1import java.util.ArrayList;
2import java.util.Collections;
3import java.util.Comparator;
4 
5class Student implements Comparable<Student> {
6 
7    int id;
8    String name;
9    double marks;
10 
11    public Student(int id, String name, double marks) {
12        this.id = id;
13        this.name = name;
14        this.marks = marks;
15    }
16 
17    @Override
18    public int compareTo(Student other) {
19        return this.name.compareTo(other.name);
20    }
21 
22    @Override
23    public String toString() {
24        return id + " | " + name + " | " + marks;
25    }
26}
27 
28public class ComparableComparatorExample {
29 
30    public static void main(String[] args) {
31 
32        ArrayList<Student> students = new ArrayList<>();
33 
34        students.add(new Student(101, "Rahul", 85.5));
35        students.add(new Student(102, "Ankit", 92.0));
36        students.add(new Student(103, "Priya", 78.5));
37        students.add(new Student(104, "Sneha", 88.0));
38 
39        Collections.sort(students);
40 
41        System.out.println("Sorted by Name:");
42 
43        for (Student student : students) {
44            System.out.println(student);
45        }
46 
47        students.sort(Comparator.comparingDouble(student -> student.marks));
48 
49        System.out.println("\nSorted by Marks:");
50 
51        for (Student student : students) {
52            System.out.println(student);
53        }
54    }
55}