如何迭代Set/HashSet？

在本节中，我们将看到迭代HashSet的示例。这里将使用迭代Set：

• For-Each循环
• Iterator 接口
• Stream(在Java8中引入)

文件：IterateSetExample.java –

package com.yiibai.tutorial;  import java.util.Arrays; import java.util.HashSet; import java.util.Iterator; import java.util.Set;  /**  * @author yiibai  *  */ public class IterateSetExample {    public static void main(String[] args) {       Set<String> set = new HashSet<>(Arrays             .asList(new String[] { "Java" "Jsp" "Servlet" "Jdbc" "Collection" }));        /* Method 1 - Iterating using for loop */       System.out.println("Method 1 - Iterating using for-each loop");       for (String string : set) {          System.out.println(string);       }        /* Method 2 - Iterating using Iterator */       System.out.println(" Method 2 - Iterating using Iterator");       Iterator<String> iterator = set.iterator();       while (iterator.hasNext()) {          System.out.println(iterator.next());       }        /* Method 3 - Iterating using Stream */       System.out.println(" Method 3 - Iterating using Stream");       set.stream().forEach(a -> System.out.println(a));     } } 

执行上面示例代码，得到以下结果 –

Method 1 - Iterating using for-each loop Java Jsp Jdbc Servlet Collection  Method 2 - Iterating using Iterator Java Jsp Jdbc Servlet Collection  Method 3 - Iterating using Stream Java Jsp Jdbc Servlet Collection