如何在Java 8中从Stream获取ArrayList()

给定一个Stream, 任务是将该流转换为Java 8中的ArrayList。
例子:

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']

使用Collectors.toList()方法:
  1. 获取要转换的流。
  2. 使用collect()和Collectors.toList()方法将流收集为List。
  3. 将此列表转换为ArrayList
  4. 返回/打印ArrayList
下面是上述方法的实现:
程序:
//Java program to convert Stream to ArrayList //using Collectors.toList() methodimport java.util.*; import java.util.stream.*; public class GFG {//Function to get ArrayList from Stream public static < T> ArrayList< T> getArrayListFromStream(Stream< T> stream) {//Convert the Stream to List List< T> list = stream.collect(Collectors.toList()); //Create an ArrayList of the List ArrayList< T> arrayList = new ArrayList< T> (list); //Return the ArrayList return arrayList; }//Driver code public static void main(String args[]) {Stream< Integer> stream = Stream.of( 1 , 2 , 3 , 4 , 5 ); //Convert Stream to ArrayList in Java ArrayList< Integer> arrayList = getArrayListFromStream(stream); //Print the arraylist System.out.println( "ArrayList: " + arrayList); } }

输出如下:
ArrayList: [1, 2, 3, 4, 5]

使用Collectors.toCollection()方法:
方法:
  1. 获取要转换的流。
  2. 使用collect()和Collectors.toCollection()方法将流收集为ArrayList。
  3. 返回/打印ArrayList
下面是上述方法的实现:
程序:
//Java program to convert Stream to ArrayList //using Collectors.toList() methodimport java.util.*; import java.util.stream.*; public class GFG {//Function to get ArrayList from Stream public static < T> ArrayList< T> getArrayListFromStream(Stream< T> stream) {//Convert the Stream to ArrayList ArrayList< T> arrayList = stream .collect(Collectors .toCollection(ArrayList:: new )); //Return the ArrayList return arrayList; }//Driver code public static void main(String args[]) {Stream< Integer> stream = Stream.of( 1 , 2 , 3 , 4 , 5 ); //Convert Stream to ArrayList in Java ArrayList< Integer> arrayList = getArrayListFromStream(stream); //Print the arraylist System.out.println( "ArrayList: " + arrayList); } }

【如何在Java 8中从Stream获取ArrayList()】输出如下:
ArrayList: [1, 2, 3, 4, 5]

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