super() keyword important behavior

Java Programming Language Class, Object and Methods in java (Article) Class, Object and Methods in java (Program)

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Program:

class Student{
int id;
String name;
	Student(int id,String name){
	this.id=id;
	this.name=name;
	}
}

class Child extends Student{
int roll;
	Child(int id,String name,int roll){
	super(id,name);//reusing parent constructor
	this.roll=roll;
	}
void display(){
	System.out.println(id+" "+name+" "+roll);
	}
}

class SuperKeyword {
public static void main(String[] args){
Child e1=new Child(1,"Rahim",12);
e1.display();
}}

Output:

1 Rahim 12
Press any key to continue . . .

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