The following example shows different ways of iterating over a TreeSet.
- 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.treesetexamples; import java.util.Iterator; import java.util.SortedSet; import java.util.TreeSet; public class IterateOverTreeSetExample { public static void main(String[] args) { // Creating a TreeSet SortedSet < String > fruits = new TreeSet < > (); // Adding new elements to a TreeSet fruits.add("Banana"); fruits.add("Apple"); fruits.add("Pineapple"); fruits.add("Orange"); System.out.println("=== Iterate over a HashSet using Java 8 forEach and lambda ==="); fruits.forEach(fruit - > { System.out.println(fruit); }); System.out.println("=== Iterate over a HashSet using iterator() ==="); Iterator < String > fruitIterator = fruits.iterator(); while (fruitIterator.hasNext()) { String fruit = fruitIterator.next(); System.out.println(fruit); } System.out.println("=== Iterate over a HashSet using iterator() and Java 8 forEachRemaining() method ==="); fruitIterator = fruits.iterator(); fruitIterator.forEachRemaining(fruit - > { System.out.println(fruit); }); System.out.println("=== Iterate over a HashSet using simple for-each loop ==="); for (String fruit: fruits) { System.out.println(fruit); } } }
Output
=== Iterate over a HashSet using Java 8 forEach and lambda ===
Apple
Banana
Orange
Pineapple
=== Iterate over a HashSet using iterator() ===
Apple
Banana
Orange
Pineapple
=== Iterate over a HashSet using iterator() and Java 8 forEachRemaining() method ===
Apple
Banana
Orange
Pineapple
=== Iterate over a HashSet using simple for-each loop ===
Apple
Banana
Orange
Pineapple
Reference
Related Collections Examples
- Java LinkedHashMap Example
- Java HashSet Example
- Java LinkedList Example
- Java ArrayList Example
- Java Comparator Interface Example
- Java Comparable Interface Example
- Java IdentityHashMap Example
- Java WeakHashMap Example
- Java EnumMap Example
- Java CopyOnWriteArraySet Example
- Java EnumSet Class Example
- Guide to Java 8 forEach Method
- Different Ways to Iterate over a List in Java [Snippet]
- Different Ways to Iterate over a Set in Java [Snippet]
- Different Ways to Iterate over a Map in Java [Snippet]
- Iterate over TreeSet in Java Example
- Iterate over LinkedHashSet in Java Example
- Remove First and Last Elements of LinkedList in Java
- Iterate over LinkedList using an Iterator in Java
- Search an Element in an ArrayList in Java
- Iterate over ArrayList using Iterator in Java
- Remove Element from HashSet in Java
- Iterating over a HashSet using Iterator
- How To Remove Duplicate Elements From ArrayList In Java?
- Different Ways to Iterate over List, Set, and Map in Java
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