Java map集合顺序如何同步添加顺序

package com.lxk.collectionTest; 
 
import com.google.common.collect.Maps; 
 
import java.util.Map; 
 
/** 
 * 测试Map是否有序的区别 
 * <p> 
 * Created by lxk on 2017/5/24 
 */ 
public class OrderedMapTest { 
  public static void main(String[] args) { 
    Map<String, Integer> hashMap = Maps.newHashMap(); 
    Map<String, Integer> treeMap = Maps.newTreeMap(); 
    Map<String, Integer> linkedHashMap = Maps.newLinkedHashMap(); 
    System.out.println("--------------test hashMap"); 
    testMap(hashMap); 
    System.out.println("--------------test treeMap"); 
    testMap(treeMap); 
    System.out.println("--------------test linkedHashMap"); 
    testMap(linkedHashMap); 
  } 
 
  private static void testMap(Map<String, Integer> map) { 
    map.put("asd", 1); 
    map.put("2das", 2); 
    map.put("3das", 3); 
    map.put("4das", 4); 
    for (Map.Entry<String, Integer> entry : map.entrySet()) { 
      System.out.println(entry.getKey() + ":" + entry.getValue()); 
    } 
  } 
 
}