How to convert an Array to a Set in Java

How to convert an Array to a Set in Java

To convert an array to a set in Java, you can use the java.util.Arrays class or the java.util.stream.Collectors class, depending on your preference and Java version. Here are two common approaches:

Method 1: Using java.util.Arrays (for Java 7 and later):

import java.util.Arrays; import java.util.HashSet; import java.util.Set; public class ArrayToSet { public static void main(String[] args) { // Create an array of integers Integer[] array = {1, 2, 3, 2, 4, 5, 4}; // Convert the array to a Set using Arrays.asList() and HashSet constructor Set<Integer> set = new HashSet<>(Arrays.asList(array)); // Printing the set System.out.println("Set: " + set); } }

In this example:

  • We create an array of integers (array) with some duplicate elements.

  • We use Arrays.asList(array) to convert the array into a List.

  • Then, we create a HashSet from the List. The HashSet automatically eliminates duplicate elements.

Method 2: Using java.util.stream.Collectors (for Java 8 and later):

import java.util.Arrays; import java.util.Set; import java.util.stream.Collectors; public class ArrayToSetJava8 { public static void main(String[] args) { // Create an array of integers Integer[] array = {1, 2, 3, 2, 4, 5, 4}; // Convert the array to a Set using Java 8 streams and Collectors.toSet() Set<Integer> set = Arrays.stream(array) .collect(Collectors.toSet()); // Printing the set System.out.println("Set: " + set); } }

In this example:

  • We create an array of integers (array) with some duplicate elements.

  • We use Java 8 streams to convert the array into a Set by calling Arrays.stream(array) and then using Collectors.toSet().

Both methods will give you a Set containing the elements from the array with duplicates eliminated. Choose the method that fits your Java version and coding style.

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