The following example shows different ways of iterating over a HashSet
- Iterate over a HashSet using Java 8 forEach and lambda expression.
- Iterate over a HashSet using iterator().
- Iterate over a HashSet using iterator() and Java 8 forEachRemaining() method.
- Iterate over a HashSet using a simple for-each loop.
package com.javaguides.collections.hashsetexamples; import java.util.HashSet; import java.util.Iterator; import java.util.Set; public class IterateOverHashSetExample { public static void main(String[] args) { Set < String > programmingLanguages = new HashSet < > (); programmingLanguages.add("C"); programmingLanguages.add("C++"); programmingLanguages.add("Java"); programmingLanguages.add("Python"); programmingLanguages.add("PHP"); programmingLanguages.add("Ruby"); System.out.println("=== Iterate over a HashSet using Java 8 forEach and lambda ==="); programmingLanguages.forEach(programmingLanguage - > { System.out.println(programmingLanguage); }); System.out.println("=== Iterate over a HashSet using iterator() ==="); Iterator < String > programmingLanguageIterator = programmingLanguages.iterator(); while (programmingLanguageIterator.hasNext()) { String programmingLanguage = programmingLanguageIterator.next(); System.out.println(programmingLanguage); } System.out.println("=== Iterate over a HashSet using iterator() and Java 8 forEachRemaining() method ==="); programmingLanguageIterator = programmingLanguages.iterator(); programmingLanguageIterator.forEachRemaining(programmingLanguage - > { System.out.println(programmingLanguage); }); System.out.println("=== Iterate over a HashSet using simple for-each loop ==="); for (String programmingLanguage: programmingLanguages) { System.out.println(programmingLanguage); } } }
Output
=== Iterate over a HashSet using Java 8 forEach and lambda ===
Java
C++
C
PHP
Ruby
Python
=== Iterate over a HashSet using iterator() ===
Java
C++
C
PHP
Ruby
Python
=== Iterate over a HashSet using iterator() and Java 8 forEachRemaining() method ===
Java
C++
C
PHP
Ruby
Python
=== Iterate over a HashSet using simple for-each loop ===
Java
C++
C
PHP
Ruby
Python
Related Java HashSet Source Code Examples
- Creating a HashSet and Adding New Elements to It
- Java 8 forEach() Set Example
- Java Convert Array to Set
- Iterating over a HashSet using Iterator
- Iterate over HashSet in Java
- Remove Element from HashSet in Java
- Create HashSet in Java
Collection Framework
HashSet
Java
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