java.util.HashMap.remove() 方法

package com.codingdict;

import java.util.*;

public class HashMapDemo {
   public static void main(String args[]) {

      // create hash map
      HashMap newmap = new HashMap();      

      // populate hash map
      newmap.put(1, "tutorials");
      newmap.put(2, "point");
      newmap.put(3, "is best");

      System.out.println("Values before remove: "+ newmap);

      // remove value for key 2
      newmap.remove(2);

      System.out.println("Values after remove: "+ newmap);
   }    
}