检查LinkedHashMap中是否存在特定密钥

 

import java.util.LinkedHashMap;

 
 /**来自 
  时 代 J a v a - N o w J a v a . c o m**/

public class Main {

 

  public static void main(String[] args) {

    LinkedHashMap lHashMap = new LinkedHashMap();

   

    lHashMap.put("1","One");

    lHashMap.put("2","Two");

    lHashMap.put("3","Three");

   

    boolean blnExists = lHashMap.containsKey("3");

    System.out.println("3 exists in LinkedHashMap ? : " + blnExists);

  }

}