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.age=age;
this(rollno,name,course);//Compile Time Error: Call to this must be first statement in constructor
}
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();
}
}
/*
Note: Call to this() must be the first statement in constructor.
otherwise it will give Compile Time Error:
*/
C:\Users\Rumman Ansari\Documents\MainClassOfStudent.java:14: error: call to this must be first statement in constructor
this(rollno,name,course);//Compile Time Error: Call to this must be first statement in constructor
^
1 error
First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.
Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.