将列表转换为数组

在Java中，我们可以使用将List转换为数组，参考以下步骤：

• 循环(for / while / do-while)
• List.toArray()
• Stream(在Java8中引入)

文件：ListToArrayExample.java –

package com.yiibai.tutorial;  import java.util.ArrayList; import java.util.List;  /**  * @author yiibai  *  */ public class ListToArrayExample {     public static void main(String[] args) {         //List to be converted into array         List<String> list=new ArrayList<>();         list.add("A");         list.add("B");         list.add("C");         list.add("D");         list.add("E");          /*Method - 1 (Using for loop)*/         String[] array1=new String[list.size()];         for (int i = 0; i < list.size(); i++) {             array1[i]=list.get(i);         }         System.out.println("Method -1 Output:");         for (String string : array1) {             System.out.println(string);         }          /*Method - 2 (List.toArray())*/         String[] array2=list.toArray(new String[list.size()]);         System.out.println(" Method -2 Output:");         for (String string : array2) {             System.out.println(string);         }          /*Method - 3 (Using stream)*/         String[] array3=list.stream().toArray(String[]::new);         System.out.println(" Method -3 Output:");         for (String string : array3) {             System.out.println(string);         }     } } 

执行上面示例代码，得到以下结果 –

Method -1 Output: A B C D E  Method -2 Output: A B C D E  Method -3 Output: A B C D E