Java List sort() Method

The sort() method of List Interface sorts the given list according to the order specified in the comparator. The list must be modifiable else it will throw an exception.

Syntax

Parameters

The parameter 'c' represents the Comparator used to compare list elements. And for null values, natural ordering is used.

Return

Throws:

ClassCastException- If the list contains elements that are not mutually comparable using the comparator

UnsupportedOperationException- If the list's list-iterator does not support the sort operation

IllegalArgumentException- If the comparator is found to violate the Comparator protocols.

Example 1

import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
public class JavaListSubListExample3 {
public static void main(String[] args) {
        List<String> list= new LinkedList<>();
list.add("Renu");
list.add("Heera");
list.add("Vijay");
list.add("Geetanjali");
System.out.println("List : "+list);
//will sort the string acc to the alphabets
Collections.sort(list);
System.out.println("Sorted List : "+list);
    }
}

Test it Now

Output:

List : [Renu, Heera, Vijay, Geetanjali]
Sorted List : [Geetanjali, Heera, Renu, Vijay]

Example 2

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

class Employee {

int id;
    String name;

public Employee(int id, String name) {
this.id = id;
this.name = name;
    }
public String toString()
    {
return this.id + " " + this.name ;

    }
}
class SortById implements Comparator<Employee> {
// Used for sorting in ascending order of ID
public int compare(Employee a, Employee b)
    {
return a.id - b.id;
    }
}

// Main class
class JavaListSubListExample2 {
static int i=1;
public static void main (String[] args) {
        List<Employee> list = new ArrayList<Employee>();
        Employee employee1 = new Employee(15019, "Patanjali");
        Employee employee2 = new Employee(13198, "Geetanjali");
        Employee employee3 = new Employee(12112, "Anjali");
list.add(employee1);
list.add(employee2);
list.add(employee3);
System.out.println("Unsorted List : ");
for (Employee val : list) {
System.out.println(i++ +". "+val);
        }
Collections.sort(list, new SortById());
System.out.println();
System.out.println(" Sorted List : ");
int i=1;
for (Employee val : list) {
System.out.println(i++ +". "+val);
        }
    }
}

Test it Now

Output:

Unsorted List :
1. 15019 Patanjali
2. 13198 Geetanjali
3. 12112 Anjali

 Sorted List :
1. 12112 Anjali
2. 13198 Geetanjali
3. 15019 Patanjali

Next TopicJava List

← prev next →

Latest Courses

We provides tutorials and interview questions of all technology like java tutorial, android, java frameworks

Contact info

G-13, 2nd Floor, Sec-3, Noida, UP, 201301, India

[email protected].

Python

AI, ML and Data Science

Java

B.Tech and MCA

Web Technology

Software Testing

Technical Interview

Java Interview

Web Interview

Database Interview

Company Interviews

Java Tutorial

Control Statements

Java Object Class

Java Inheritance

Java Polymorphism

Java Abstraction

Java Encapsulation

Java Array

Java OOPs Misc

Java String

Java String Methods

Java Regex

Exception Handling

Java Inner Class

Java Multithreading

Java Synchronization

Java Networking

Java Applet

Java Reflection

Java Conversion

Java JDBC

RMI

Internationalization

Java Array Class

Java AtomicInteger Class

Java AtomicLong Methods

Java Authenticator

Java BigDecimal class

Big Integer Class

Java Boolean class

Java Byte Class

Java Class

Java Collections class

Java Compiler Class

CopyOnWriteArrayList

Java Math Methods

LinkedBlockingDeque

Java Long class

LinkedTransferQueue

Java List

Java MulticastSocket

Java Number Class

Java Phaser Class

ArrayList Methods

Java Thread Methods

Java Projects

Java Programs

Java Misc

Java Date Class

Java ListIterator Class

Java NIO Tutorial

HttpURLConnection

Java Deque

Java HttpCookie Class

Java URL class

Java List Methods

Java Vector class

Java Collection Methods

Java Socket Class

Java Executors