Not getting proper result after using compareTo()

[Maximiliano2]

Hello everybody, I am having an issue with the role beyond compareTo(). I create a Student class that implements the Comparable interface. The following is the sample of code :

class Student implements comparable {<Student> 
private String name; 
private int age; 
// Constructor 
// Setters and Getters 
public int compareTo (Student E) { 
return name.compareTo (E.get Name ());}// this method does work and throws compilation error

but when
public int compareTo (Student E) {
return Age.compareTo (E.getAge it gives me an error ());}
Thank you

[RichiRich]

According to me, Age is an int is a primitive type, it does not compareTo(). return to age - E.getAge(). Watch your way to code, the standards require that the class variables and methods begin with a lowercase letter. Many times there are some minute mistakes due to which you get compilation error. Otherwise compareTo is used to sort these types of objects in the lists more often. If you still getting problem, feel free to write.

[Timothi]

You should do:

public int compareTo (Student e) {return (age-e.getAge ());}

For method Collections.sort (), you just pass it a list of students like your class implements the Comparable interface:

Collections.sort (studentslist);

Hope that you will get some hints from this. If not then try some R & D. till you succeed.