HashMap

 HashMap hs=newHashMap();       

 hs.put("name","张三");       

 hs.put("sex","男");       

 hs.put("age","30");       

 hs.put("home","河北");    

 //测试是否包含关键字"name" 

 System.out.println(hs.containsKey("name"));//返回true 

System.out.println(hs.get("name"));//返回 张三 

System.out.println(hs.entrySet());//返回 [home=河北, sex=男, age=30, name=张三] System.out.println(hs.hashCode());//返回7960688 

System.out.println(hs.keySet()); //返回 [home, sex, age,name] 

摘自：http://blog.sina.com.cn/s/blog_6d2890600100l7id.html