使用Stream对ArrayList进行操作。 结合IntStream来获取索引。 通过mapToObj方法将索引和元素组合。 代码示例 以下代码示例展示了如何使用Java的ArrayList和Stream获取元素的索引。 importjava.util.ArrayList;importjava.util.List;importjava.util.stream.IntStream;p
importjava.util.ArrayList;publicclassStreamArrayListExample{publicstaticvoidmain(String[]args){// 创建ArrayList对象ArrayList<String>list=newArrayList<>();// 添加数据list.add("Apple");list.add("Banana");list.add("Orange");// 使用Stream的forEach方法遍历ArrayList并输出list.stream().forEach(element->...
...如何在Java中将ArrayList转换为数组 (How to Convert ArrayList to Array in Java) 使用手动方式转换 (Convert Using Manual...在此方法中,我们将首先创建一个大小等于ArrayList大小的数组。 之后,使用get()方法获取 ArrayList的每个元素,然后将其复制到array中。 ...Array str=list.toArray(str); //pr...
Using Java Streams Using add() method To convert an array to an ArrayList, create an empty ArrayList and add() method of the ArrayList class accepts an element and adds it to the current ArrayList. Open Compiler import java.util.ArrayList; import java.util.Iterator; public class ArrayToArr...
获取要转换的 Stream。 使用collect() 和 Collectors.toCollection() 方法将流收集为 ArrayList。 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() method importjava.util.*; ...
Here’s an example of initializing an ArrayList using the Stream API: ArrayList<String>names=Stream.of("John","Alice").collect(Collectors.toCollection(ArrayList::new));System.out.println(names);#Output:#[John,Alice] Java Copy In this example,Stream.of("John", "Alice")creates a new stream...
在Java 8中,可以使用 String[] arrayFromList = fromlist.stream().toArray(String[]::new); Run Code Online (Sandbox Code Playgroud) Kha*_*ela 6 通用解决方案可将任何秘密转换List<Type>为String []: public static <T> String[] listToArray(List<T> list) { String [] array = new String...
After filling all array elements, if there is more space left in array then'null'is populated in all those spare positions. Seel Also:Java Stream toArray() 2. ArrayList toArray() Examples 2.1. UsingtoArray() Java program to convert anArrayListtoObject[]and iterate through array content. ...
Object[]toArray() Returns an array containing all of the elements in this list in proper sequence (from first to last element). <T> T[]toArray(T[] a) Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of...
importjava.util.ArrayList;Copy Listrepresents an ordered sequence of values where some value may occur more than one time. ArrayListis one of theListimplementations built atop an array, which is able to dynamically grow and shrink as you add/remove elements. Elements could be easily accessed by...