1回答

• 

  安静的成长

  2018-09-03 14:29:55

  //两种方法

  /**

  *1，利用KeySet方法遍历

  */

  public void test testKeySet(){

      Set<String>KeySet = students.keySet();
  

      for(String stuId:KeySet){

          Student stu = students.get(stuId);

          if(stu!=null){

              System.out.println("学生："+stu.name);

          }

      }
  

  }

  /**

  *2，利用EntrySet方法遍历

  */

  public void testEntrySet(){

      Set<Entry<String,Student>>entrySet = students.entrySet();
  

      for(Set<Entry<String,Student>>entry:entrySet){
  

          System.out.println("取得键："+entry.getKey());
  

          System.out.println("对应的值为："+entry.getValue().name);
  

  }

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