println("Dogs can walk and run");
}
}
public class Tester {
public static void main(String args[]) {
// Animal reference but Dog object
Animal b = new Dog("Tiger");
b.show();
// runs the method in Dog class
b.move();
}
}
Output
Tiger Animals can move Dogs can walk and run
Updated on: 2020-06-21T12:42:48+05:30
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