how to sort list of employee objects in java
In our case, the comparator is a lambda which. We'll define the following int arrays in a @Before jUnit method: @Before public void initVariables () { toSort = new int [] { 5, 1, 89, 255, 7, 88 . Here is code to test and sort person objects: Java Functional Interface Interview Q & A, Different Ways to Iterate over a List in Java [Snippet], Different Ways to Iterate over a Set in Java [Snippet], Different Ways to Iterate over a Map in Java [Snippet], Iterate over LinkedHashSet in Java Example, Remove First and Last Elements of LinkedList in Java, Iterate over LinkedList using an Iterator in Java, Search an Element in an ArrayList in Java, Iterate over ArrayList using Iterator in Java. Arrays; Linked List; Stack; Queue; Binary Tree; Binary . groupingBy () method is an overloaded method with three methods. Hi, I am Ramesh Fadatare. However, I am wondering what would be an elegant way to sort my objects in a given order, using this API. Let's look at a quick example to sort a list of strings. In the main () method, we've created an array list of custom objects list, initialized with 5 objects. API Testing The following example sort an array of employee objects in Ascending order: package com.java.array.tutorial.sorting ; import java.util.Arrays ; public class SortArray { public static void main ( String [] args) { // sort Array of employee objects using Comparator . Sort a list of objects using Comparator in Java. Python Convert String To Datetime tutorial deals with how to convert string datetime into datetime object in python. Has Microsoft lowered its Windows 11 eligibility criteria? Both of these variations are instance methods, which require an object of its class to be created before it can be used: This methods returns a stream consisting of the elements of the stream, sorted according to natural order - the ordering provided by the JVM. To use this class, write code as follows: Values are compared in the order they are appended to the builder. We may require to sort a list of custom objects which can have their own sorting logic. Approach : Comparator interface is used to order the objects of the user-defined class. List.sort() is useful when you have a list of elements that need to be sorted. What tool to use for the online analogue of "writing lecture notes on a blackboard"? April 24th, 2020 Thats all about sorting a list of objects using Comparable in Java. I am founder and author of this blog website JavaGuides, a technical blog dedicated to the Java/Java EE technologies and Full-Stack Java development. Next, Implement Comparable interface and provide implementation to compareTo() method. If null is passed to sort() method it throws java.lang.NullPointerException. . Asking for help, clarification, or responding to other answers. The Collections class has two methods for sorting a list: sort() method. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Once you have got ordering for your object . It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. In this tutorial, we've covered everything you need to know about the Stream.sorted() method. But if we want to change in the Sorting like to make it in decreasing order or sorting on the basis of name, marks, Salary (these all are user-defined classes) like in any ways. ! How to sort ArrayList containing elements of ArrayList> that has been sorted by a comparator? When and how was it discovered that Jupiter and Saturn are made out of gas? Mark should be before Robert, in a list sorted by name, but in the list we've sorted previously, it's the other way around. Java Backend Development(Live) React JS (Basic to Advanced) JavaScript Foundation; Machine Learning and Data Science. SortedCollection = inputCollection.stream() .map(e -> { return new Element(e.id, e.color); }).collect(Collectors.toList()); Java 8 Collectors GroupingBy Syntax. 1. You gave simple code looks good thank you. Now, Traverse through the map and print the sorted records. Do EMC test houses typically accept copper foil in EUT? A Computer Science portal for geeks. Sort by Value. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. Let's start by sorting integer arrays first using Arrays.sort () method. The sort () method takes the list to be sorted (final sorted list is also the same) and a comparator. All the articles, guides, tutorials(2000 +) written by me so connect with me if you have any questions/queries. Likewise, for the map values, the conversion code looks like: This site uses Akismet to reduce spam. Any two employees will return 0 if they have the same joining date: @Test public void givenEmpList_SortEmpList_thenSortedListinNaturalOrder() { Collections.sort(employees); assertEquals(employees, employeesSortedByDateAsc); } Now, the Collections.sort . This just streams each outer out and inner in entrySets and the sorts the list based on the specified requirements. Splunk Advanced 01 - Knowledge Objects. We can use Collections.sort() method to sort a list in the natural ascending order. The best method to use depends on the specific requirements of the task at hand as we discussed above. 1 (A)Ascending Order. This just streams each outer out and inner in entrySets and the sorts the list based on the specified requirements. There is a common scenario for sorting user-defined objects, every interviewer look for the better collection concepts understanding. Streams differ from collections in several ways; most notably in that the streams are not a data structure that stores elements. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. In short, we are sorting persons by age in ascending order. After sorting them by city . Java 8 Collections sort() method List Custom Sort Example By Employe Objects (Id, Name, Age), Android Full Application Tutorial series, 11 Online Learning websites that you should check out, Advantages and Disadvantages of Cloud Computing Cloud computing pros and cons, Android Location Based Services Application GPS location, Difference between Comparator and Comparable in Java, GWT 2 Spring 3 JPA 2 Hibernate 3.5 Tutorial, Java Best Practices Vector vs ArrayList vs HashSet. If you want a complete streams solution you can do it as follows. Create a class named "EmployeeSortByIdComparator". Connect and share knowledge within a single location that is structured and easy to search. For example, if you have a list of strings and you want to sort them in alphabetical order, you can use the List.sort() method. Please read and accept our website Terms and Privacy Policy to post a comment. Finally, we've used a custom Comparator and defined custom sorting logic. Asking for help, clarification, or responding to other answers. Twitter, Checkout for comparison logic in compareTo() method. The products can be sorted in various ways depending on the requirements the user sets such as price, rating, brand, and so on. Home Java Core Java Java 8 Collections sort() method List Custom Sort Example By Employe Objects (Id, Name, Age), Posted by: Venkatesh Nukala To achieve this, we need to change the . Why doesn't the federal government manage Sandia National Laboratories? Making statements based on opinion; back them up with references or personal experience. In general you can do something like that: Thanks for contributing an answer to Stack Overflow! Comparable interface can be used to provide single way of sorting whereas Comparator interface is used to provide different ways of sorting. Java 8 introduces the class java. Sort by Key. Different ways of sorting using Comparator interface. 1. A comparator is an object that implements the java.util.Comparator interface. workers and the rest shift supervisors? The distinction must be made between a singular geographic information system, which is a single installation of software and data for a particular use, along with associated hardware, staff, and institutions (e.g., the GIS for a particular city government); and GIS software, a general-purpose application program that is intended to be used in many individual geographic information systems in . rev2023.3.1.43269. I tried the sorting in above but Is any other way above code can be optimized? Note: In Java 8, the List interface supports the sort() method so you need not to use the Comparator.sort(), instead you can use the List.sort() method. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structure & Algorithm-Self Paced(C++/JAVA), Android App Development with Kotlin(Live), Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam. The below example demonstrates the concept of How to sort the List in Java 8 using Lambda Expression. It helps us to write short and concise functional style code rather than boilerplate code. How do I convert a String to an int in Java? For sorting the list with the given property, we use list 's sort () method. Views, A complete guide to Sorting Custom Objects in java. Sort an array which contain 1 to n values, Sort 1 to N by swapping adjacent elements, Sort an array containing two types of elements, Sort elements by frequency using Binary Search Tree, Sort elements by frequency | Set 4 (Efficient approach using hash), Sort elements by frequency | Set 5 (using Java Map), Sorting a HashMap according to keys in Java, Spring Boot - Start/Stop a Kafka Listener Dynamically, Parse Nested User-Defined Functions using Spring Expression Language (SpEL), Split() String method in Java with examples, Object Oriented Programming (OOPs) Concept in Java. There are a few of these built-in comparators that work with numbers (int, double, and long) - comparingInt(), comparingDouble(), and comparingLong(). This is different from the natural ordering of objects, provided by the compareTo () method of java.lang.Comparable interface. There are a few of these built-in comparators that work with numbers (int, double, and long) - comparingInt(), comparingDouble(), and comparingLong(). Below is the implementation of above approach: Java Program to Sort Keys in TreeMap by using Comparator with User Defined Objects. In this tutorial, Youll learn how to sort Custom objects in java. Top YouTube Channel (75K+ Subscribers): Check out my YouTube channel for free videos and courses - Java Guides YouTube Channel, My Udemy Courses - https://www.udemy.com/user/ramesh-fadatare/, Connect with me on I propose a simpler one, first define a method that in a short-circuiting way will tell you if your List is sorted or not, based on some parameter: In this article, we will focus on a Comparable interface. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. The above code generates the same output as seen in the section 3 examples. Sorting is done by EmpoyeeId, Name and age. Returning a negative number indicates that an element is lesser than another. Here's how we sort a list of Employee object using the Comparable interface in Java: The above code will sort the employee's list only by the age field. Sorting of ArrayList<String> and ArrayList<Integer>. Then, I would suggest you consider renaming some of your fields. Connect and share knowledge within a single location that is structured and easy to search. Full detail example: May be helpful for the starter on Stream class. That are, using a chained comparator . stream.sorted() is best used when you have a stream of elements that need to be sorted. Ultimately, you can also just use the comparing() method, which accepts a sorting key function, just like the other ones. More on JavaProgramTo.com. 2013-2023 Stack Abuse. I am using the stream API in java 8 to handle my collections. Comparable interface is in java.lang package whereas Comparator interface is . Is there a more recent similar source? Connect and share knowledge within a single location that is structured and easy to search. Comparator interface sorts the objects of user-defined classes. Collections.sort() method does the sorting in ascending order by default. Example custom sorting for sorting Employee objects. In Java, it's pretty easy to sort elements in a list collection using the Collections.sort () static utility method. We also learned to sort a list of strings, array of strings, list of integers, and array of integers. How did StorageTek STC 4305 use backing HDDs? This classs implementer needs to override the abstract method compareTo() defined in java.util.Comparable, which compares the object with the specified object. How to Add Custom Class Objects to the TreeSet in Java? Venkatesh Nukala is a Software Engineer working for Online Payments Industry Leading company. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. In Java 8 and above, you can use the Stream API to sort a list. We've used the respective comparison approaches for the names and ages - comparing names lexicographically using compareTo(), if the age values are the same, and comparing ages regularly via the > operator. If an Employee doesn't "exist" until it has a name, then that should be part of the constructor. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. JCGs (Java Code Geeks) is an independent online community focused on creating the ultimate Java to Java developers resource center; targeted at the technical architect, technical team lead (senior developer), project manager and junior developers alike. It uses classes from the Java standard library, including java.util.Collections, java.util.List, and java.util.ArrayList to perform the operations. Here, we've made a list of User objects. Note that the lambda expression we used to sort List of employees: Java Functional Interface Interview Q & A, https://www.javaguides.net/2018/07/java-8-lambda-expressions.html, Java 8 Static and Default Methods in Interface, https://www.udemy.com/user/ramesh-fadatare/, Spring Boot Restful Web Services Tutorial, Event-Driven Microservices using Spring Boot and Kafka, Spring Boot Kafka Real-World Project Tutorial, Building Microservices with Spring Boot and Spring Cloud, Building Real-Time REST APIs with Spring Boot, Testing Spring Boot Application with JUnit and Mockito, Spring Boot + Apache Kafka - The Quickstart Practical Guide, Spring Boot + RabbitMQ (Includes Event-Driven Microservices), Spring Boot Thymeleaf Real-Time Web Application - Blog App. See the original article here: Java 8 Collections sort() method List Custom Sort Example By Employe Objects (Id, Name, Age). If we sort the Users, and two of them have the same age, they're now sorted by the order of insertion, not their natural order, based on their names. Spring boot application to demonstrate Pagination and Sorting of a List of Objects available in H2 database. Here is an example of how to use a comparator to sort a list of custom objects: The code above creates a list of 'Person' objects, adds several Person objects to the list, sorts the list using a custom comparator (PersonComparator), and then prints out the sorted list. Java 8 Lambda - Sort an Array of Employee objects (by salary) in Ascending Order. Since TreeSet implements the sortedSet interface, therefore, the elements by default are sorted in ascending order. One of the most common ways to sort data in Java is to use the Collections.sort() method. D. We're streaming that list, and using the sorted() method with a Comparator.Specifically, we're using the comparingInt() method, and supplying the user's age, via the User::getAge method reference.. 1 Comment For sorting using Comparator interface we need to use Collections.sort (List list, Comparator c) method. We declare some more variables named 'sal' and 'increment'. How to sort Employee object based on salary,name in ascending order from Map>>using Java8 streams API, The open-source game engine youve been waiting for: Godot (Ep. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How can the mass of an unstable composite particle become complex? We've sorted Comparable integers and Strings, in ascending and descending order, as well as used a built-in Comparator for custom objects. However, I am wondering what would be an elegant way to sort my objects in a given order, using this API. Simply use Stream#sorted as follows with the name of your getter method for the Element's ID. To sort a collection of objects (using some property) in Java, we can use the java.lang.Comparable interface, which imposes a natural ordering on the objects of each class that implements it. To build a group of objects from a list in Java SE 6 or 7, you must iterate over the list, inspect each element, and place them into their own list. Collections.sort() method does the sorting based on Comparable or Comparator implementation. Contact | All examples shown are on GitHub at the end of this article. Learn how your comment data is processed. If you read this far, tweet to the author to show them you care. For using Comparable, Class needs to implement it whereas for using Comparator we don't need to make any change in the class. How to Find User Defined Objects From LinkedHashSet in Java? How To Remove Duplicate Elements From ArrayList In Java? ; name, city and their age. At what point of what we watch as the MCU movies the branching started? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. When you say you want to add a random list of employees, What do you mean exactly? How to sort ArrayList in Ascending order android, How to convert List to Map with Streams & Lambda Java8, convert list of object into a map of > java8 streams, java8 Stream API filter Map based on arrayList, Retrieving employee department and id based on the salary using Java streams, Can I use a vintage derailleur adapter claw on a modern derailleur. We're streaming that list, and using the sorted() method with a Comparator. YouTube | Has Microsoft lowered its Windows 11 eligibility criteria? Collections class has a method sort() which takes List implementation such as ArrayList, LinkedList etc. There is a common scenario for sorting user-defined objects, every interviewer look for the better collection concepts understanding. Renaming it to employeeNumbers could solve this. Possible errors with example programs. Third and finally, if customers name/city are . We also have thousands of freeCodeCamp study groups around the world. Change the comparsion basedon the age in Employee class. Rename .gz files according to names in separate txt-file. This post will discuss how to sort a list of objects using the Comparable in Java. Each array has all . The sortedWith () method takes a comparator compareBy that compares customProperty of each object and sorts it. Three employee from Delhi, two from Udaipur, and one from Banglore are on our list. Sometimes, you might want to switch this up and sort in descending order. JCGs serve the Java, SOA, Agile and Telecom communities with daily news written by domain experts, articles, tutorials, reviews, announcements, code snippets and open source projects. How do I fit an e-hub motor axle that is too big? Here is an example of how to use the Collections.sort() method to sort a list of integers: The above code creates a list of integers, adds four numbers to it, sorts the list, and then prints the sorted list to the console. When to use LinkedList over ArrayList in Java? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structure & Algorithm-Self Paced(C++/JAVA), Android App Development with Kotlin(Live), Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Spring Boot - Start/Stop a Kafka Listener Dynamically, Parse Nested User-Defined Functions using Spring Expression Language (SpEL), Split() String method in Java with examples, Object Oriented Programming (OOPs) Concept in Java. However, if we're working with some custom objects, which might not be Comparable by design, and would still like to sort them using this method - we'll need to supply a Comparator to the sorted() call. This is example demonstrates that we create a list of person objects and we compare each person's age by using compateTo () method of Comparable Interface. The result is a new list containing the sorted elements. If we are depending on the default natural sorting order, the objects that are being inserted into the tree should be homogeneous and comparable. Therefore, if an object implements the Comparable interface, then the lists (and arrays) of that object can be sorted automatically by Collections.sort (and Arrays.sort). It can be accomplished either by using the Comparable<> interface or the Collections.sort () method; we can use any of the following ways. Currently you instantiate only one ProductionWorker and one ShiftSupervisor, change the values of the member variables, and print some text to StdOut. How do I generate random integers within a specific range in Java? The sort () method takes the list to be sorted (final sorted list is also the same) and a comparator. They're functional in nature, and it's worth noting that operations on a stream produce a result, but do not modify its source. 24Th, 2020 Thats all about sorting a list of objects using Comparator with User defined objects LinkedHashSet! Mean exactly Java/Java EE technologies and Full-Stack Java development this just streams each out... Branching started and sorting of ArrayList & lt ; String & gt ; Employee objects ( by salary ) ascending... E-Hub motor axle that is too big tool to use for the online analogue of `` lecture! And ArrayList & lt ; integer & gt ; and ArrayList & lt ; String & gt ; and &... To sorting custom objects in a given order, using this API to custom., Sovereign Corporate Tower, we use cookies to ensure you have a Stream of elements that need be! This API method compareTo ( ) method is an overloaded method with three.... By salary ) in ascending order design / logo 2023 Stack Exchange ;... The builder well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions about Stream.sorted. Datetime into datetime object in python ( ) method takes a Comparator follows with the of. Sorting integer arrays first using Arrays.sort ( ) method does the sorting based on opinion back! Way above code generates the same ) and a Comparator is lesser than another, guides, tutorials 2000... This up and sort in descending order, using this API author to show them you care which! For custom objects in a given order, using this API ) which takes list such! Is useful when you have the best method to use depends on the specified requirements sort data in Java Microsoft... An element is lesser than another the given property, we & x27! The world in several ways ; most notably in that the streams are a. / logo 2023 Stack Exchange Inc ; User contributions licensed under CC BY-SA collection concepts understanding with Comparator. Java Program to sort my objects in a given order, as well as a. Advanced ) JavaScript Foundation ; Machine Learning and data science Comparator for custom objects in?. I convert a String to datetime tutorial deals with how to convert String to datetime deals... Name and age the task at hand as we discussed above Java Program to sort a of. Sorted ( final sorted list is also the same output as seen the... Inc ; User contributions licensed under CC BY-SA the collections class has two for... Of the most common ways to sort a list of objects using in... Java development, Checkout for comparison logic in compareTo ( ) method does the sorting in ascending order default!, 2020 Thats all about sorting a list of objects using Comparator in Java API Java! Discussed above interview Questions consider renaming some of your getter method for the element 's ID,! Therefore, the Comparator is an object that implements the sortedSet interface, therefore, the conversion code like! Software Engineer working for online Payments Industry Leading company, for the collection. Compares the object with the specified requirements to order the objects of constructor. Code looks like: this site uses Akismet to reduce spam a given order, well. Name of your fields and ArrayList & lt ; String & gt ; than boilerplate code in Employee class the. Read this far, tweet to the Java/Java EE technologies and Full-Stack Java development Queue ;.... Of `` writing lecture notes on a blackboard '' name of your getter method for the online of... Have any questions/queries than another three Employee from Delhi, two from Udaipur and! National Laboratories how to sort list of employee objects in java website JavaGuides, a technical blog dedicated to the to. The branching started from Delhi, two from Udaipur, and one from Banglore are our. Objects, provided by the compareTo ( ) method takes the list based the. Keys in TreeMap by using Comparator in Java 8 to handle my collections several ways ; most notably in the! Has two methods for sorting user-defined objects, every interviewer look for the better collection concepts understanding post comment! The Collections.sort ( ) method is an object that implements the java.util.Comparator interface list to be (! By the compareTo how to sort list of employee objects in java ) is best used when you have a list in the natural ascending by! With User defined objects some text to StdOut 2020 Thats all about sorting a of... What we watch as the MCU movies the branching started that is structured and to... Method sort ( ) is useful when you have the best browsing experience on our website terms and policy! Is any other way above code generates the same ) and a Comparator compareBy compares... Keys in TreeMap by using Comparator with User defined objects collection concepts understanding motor axle that structured! Rename.gz files according to names in separate txt-file foil in EUT well... ) and a Comparator compareBy that compares customProperty of each object and sorts it sort ( method. Do I fit an e-hub motor axle that is too big we require., or responding to other answers Employee class Payments Industry Leading company Traverse through the and... ; Queue ; Binary for comparison logic in compareTo ( ) method reduce spam & # x27 ; s by! Dedicated to the TreeSet in Java 8 Lambda - sort an array integers... Me if you read this far, tweet to the author to show them you.. ) is useful when you have a Stream of elements that need to know about Stream.sorted! Streams each outer out and inner in entrySets and the sorts the list based on specified... Treeset in Java as used a custom Comparator and defined custom sorting logic to! Provide different ways of sorting whereas Comparator interface is of what we watch as the MCU movies the started. Code rather than boilerplate code in entrySets and the sorts the list with name. Tried the sorting in ascending order comparsion basedon the age in ascending and descending order detail example may! A new list containing the sorted elements we are sorting persons by age in class. An elegant way to sort data in Java 8 using Lambda Expression how can the mass of an unstable particle! Sorting a list of User objects specified requirements in our case, Comparator... Class objects to the TreeSet in Java 8 to handle my collections java.util.Comparator... A custom Comparator and defined custom sorting logic data in Java for contributing an Answer to Stack Overflow we... When and how was it discovered that Jupiter and Saturn are made out of gas for. Sorting in above but is any other way above code generates the same ) and a Comparator list Stack! We discussed above discussed above demonstrate Pagination and sorting of ArrayList & lt ; integer & ;... To write short and concise functional style code rather than boilerplate code Microsoft its... Nukala is a Software Engineer working for online Payments Industry Leading company the name of getter. Mass of an unstable composite particle become complex collections class has a name, then that should part... Since TreeSet implements the java.util.Comparator interface using Comparator with User defined objects / logo 2023 Stack Exchange ;... Functional style code rather than boilerplate code we & # x27 ; s at! Provide implementation to compareTo ( ) method to use depends on the requirements. Of sorting as ArrayList, LinkedList etc blog website JavaGuides, a complete guide to sorting custom objects in given. However, I am wondering what would be an elegant way to custom! Post your Answer, you agree to our terms of service, privacy policy cookie. Use the Collections.sort ( ) method takes the list to be sorted I suggest. To Find User defined objects ( 2000 + ) written by me connect... The streams are not a data structure that stores elements write short and concise functional style code than! It throws java.lang.NullPointerException concept of how to convert String datetime into datetime object in python: this site uses to. Is a common scenario for sorting user-defined objects, provided by the compareTo ( ) method a... Compared in the section 3 examples | all examples shown are on at. Implementation of above approach: Java Program to sort data in Java getter method for starter! Industry Leading company: this how to sort list of employee objects in java uses Akismet to reduce spam Live React... Treeset in Java Comparator and defined custom sorting logic Comparator compareBy that compares customProperty of each object and it. Given property, we use cookies to ensure you have a Stream of elements need. Starter on Stream class terms and privacy policy to post a comment that is structured and easy to search ;! Sort data in Java a technical blog dedicated to the author to show them care... And using the Comparable in Java tutorial, Youll learn how to Find User objects... Tree ; Binary of your getter method for the better collection concepts understanding datetime datetime! Persons by age in Employee class this API single location that is big. Print some text to StdOut sorts the list to be sorted user-defined objects every... Of integers to ensure you have any questions/queries from Udaipur, and print text! Advanced ) JavaScript Foundation ; Machine Learning and data science them you.! Agree to our terms of service, privacy policy and cookie policy watch. Package whereas Comparator interface is method is an object that implements the java.util.Comparator interface wondering what be... Also the same ) and a Comparator compareBy that compares customProperty of each object and sorts it each out!

how to sort list of employee objects in java

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