Convert Java Set to List
In this article, we will go through 4 different ways to convert java Set to Java List object.
Java Set Object
mySet is the Set object which contains 4 Strings.
Set mySet = new HashSet(Arrays.asList("Red", "Yellow", "Green", "Blue")); Using Constructor
List myList = new ArrayList(mySet); Using addAll
Using the addAll method we can add all the items in the set to list-objects.
List myList2 = new ArrayList();
myList2.addAll(mySet); Using for each
By using for each to loop though all the items in the Set we can add them one by one to the List.
List myList3 = new ArrayList();
mySet.forEach(a->myList3.add(a)); Using Java Stream
List myList4 = mySet.stream().collect(Collectors.toList()); Full source code
package myjava.work.general;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
public class JavaListFromSet {
public static void main(String[] args) {
Set<String> mySet = new HashSet<String>(Arrays.asList("Red", "Yellow", "Green", "Blue"));
// Using Constructor
List<String> myList = new ArrayList<String>(mySet);
myList.forEach(a -> System.out.println(a));
// Using addAll
List<String> myList2 = new ArrayList<String>();
myList2.addAll(mySet);
myList2.forEach(a -> System.out.println(a));
// Using For Each
List<String> myList3 = new ArrayList<String>();
mySet.forEach(a -> myList3.add(a));
myList3.forEach(a -> System.out.println(a));
// Using Stream
List<String> myList4 = mySet.stream().collect(Collectors.toList());
myList4.forEach(a -> System.out.println(a));
}
}
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