this() constructor call, Real Utilization

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Program

 class Studentclass{
int rollno;
String name,course;
float age;

Studentclass(int rollno,String name,String course){
this.rollno=rollno;
this.name=name;
this.course=course;
}

Studentclass(int rollno,String name,String course,float age){
this(rollno,name,course);//reusing constructor
this.age=age;
}

void display(){
	System.out.println(rollno+" "+name+" "+course+" "+age);
	}
}

class MainClassOfStudent{
public static void main(String args[]){

	Studentclass obj1=new Studentclass(111,"RAHIM","C");
	Studentclass obj2=new Studentclass(112,"RAM","java",21.5f);
	obj1.display();
	obj2.display();
	}
}

/* The this() constructor call should be used to reuse the constructor
from the constructor. It maintains the chain between the constructors
i.e. it is used for constructor chaining. Let's see the example given
below that displays the actual use of this keyword.
*/

Output

111 RAHIM C 0.0
112 RAM java 21.5
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