你遇到的Java面试题？

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1

你都遇到过哪些的Java面试题啊？求分享。
我先说一下我遇到过的：

  1. What are the differences between an abstract class and an interface?
  2. What is polymorphism?
  3. Why string is immutable?
  4. How does HashMap works?
  5. How do you create a thread?
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参考

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谢谢。