Aug 22, 2022by @kodeazy

How to sort a list of Objects using streams in Asc order in java?

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In this blog we will be discussing on how to sort list of objects in java using streams in Asc order.
To sort the list using streams we sort the list using Comparator function and we collect it as a list using collect function.

Below is an example syntax of sorting Objects using streams.

List<Empoyee> al=new ArrayList<Empoyee>();
al=al.stream().sorted(Comparator.comparingInt(Empoyee::getAge)).collect(Collectors.toList());

Below is an example code how to sort the ArrayList objects using streams in Asc order.

import java.util.*;
import java.util.stream.Collectors;
class SortObjectsUsingStream{
public static void main(String args[]){
    List<Empoyee> al=new ArrayList<Empoyee>();
    al.add(new Empoyee(27, 103, "Suresh"));
    al.add(new Empoyee(23, 102, "Ramesh"));
    al.add(new Empoyee(21, 105, "Mahesh"));
    al.add(new Empoyee(29, 104, "Gopi"));
    System.out.println("Sorting by Age");
        al=al.stream().sorted(Comparator.comparingInt(Empoyee::getAge)).collect(Collectors.toList());
    al.forEach(emplyeDetails->{
        System.out.println("Name is: "+emplyeDetails.name+" Age is :"+emplyeDetails.age+"Salary is "+emplyeDetails.salary);
    });
}
}
class Empoyee{
int age;
int salary;
String name;
Empoyee(int age,int salary,String name){
    this.age=age;
    this.salary=salary;
    this.name=name;
}
public int getAge(){
    return this.age;
}   
}

Output:

D:\java>javac SortObjectsUsingStream.java
D:\java>java SortObjectsUsingStream
Sorting by Age
Name is: Mahesh Age is :21Salary is 105
Name is: Ramesh Age is :23Salary is 102
Name is: Suresh Age is :27Salary is 103
Name is: Gopi Age is :29Salary is 104