Java 8 lambda expression comparator

Lambda expression is used to provide the implementation of functional interface.

Java Lambda Expression Syntax

(argument-list) -> {function-body}

Where:
Argument-list: It can be empty or non-empty as well.
Arrow notation/lambda notation: It is used to link arguments-list and body of expression.
Function-body: It contains expressions and statements for lambda expression.

Example

package com.w3spoint;
 
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
 
class Student{
	int rollNo;
	String name;
 
	public Student(int rollNo, String name){
		super();  
        this.rollNo = rollNo;  
        this.name = name;  
	}
}
 
public class LambdaExpressionExample {
   public static void main(String args[]){
	List<Student> list=new ArrayList<Student>();  
 
	//Adding Students   
        list.add(new Student(1,"Nidhi"));  
        list.add(new Student(3,"Parbhjot"));  
        list.add(new Student(2,"Amani"));  
 
        System.out.println("Sorting on the basis of name...");  
 
        // implementing lambda expression  
        Collections.sort(list,(p1,p2)->{  
        return p1.name.compareTo(p2.name);  
        });  
        for(Student student:list){  
            System.out.println(student.rollNo+" "+student.name);  
        }  
   }
}

Output

Sorting on the basis of name...
2 Amani
1 Nidhi
3 Parbhjot

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