Given a Stream, the task is to convert this Stream into ArrayList in Java 8.
Examples:
Input: Stream: [1, 2, 3, 4, 5] Output: ArrayList: [1, 2, 3, 4, 5] Input: Stream: ['G', 'e', 'e', 'k', 's'] Output: ArrayList: ['G', 'e', 'e', 'k', 's'
1. Using Collectors.toList() method:
Below is the implementation of the above approach:
Program:
// Java program to convert Stream to ArrayList // using Collectors.toList() method import java.util.*; import java.util.stream.*; public class GFG { // Function to get ArrayList from Stream public static ArrayList getArrayListFromStream(Stream stream) { // Convert the Stream to List List list = stream.collect(Collectors.toList()); // Create an ArrayList of the List ArrayList arrayList = new ArrayList(list); // Return the ArrayList return arrayList; } // Driver code public static void main(String args[]) { Stream stream = Stream.of(1, 2, 3, 4, 5); // Convert Stream to ArrayList in Java ArrayList arrayList = getArrayListFromStream(stream); // Print the arraylist System.out.println("ArrayList: " + arrayList); } }
Output:
ArrayList: [1, 2, 3, 4, 5]
2.Using Collectors.toCollection() method:
Approach:
Below is the implementation of the above approach:
// Java program to convert Stream to ArrayList // using Collectors.toList() method import java.util.*; import java.util.stream.*; public class GFG { // Function to get ArrayList from Stream public static ArrayList getArrayListFromStream(Stream stream) { // Convert the Stream to ArrayList ArrayList arrayList = stream .collect(Collectors .toCollection(ArrayList::new)); // Return the ArrayList return arrayList; } // Driver code public static void main(String args[]) { Stream stream = Stream.of(1, 2, 3, 4, 5); // Convert Stream to ArrayList in Java ArrayList arrayList = getArrayListFromStream(stream); // Print the arraylist System.out.println("ArrayList: " + arrayList); } }