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How to keep the insertion order with Java LinkedHashMap?
To keep the insertion order with LinkedHashMap, use Iterator. Let us first create a HashMap and add elements to it −
LinkedHashMap<String, String>lHashMap = new LinkedHashMap<String, String>();
lHashMap.put("1", "A");
lHashMap.put("2", "B");
lHashMap.put("3", "C");
lHashMap.put("4", "D");
lHashMap.put("5", "E");
lHashMap.put("6", "F");
lHashMap.put("7", "G");
lHashMap.put("8", "H");
lHashMap.put("9", "I");Now, get the values with the values() method. Iterate through the elements and display them −
Collection collection = lHashMap.values();
Iterator i = collection.iterator();
while (i.hasNext()) {
System.out.println(i.next());
}Example
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedHashMap;
public class Demo {
public static void main(String[] args) {
LinkedHashMap<String, String>lHashMap = new LinkedHashMap<String, String>();
lHashMap.put("1", "A");
lHashMap.put("2", "B");
lHashMap.put("3", "C");
lHashMap.put("4", "D");
lHashMap.put("5", "E");
lHashMap.put("6", "F");
lHashMap.put("7", "G");
lHashMap.put("8", "H");
lHashMap.put("9", "I");
Collection collection = lHashMap.values();
Iterator i = collection.iterator();
while (i.hasNext()) {
System.out.println(i.next());
}
}
}Output
A B C D E F G H I
Updated on: 30-Jul-2019
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