大公司最喜欢问的Java集合类面试题 - 跳出温水的青蛙 - 博客频道 - CSDN.NET



大公司最喜欢问的Java集合类面试题 - 跳出温水的青蛙 - 博客频道 - CSDN.NET

  • 如果涉及到堆栈，队列等操作，应该考虑用List，对于需要快速插入，删除元素，应该使用LinkedList，如果需要快速随机访问元素，应该使用ArrayList。
  • 如果程序在单线程环境中，或者访问仅仅在一个线程中进行，考虑非同步的类，其效率较高，如果多个线程可能同时操作一个类，应该使用同步的类。
  • 要特别注意对哈希表的操作，作为key的对象要正确复写equals和hashCode方法。

  • 尽量返回接口而非实际的类型，如返回List而非ArrayList，这样如果以后需要将ArrayList换成LinkedList时，客户端代码不用改变。这就是针对抽象编程。

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