Check if 2 list are equal java
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The equals() method of List interface compares the specified object with this collection for equality. It returns a Boolean value true if both the lists have same elements and are of the same size. Show Syntaxpublic boolean equals(Object o) The parameter 'o' represents the object to be compared for equality with this list. Specified Byequals in interface Collection OverridesThis method overrides equals in class Object ReturnsThe equals method returns a Boolean value 'true' if the specified object is equal to this list else it returns false. Example 1import java.util.LinkedList;
import java.util.List;
public class JavaListEqualsExample1 {
public static void main(String[] args) {
List Output: Both the lists are equal. List : [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] List1 : [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] Example 2import java.util.LinkedList;
import java.util.List;
public class JavaListEqualsExample2 {
public static void main(String[] args) {
List Output: Both the lists are unequal. List : [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] List1 : [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] Next TopicJava List accumulo,1,ActiveMQ,2,Adsense,1,API,37,ArrayList,18,Arrays,24,Bean Creation,3,Bean Scopes,1,BiConsumer,1,Blogger Tips,1,Books,1,C Programming,1,Collection,8,Collections,37,Collector,1,Command Line,1,Comparator,1,Compile Errors,1,Configurations,7,Constants,1,Control Statements,8,Conversions,6,Core Java,149,Corona India,1,Create,2,CSS,1,Date,3,Date Time API,38,Dictionary,1,Difference,2,Download,1,Eclipse,3,Efficiently,1,Error,1,Errors,1,Exceptions,8,Fast,1,Files,17,Float,1,Font,1,Form,1,Freshers,1,Function,3,Functional Interface,2,Garbage Collector,1,Generics,4,Git,9,Grant,1,Grep,1,HashMap,2,HomeBrew,2,HTML,2,HttpClient,2,Immutable,1,Installation,1,Interview Questions,6,Iterate,2,Jackson API,3,Java,32,Java 10,1,Java 11,6,Java 12,5,Java 13,2,Java 14,2,Java 8,128,Java 8 Difference,2,Java 8 Stream Conversions,4,java 8 Stream Examples,12,Java 9,1,Java Conversions,14,Java Design Patterns,1,Java Files,1,Java Program,3,Java Programs,114,Java Spark,1,java.lang,4,java.util. function,1,JavaScript,1,jQuery,1,Kotlin,11,Kotlin Conversions,6,Kotlin Programs,10,Lambda,2,lang,29,Leap Year,1,live updates,1,LocalDate,1,Logging,1,Mac OS,3,Math,1,Matrix,6,Maven,1,Method References,1,Mockito,1,MongoDB,3,New Features,1,Operations,1,Optional,6,Oracle,5,Oracle 18C,1,Partition,1,Patterns,1,Programs,1,Property,1,Python,2,Quarkus,1,Read,1,Real Time,1,Recursion,2,Remove,2,Rest API,1,Schedules,1,Serialization,1,Servlet,2,Sort,1,Sorting Techniques,8,Spring,2,Spring Boot,23,Spring Email,1,Spring MVC,1,Streams,31,String,61,String Programs,28,String Revese,1,StringBuilder,1,Swing,1,System,1,Tags,1,Threads,11,Tomcat,1,Tomcat 8,1,Troubleshoot,26,Unix,3,Updates,3,util,5,While Loop,1, Learn to compare two arraylists in Java with simple examples. We will first test if two arraylists are equal or not. If both lists are not equal, we will find the difference between lists. The difference in list is equals to another third list which contains either additional elements or missing elements. Also learn to find common elements between two arraylists. 1. Compare two arraylists for equalityJava program to test if two given lists are equal. To test equality –
List.equals() method return true if both elements are of same size and both contains same set of elements in exactly same order. public class ArrayListExample { public static void main(String[] args) { ArrayListProgram output. false true2. Compare two arraylists – find additional elementsIf two arraylists are not equal and we want to find what are additional elements in first list in comparison to second list then we can use this method. It uses removeAll() method which removes all elements of second list from first list. It leaves only additonal elements in first list. public class ArrayListExample { public static void main(String[] args) { ArrayListProgram output. 3. Compare two arraylists – find missing elementsTo get the missing elements in first list, which are present in second list, we can reverse the above example. Here we can remove all elements of first list from second list using removeAll() method. public class ArrayListExample { public static void main(String[] args) { ArrayListProgram output. [e]4. Compare two arraylists – find common elementsTo find common elements in two arraylists, use List.retainAll() method. This method retains only the elements in this list that are contained in the specified arraylist passed as method argument. public class ArrayListExample { public static void main(String[] args) { ArrayListProgram output. [a, b, c, d]Above example will work good in Java 8 as well. Happy Learning !! Read More: A Guide to Java ArrayList Let us know if you liked the post. That’s the only way we can improve.
This method is used to compare two lists. It compares the lists as, both lists should have the same size, and all corresponding pairs of elements in the two lists are equal. Syntax: boolean equals(Object o)Parameters: This function has a single parameter which is object to be compared for equality. Returns: This method returns True if lists are equal. Below programs show the implementation of this method. Program 1:
Output: [10, 15, 20] [100, 200, 300] Not equal Program 2: Below is the code to show implementation of list.addAll() using Linkedlist.
Output: [10, 15, 20] [10, 15, 20] Equal Reference: Practice Tags : |
