java131-hashtable

import java.util.Hashtable;
  
 //hashtable
 public class test70 {
     public  static void main(String[] args){
         Hashtable ht=new Hashtable();
         ht.put("k0","歌谣");
         ht.put("k1","小白");
         ht.put("k2","小红");
         //ht.put("k3",null);//hashtable不能用null存取值
         System.out.println(  ht);
     }
 }

运行结果