Demo of Comparable Interface

// Define a class representing a Student

class Student implements Comparable<Student> {
    private String name;
    private int age;

  public Student(String name, int age) {
      this.name = name;
      this.age = age;
  }
  
  public String getName() {
      return name;
  }
  
  public int getAge() {
      return age;
  }
  
  // Implement the compareTo method for natural ordering
  @Override
  public int compareTo(Student other) {
      // Compare students based on their ages
      return Integer.compare(this.age, other.age);
  }
  
  @Override
  public String toString() {
      return "Student{" +
              "name='" + name + '\\'' +
              ", age=" + age +
              '}';
    }
}

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class ComparableDemo {
    public static void main(String[] args) {
        List<Student> students = new ArrayList<>();
        students.add(new Student("Kevin", 20));
        students.add(new Student("Scott", 18));
        students.add(new Student("Everett", 22));
        
      System.out.println("Before sorting:");
      for (Student student : students) {
          System.out.println(student);
      }
  
      // Sort students based on natural ordering (age)
      Collections.sort(students);
  
      System.out.println("\\nAfter sorting:");
      for (Student student : students) {
          System.out.println(student);
      }
  }
}