将字符串集合转换为 Java 中的字符串数组

原文:https://www . geesforgeks . org/convert-set-of-string-to-array-of-string-in-Java/

给定一组字符串，任务是将该组字符串转换为 Java 中的字符串数组。

示例:

Input: Set<String>: ["ForGeeks", "A Computer Portal", "Geeks"]
Output: String[]: ["ForGeeks", "A Computer Portal", "Geeks"]

Input: Set<String>: ["G", "e", "k", "s"]
Output: String[]: ["G", "e", "k", "s"]

• Method 1: Naive Method.

  1. 获取字符串集。
  2. 创建一个空的字符串数组，其大小与字符串数组的大小相同。
  3. 使用高级 for 循环，将字符串集的每个元素复制到字符串数组中。
  4. 返回或打印字符串数组。

  下面是上述方法的实现:

  ```java // Java program to convert // Set of Strings to Array of Strings

  import java.util.Arrays; import java.util.Set; import java.util.HashSet;

  class GFG {

  // Function to convert Set to String[]     public static String[] convert(Set setOfString)     {

  // Create String[] of size of setOfString         String[] arrayOfString = new String[setOfString.size()];

  // Copy elements from set to string array         // using advanced for loop         int index = 0;         for (String str : setOfString)             arrayOfString[index++] = str;

  // return the formed String[]         return arrayOfString;     }

  public static void main(String[] args)     {

  // Get the Set of String         Set             setOfString = new HashSet<>(                 Arrays.asList("Geeks",                               "ForGeeks",                               "A Computer Portal"));

  // Print the setOfString         System.out.println("Set of String: "                            + setOfString);

  // Convert Set to String array         String[] arrayOfString = convert(setOfString);

  // Print the arrayOfString         System.out.println("Array of String: "                            + Arrays.toString(arrayOfString));     } } ```

  Output:

  ```java Set of String: [ForGeeks, A Computer Portal, Geeks] Array of String: [ForGeeks, A Computer Portal, Geeks]

  ```

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