ObjectSort.java

import javax.print.DocFlavor;
import java.util.*;

public class ObjectSort {
 public static void main(String[] args) {
 Student [] arr = new Student[4];
 arr[0] = new Student("aa",80);
 arr[1] = new Student("bb",90);
 arr[2] = new Student("cc",60);
 arr[3] = new Student("dd",85);

 Arrays.sort(arr);

 for (Student s : arr){
 System.out.println(s.name);
 }
 }
}

class Student implements Comparable<Student> {
 String name;
 int marks;

 public Student(String name, int marks) {
 this.name = name;
 this.marks = marks;
 }

 @Override
 public int compareTo(Student o) {
 if (this.marks > o.marks){
 return 1;
 } else if (this.marks < o.marks) {
 return -1;
 }
 return 0;
 }
}