Sort Objects with a Comparator in Java

PROBLEM UNDERSTANDING

Input and expected output

No input required

Ravi 91
Asha 82

COMPLETE JAVA 17 PROGRAM

Complete Java 17 implementation

import java.util.*;

class Main {
    public static void main(String[] args) throws Exception {
        record Student(String name,int mark){}
        List<Student> students=new ArrayList<>(List.of(new Student("Asha",82),new Student("Ravi",91)));
        students.sort(Comparator.comparingInt(Student::mark).reversed());
        for(Student student:students)System.out.println(student.name()+" "+student.mark());
    }
}

PROGRAM EXPLANATION

Algorithm and explanation

1. Initialize the deterministic sample values used for sort objects with a comparator in java.
2. Create the required object and apply Comparator and Method reference to its state or behavior.
3. Print the final result and compare it with the documented sample output.

This Java 17 example demonstrates Comparator and Method reference through a complete, executable program. The values are intentionally small so students can trace each statement, verify the output, and then modify the example safely in the online compiler.

EFFICIENCY

Time and space complexity

DEBUGGING CHECKLIST

Common mistakes

Try it yourself