Iterate or loop LinkedHashSet collection of String objects (java8/example)

• Given the LinkedHashSet collection of String Objects in java.
• Iterate through the LinkedHashSet collection using java 8 stream. We will demonstrate couple of methods to loop through LinkHashSet in java.
  1. Iterate through using LinkedHashSet’s Iterator.
  2. Loop through LinkedHashSet using Java 8 forEach (Lambda Streams).
• LinkedHashSet maintains the Insertion order of elements using LinkedList
• LinkedHashSet is UnSynchronized and not thread safe.
• Iterator of LinkedHashSet is fail-fast.
  • Iterator will throw ConcurrentModificationException, if LinkedHashSet modified at any time after the iterator is created, in any way except through the iterator’s own remove method.
• LinkedHashSet offers constant time performance for the basic operations like add, remove, contains and size.

1. LinkedHashSet collection class hierarchy:

2. Iterate LinkedHashSet of string objects – java 8 streams

package org.learn.collection.set.lhset;

import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;

public class DemoIterationLinkedHashSet {

	public static void main(String[] args) {
		Set<String> cmputerGenerations = new LinkedHashSet<>();
		cmputerGenerations.add("VacuumTubes");
		cmputerGenerations.add("Transistors");
		cmputerGenerations.add("IntegratedCircuits");
		cmputerGenerations.add("Microprocessors");
		cmputerGenerations.add("ArtificialIntelligence");

		System.out.println("Method 1 - Iterate LinkedHashSet: ");
		demoIterateLinkedHashSet(cmputerGenerations);

		System.out.println("\nMethod 2 - Iterate LinkedHashSet using java 8: ");
		demoIterateLinkedHashSetJava8(cmputerGenerations);
	}

	private static void demoIterateLinkedHashSet(Set<String> cmputerGenerations) {
		Iterator<String> iterator = cmputerGenerations.iterator();
		while (iterator.hasNext()) {
			System.out.println(iterator.next());
		}
	}

	private static void demoIterateLinkedHashSetJava8(Set<String> cmputerGenerations) {
		cmputerGenerations.forEach((key) -> {
			System.out.println(key);
		});
	}
}

3. Iterate LinkedHashSet of String objects – lambda streams

Method 1 - Iterate LinkedHashSet: 
VacuumTubes
Transistors
IntegratedCircuits
Microprocessors
ArtificialIntelligence

Method 2 - Iterate LinkedHashSet using java 8: 
VacuumTubes
Transistors
IntegratedCircuits
Microprocessors
ArtificialIntelligence