When can you use the super() keyword? java

Variables and methods of super class can be overridden in subclass. In case of overriding , a subclass object call its own variables and methods. Subclass cannot access the variables and methods of superclass because the overridden variables or methods hides the methods and variables of super class. But still java provides a way to access super class members even if its members are overridden. Super is used to access superclass variables, methods, constructors. Super can be used in two forms : 1) First form is for calling super class constructor. 2) Second one is to call super class variables,methods. Super if present must be the first statement.

how to use super class method in java

class Parentclass
{
   //no-arg constructor
   Parentclass(){
	System.out.println("no-arg constructor of parent class");
   }
   //arg or parameterized constructor
   Parentclass(String str){
	System.out.println("parameterized constructor of parent class");
   }
}
class Subclass extends Parentclass
{
   Subclass(){
       /* super() must be added to the first statement of constructor 
	* otherwise you will get a compilation error. Another important 
	* point to note is that when we explicitly use super in constructor
	* the compiler doesn't invoke the parent constructor automatically.
	*/
	super("Hahaha");
	System.out.println("Constructor of child class");

   }
   void display(){
	System.out.println("Hello");
   }
   public static void main(String args[]){		
	Subclass obj= new Subclass();
	obj.display();	 
   }
}

Posted by: Guest on May-31-2021

Source

class Parentclass { //no-arg constructor Parentclass(){ System.out.println("no-arg constructor of parent class"); } //arg or parameterized constructor Parentclass(String str){ System.out.println("parameterized constructor of parent class"); } } class Subclass extends Parentclass { Subclass(){ /* super() must be added to the first statement of constructor * otherwise you will get a compilation error. Another important * point to note is that when we explicitly use super in constructor * the compiler doesn't invoke the parent constructor automatically. */ super("Hahaha"); System.out.println("Constructor of child class"); } void display(){ System.out.println("Hello"); } public static void main(String args[]){ Subclass obj= new Subclass(); obj.display(); } }

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