In this example we shall show you how to obtain a LinkedHashMap Iterator, that is an iterator over the LinkedHashMap key value pairs. To obtain a LinkedHashMap Iterator one should perform the following steps:
- Create a new LinkedHashMap.
- Populate the linkedHashMap with elements, with
put(K key, V value)API method of LinkedHashMap. - Invoke
entrySet()API method of LinkedHashMap. It returns a Set with the key- value pairs that the linkedHashMap contains. - Invoke
iterator()API method of Set, to obtain the Set iterator. - Iterate through the linkedHashMap entries, with
hasNext()anfnext()API methods of Iterator,
as described in the code snippet below.
package com.javacodegeeks.snippets.core;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Set;
public class LinkedHashMapIterator {
public static void main(String[] args) {
// Create a LinkedHashMap and populate it with elements
LinkedHashMap linkedHashMap = new LinkedHashMap();
linkedHashMap.put("key_1","value_1");
linkedHashMap.put("key_2","value_2");
linkedHashMap.put("key_3","value_3");
// Get a set of all the entries (key - value pairs) contained in the LinkesHashMap
Set entrySet = linkedHashMap.entrySet();
// Obtain an Iterator for the entries Set
Iterator it = entrySet.iterator();
// Iterate through LinkedHashMap entries
System.out.println("LinkedHashMap entries : ");
while(it.hasNext())
System.out.println(it.next());
}
}
Output:
LinkedHashMap entries :
key_1=value_1
key_2=value_2
key_3=value_3
This was an example of how to obtain a LinkedHashMap Iterator in Java.
