Java Collection How to - Keep the insertion order with LinkedHashMap

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Question

We would like to know how to keep the insertion order with LinkedHashMap.

Answer

  //w  w w. j a va 2s .  com

       
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedHashMap;

public class Main {
  public static void main(String[] args) {
    LinkedHashMap<String,String> lHashMap = new LinkedHashMap<String,String>();

    lHashMap.put("1", "One");
    lHashMap.put("2", "Two");
    lHashMap.put("3", "Three");

    Collection c = lHashMap.values();
    Iterator itr = c.iterator();

    while (itr.hasNext()){
      System.out.println(itr.next());
    }
  }
}

The code above generates the following result.

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