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                # 如何將`HashSet`轉換為`TreeSet` > 原文: [https://beginnersbook.com/2014/08/how-to-convert-a-hashset-to-a-treeset/](https://beginnersbook.com/2014/08/how-to-convert-a-hashset-to-a-treeset/) #### 描述 將`HashSet`轉換為`TreeSet`的程序 #### 程序 這是`HashSet`到`TreeSet`轉換的完整代碼。我們有一個`HashSet<String>`,我們通過將`HashSet`的所有元素復制到`TreeSet`來創建字符串`TreeSet`。 ```java import java.util.HashSet; import java.util.TreeSet; import java.util.Set; class ConvertHashSettoTreeSet{ public static void main(String[] args) { // Create a HashSet HashSet<String> hset = new HashSet<String>(); //add elements to HashSet hset.add("Element1"); hset.add("Element2"); hset.add("Element3"); hset.add("Element4"); // Displaying HashSet elements System.out.println("HashSet contains: "+ hset); // Creating a TreeSet of HashSet elements Set<String> tset = new TreeSet<String>(hset); // Displaying TreeSet elements System.out.println("TreeSet contains: "); for(String temp : tset){ System.out.println(temp); } } } ``` **輸出:** ```java HashSet contains: [Element1, Element2, Element3, Element4] TreeSet contains: Element1 Element2 Element3 Element4 ```
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