Java: Using Super()

package constructorDemo;

 public class Superclass {

public int rollno;
public String name;

Superclass(int rollnolocal, String namelocal) {

rollno = rollnolocal;
name = namelocal;

}

}

package constructorDemo;

class subclass extends Superclass {

public int classnum;

public String subject;

subclass(int rollnolocal, String namelocal,int classnumlocal,String subjectlocal) {

super(rollnolocal,namelocal);

classnum = classnumlocal;

subject= subjectlocal;

System.out.println("Roll num is:"+rollno +" Name is "+name+ "Classnum is "+classnum+" Subject is "+subject);

}