Map的遍历

//方法一: 用entrySet()
   Iterator it = emails.entrySet().iterator();
   while(it.hasNext()){
    Map.Entry m=(Map.Entry)it.next();
    logger.info("email-" + m.getKey() + ":" + m.getValue());
   }
 
   // 方法二：jdk1.5支持，用entrySet()和For-Each循环()
   for (Map.Entry<String, String> m : emails.entrySet()) {
  
    logger.info("email-" + m.getKey() + ":" + m.getValue());
   }
 
   // 方法三：用keySet()
   Iterator it = emails.keySet().iterator();
   while (it.hasNext()){
    String key;
    key=(String)it.next();
    logger.info("email-" + key + ":" + emails.get(key));
   }

// 方法五：jdk1.5支持，用keySEt()和For-Each循环

for(Object m: emails.keySet()){
    logger.info("email-" + m+ ":" + emails.get(m));
   }

文章出处：http://www.diybl.com/course/3_program/java/javajs/2008525/117745.html