JAVA EXAMPLE PROGRAMS

Program: How to iterate through LinkedHashSet?

Description:

Below example shows how to read all elements from LinkedHashSet object by using Iterator object.

Code:

package com.java2novice.linkedhashset;

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

public class MyLhsIterateEx {

	public static void main(String a[]){
		LinkedHashSet<String> lhs = new LinkedHashSet<String>();
		//add elements to HashSet
		lhs.add("first");
		lhs.add("second");
		lhs.add("third");
		Iterator<String> itr = lhs.iterator();
		while(itr.hasNext()){
			System.out.println(itr.next());
		}
	}
}

Output:

first
second
third

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When to use LinkedList or ArrayList?

Accessing elements are faster with ArrayList, because it is index based. But accessing is difficult with LinkedList. It is slow access. This is to access any element, you need to navigate through the elements one by one. But insertion and deletion is much faster with LinkedList, because if you know the node, just change the pointers before or after nodes. Insertion and deletion is slow with ArrayList, this is because, during these operations ArrayList need to adjust the indexes according to deletion or insetion if you are performing on middle indexes. Means, an ArrayList having 10 elements, if you are inserting at index 5, then you need to shift the indexes above 5 to one more.

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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.