Iterate Through Elements of LinkedHashSet in Java

The LinkedHashSet is an ordered version of HashSet that maintains a doubly-linked List across all elements. When the iteration order is needed to be maintained this class is used.

Example:

Input: 
["Geeks", "for", "Geeks"]


Output:
Geeks
for
Geeks
    
Input: 
[9, 4, 6, 2, 8]


Output:
9
4
6
2
8

Different Ways to Iterate LinkedHashSet Elements:

1. Using the for-each loop
2. Using iterators
3. Using JDK 1.8 streams

Method 1:  Using the for-each loop

Geeks
for
geeks

Method 2: Using iterators

Iterate through the elements of  LinkedHashSet using the iterator method.  We will use the hasNext() method and the next() method along with the while loop to iterate through LinkedHashSet elements.

Type Parameters:

• E – the type of elements maintained by this set.

Syntax:

public Iterator<E> iterator()

Return: This method returns the element of LinkedHashSet in the same order as the input.

Geek
For
Geeks
Courses
Interview Prep
Doubt Classes

Method 3: Using JDK 1.8 streams

Iterate through the elements of LinkedHashSet using the forEach method. We will iterate through the entire content using Stream. The stream represents a sequence of objects from a source, which supports aggregate operations.

Syntax:

set.stream().forEach()

Return: Returns a sequential stream considering collection as its source.

9
7
11
43
2

Time complexity: O(N), where N is no. of elements of LinkedHashSet.