import javautilHashMap;
 import javautilMap;
 public class Test {
   public static void main(String[] args) {
     Map map = new HashMap();//声明一个Map
     mapput("s", "哈哈");//向map中放值：map是key-value的形式存放的
     String str = mapget("s")toString();//map获取key为"s"的value
     Systemoutprintln(str);
   }
 }

 import java.util.HashMap;
 import java.util.Map;
 public class Test {
   public static void main(String[] args) {
     Map map = new HashMap();
     String key = "java";
     String key = "java";
     map.put(key, "java的值");
     map.put(key, "java的值");
     System.out.println(map.get(key));
     System.out.println(map.get(key));
   }
 }