$show=/label

Java Program To Get Union Of Two Arrays

SHARE:

A quick and programming guide to how to get the union of two unsorted arrays in java with example programs.

1. Overview

In this article, you'll learn how to get the union of two arrays in java.  A union set is all the values of two sets or from all collection.

We can do the union function in java using HashSet with arrays. Use the addAll() method to add all the values of each array into HashSet.

This is a simple solution. As well as this solution will work with both numbers and string values.

Java Program To Get Union Of Two Arrays


2. Union of two Integer arrays with numbers

Let us write the java program to print the union of two integer arrays.

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

public class UnionTwoArraysNumbers {

	public static void main(String[] args) {

		// Integer array 1
		Integer[] array1 = { 1, 2, 3, 4, 5, 6, 7, 8 };
		System.out.println("Array 1 : " + Arrays.toString(array1));

		// Integer array 2
		Integer[] array2 = { 2, 4, 6, 8, 10, 12, 14 };
		System.out.println("Array 2 : " + Arrays.toString(array2));

		// creating a new Set
		Set<Integer> unionOfArrays = new HashSet<>();

		// adding the first array to set
		unionOfArrays.addAll(Arrays.asList(array1));

		// adding the second array to set
		unionOfArrays.addAll(Arrays.asList(array2));

		// converting set to array.
		Integer[] unionArray = {};
		unionArray = unionOfArrays.toArray(unionArray);

		// printing the union of two arrays.
		System.out.println("Union of two arrays: " + Arrays.toString(unionArray));

	}

}

Output:

Array 1 : [1, 2, 3, 4, 5, 6, 7, 8]
Array 2 : [2, 4, 6, 8, 10, 12, 14]
Union of two arrays: [1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14]

3. Union of two String arrays

Let us write the java program to print the union of two String arrays.


public class UnionTwoArraysStrings {

	public static void main(String[] args) {

		// Integer array 1
		String[] array1 = { "A", "B", "C", "D" };
		System.out.println("String Array 1 : " + Arrays.toString(array1));

		// Integer array 2
		String[] array2 = { "C", "D", "E", "F" };
		System.out.println("String  Array 2 : " + Arrays.toString(array2));

		// creating a new Set
		Set<String> unionOfArrays = new HashSet<>();

		// adding the first array to set
		unionOfArrays.addAll(Arrays.asList(array1));

		// adding the second array to set
		unionOfArrays.addAll(Arrays.asList(array2));

		// converting set to array.
		String[] unionArray = {};
		unionArray = unionOfArrays.toArray(unionArray);

		// printing the union of two arrays.
		System.out.println("Union of two String arrays: " + Arrays.toString(unionArray));

	}

}

Output:

String Array 1 : [A, B, C, D]
String  Array 2 : [C, D, E, F]
Union of two String arrays: [A, B, C, D, E, F]

4. Conclusion

In this article, we've seen how to find the union of two arrays in java using HashSet.

As usual, all examples. are over Github.

How to compare two strings?

How to add integers to ArrayList?

HashSet

String API Methods

Integer API

COMMENTS

BLOGGER

About Us

Author: Venkatesh - I love to learn and share the technical stuff.
Name

accumulo,1,ActiveMQ,2,Adsense,1,API,37,ArrayList,16,Arrays,14,Bean Creation,3,Bean Scopes,1,BiConsumer,1,Blogger Tips,1,Books,1,C Programming,1,Collection,5,Collections,22,Collector,1,Command Line,1,Compile Errors,1,Configurations,7,Constants,1,Control Statements,8,Conversions,6,Core Java,81,Corona India,1,Create,2,CSS,1,Date,3,Date Time API,4,Dictionary,1,Difference,1,Download,1,Eclipse,2,Efficiently,1,Error,1,Errors,1,Exception,1,Exceptions,3,Fast,1,Files,9,Float,1,Font,1,Form,1,Freshers,1,Function,3,Functional Interface,2,Garbage Collector,1,Generics,4,Git,4,Grant,1,Grep,1,HashMap,1,HomeBrew,2,HTML,2,HttpClient,2,Immutable,1,Installation,1,Interview Questions,5,Iterate,2,Jackson API,3,Java,30,Java 10,1,Java 11,5,Java 12,5,Java 13,2,Java 14,2,Java 8,66,Java 8 Difference,2,Java 8 Stream Conversions,2,java 8 Stream Examples,3,Java 9,1,Java Conversions,11,Java Design Patterns,1,Java Files,1,Java Program,2,Java Programs,72,java.lang,5,java.util. function,1,jQuery,1,Kotlin,10,Kotlin Conversions,3,Kotlin Programs,6,Lambda,1,lang,29,Leap Year,1,live updates,1,Logging,1,Mac OS,2,Math,1,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,1,Sort,1,Sorting Techniques,8,Spring,2,Spring Boot,23,Spring Email,1,Spring MVC,1,Streams,21,String,58,String Programs,10,String Revese,1,Swing,1,System,1,Tags,1,Threads,10,Tomcat,1,Tomcat 8,1,Troubleshoot,16,Unix,2,Updates,3,util,5,While Loop,1,
ltr
item
JavaProgramTo.com: Java Program To Get Union Of Two Arrays
Java Program To Get Union Of Two Arrays
A quick and programming guide to how to get the union of two unsorted arrays in java with example programs.
https://1.bp.blogspot.com/-dMLcE7x1EEE/X3tEJ76RbnI/AAAAAAAAC9o/yI79IXN6y6klhx_igJcZ5Jl-W37kJD67wCLcBGAsYHQ/w640-h372/%2BJava%2BProgram%2BTo%2BGet%2BUnion%2BOf%2BTwo%2BArrays.png
https://1.bp.blogspot.com/-dMLcE7x1EEE/X3tEJ76RbnI/AAAAAAAAC9o/yI79IXN6y6klhx_igJcZ5Jl-W37kJD67wCLcBGAsYHQ/s72-w640-c-h372/%2BJava%2BProgram%2BTo%2BGet%2BUnion%2BOf%2BTwo%2BArrays.png
JavaProgramTo.com
https://www.javaprogramto.com/2020/10/java-program-to-get-union-of-two-arrays.html
https://www.javaprogramto.com/
https://www.javaprogramto.com/
https://www.javaprogramto.com/2020/10/java-program-to-get-union-of-two-arrays.html
true
3124782013468838591
UTF-8
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS PREMIUM CONTENT IS LOCKED STEP 1: Share to a social network STEP 2: Click the link on your social network Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy Table of Content