blocks|key|1830256|text|我想说的是，每次java面试都需要两件事：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1830257|要获得基本的语言知识，请参阅您最喜欢的书籍或Sun教程。|ordered-list-item|offset|length|1830258|关于最佳实践，请阅读约书亚·布洛赫的有效Java|1830259|除此之外，阅读任何似乎适合于工作描述的内容，但我要说这两者都是基本的。|1830260|我想这些包与每个java作业都相关：|1830261|java.lang+(核心类)|unordered-list-item|1830262|java.io+(文件和资源I/O)|1830263|java.util+(集合框架)|1830264|java.text+(文本解析/操作)|1830265|entityMap|0|LINK|mutability|MUTABLE|url|http://download.oracle.com/javase/tutorial/1.|1|http://java.sun.com/docs/books/effective/^0|0|M|5|0|0|A|E|1|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|16|8|@]|9|@$E|17|F|18|1|19]]|A|$]]|$1|G|3|H|5|D|7|1A|8|@]|9|@$E|1B|F|1C|1|1D]]|A|$]]|$1|I|3|J|5|6|7|1E|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1F|8|@]|9|@]|A|$]]|$1|M|3|N|5|O|7|1G|8|@]|9|@]|A|$]]|$1|P|3|Q|5|O|7|1H|8|@]|9|@]|A|$]]|$1|R|3|S|5|O|7|1I|8|@]|9|@]|A|$]]|$1|T|3|U|5|O|7|1J|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]]|W|$X|$5|Y|Z|10|A|$11|12]]|13|$5|Y|Z|10|A|$11|14]]]]

I'd say there are two things you need for every java interview:

<ol>
<li>For Basic knowledge of the Language, consult your favorite book or the <a href="http://download.oracle.com/javase/tutorial/1." rel="nofollow">Sun Java Tutorial</a></li>
<li>For Best Practices read <a href="http://java.sun.com/docs/books/effective/" rel="nofollow">Effective Java by Joshua Bloch</a></li>
</ol>

Apart from that, read whatever seems appropriate to the job description, but I'd say these two are elementary.

I guess these packages are relevant for every java job:

<ul>
<li>java.lang (Core classes)</li>
<li>java.io (File and Resource I/O)</li>
<li>java.util (Collections Framework)</li>
<li>java.text (Text parsing / manipulation)</li>
</ul>

blocks|key|2185543|text|java.io+-流和作者之间的差异。缓冲流。|type|unordered-list-item|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2185544|java.util+-集合框架。Set和List.HashMap是什么，TreeMap。关于混凝土收藏效率的几个问题|2185545|java.lang+-包装器类型，自动装箱|2185546|java.util.concurrent+-同步辅助，原子原语，执行器，并发集合。|2185547|多线程-对象监视器，synchronized关键字，方法-静态和非静态.|2185548|unstyled|entityMap^0|0|7|0|0|9|G|3|K|4|P|7|10|7|0|0|9|0|0|K|0|A|C|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]|$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@]|E|$]]|$1|L|3|M|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|N|3|-4|5|O|7|1D|8|@]|D|@]|E|$]]]|P|$]]

<ul>
<li><code>java.io</code> - difference between streams and writers. Buffered streams.</li>
<li><code>java.util</code> - the collection framework. <code>Set</code> and <code>List</code>. What's <code>HashMap</code>, <code>TreeMap</code>. Some questions on efficiency of concrete collections</li>
<li><code>java.lang</code> - wrapper types, autoboxing</li>
<li><code>java.util.concurrent</code> - synchronization aids, atomic primitives, executors, concurrent collections.</li>
<li>multithreading - object monitors, <code>synchronized</code> keyword, methods - static and non-static.</li>
</ul>

blocks|key|1830267|text|IMHO更重要的是要坚定地理解概念，而不是对API的具体知识，尤其是特定类的内部工作。例如；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1830268|知道HashMap不是同步的很重要|unordered-list-item|offset|length|style|CODE|1830269|了解这可能如何影响多线程应用程序是很重要的。|1830270|知道这个问题的解决方案是很重要的。|1830271|entityMap^0|0|2|7|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@$E|Q|F|R|G|H]]|9|@]|A|$]]|$1|I|3|J|5|D|7|S|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|T|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|N|$]]

IMHO its more important to have a firm understanding of the concepts rather than specific knowledge of the API and especially the internal workings of specific classes. For example;

<ul>
<li>knowing that <code>HashMap</code> is not synchronized is important</li>
<li>knowing how this might affect a multithreaded app is important</li>
<li>knowing what kind of solutions exist for this problem is important</li>
</ul>

blocks|key|2185557|text|我不会太担心特定的API细节，比如ConcurrentHashMap的各个方法，除非您正在面试一份被宣传为需要大量高级线程逻辑的工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2185558|对基本Java的深入理解更为重要，像有效Java这样的书籍可以在那里有所帮助。至少同样重要的是了解更高层次的概念，如面向对象和设计模式。|2185559|了解什么是多态性、封装和继承，以及何时和如何使用它们是至关重要的。知道如何在多态性和委托之间做出决定(是--a与已经-a是一个不错的开端，但Liskov代换原理是一个更好的指南)，以及为什么您可能希望更倾向于组合而不是继承。为此，我强烈推荐Robert的“敏捷软件开发”。或者查看此链接以获得初始概述。|offset|length|2185560|了解一些核心模式，如单例、工厂、外观和观察者。阅读GoF书籍和/或Head+First+Design+Patterns。|2185561|我还建议学习有关重构、单元测试、依赖注入和模拟的知识。|2185562|所有这些主题不仅对你的面试有帮助，还会让你成为一个更好的开发人员。|2185563|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Liskov_substitution_principle|1|http://butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod^0|0|0|1Y|A|0|3W|3|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@$F|10|G|11|1|12]|$F|13|G|14|1|15]]|A|$]]|$1|H|3|I|5|6|7|16|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|17|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|18|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]|V|$5|Q|R|S|A|$T|W]]]]

I wouldn't worry too much about specific API details like individual methods of ConcurrentHashMap, unless you're interviewing for a job that is advertised as needing a lot of advanced threading logic.

A thorough understanding of the basic Java API's is more important, and books like Effective Java can help there. At least as important though is to know higher level concepts like Object Orientation and Design Patterns.

Understanding what Polymorphism, Encapsulation and Inheritance are, and when and how to use them, is vital. Know how to decide between Polymorphism and Delegation (is-a versus has-a is a decent start, but the <a href="http://en.wikipedia.org/wiki/Liskov_substitution_principle" rel="nofollow">Liskov Substitution Principle</a> is a better guide), and why you may want to favor composition over inheritance. I highly recommend "Agile Software Development" by Robert Martin for this subject. Or check out <a href="http://butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod" rel="nofollow">this link</a> for an initial overview.

Know some of the core patterns like singleton, factory, facade and observer. Read the GoF book and/or Head First Design Patterns.

I also recommend learning about refactoring, unit testing, dependency injection and mocking.

All these subject won't just help you during interviews, they will make you a better developer.

blocks|key|631994|text|我们通常需要有关新开发人员的以下知识：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|631995|低层次(方案拟订)问题：|631996|http://www.interview-questions-java.com/|offset|length|631997|反图案：|631998|http://en.wikipedia.org/wiki/Anti-pattern|631999|设计：|632000|模式|632001|entityMap|0|LINK|mutability|MUTABLE|url|1|2|http://en.wikipedia.org/wiki/Design_Patterns^0|0|0|0|14|0|0|0|0|15|1|0|0|0|2|2|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@$F|12|G|13|1|14]]|A|$]]|$1|H|3|I|5|6|7|15|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|16|8|@]|9|@$F|17|G|18|1|19]]|A|$]]|$1|L|3|M|5|6|7|1A|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1B|8|@]|9|@$F|1C|G|1D|1|1E]]|A|$]]|$1|P|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|E]]|W|$5|S|T|U|A|$V|K]]|X|$5|S|T|U|A|$V|Y]]]]

We usually require the following knowledge on new developers:

Low level (programming) questions:

<a href="http://www.interview-questions-java.com/" rel="nofollow">http://www.interview-questions-java.com/</a>

Antipatterns:

<a href="http://en.wikipedia.org/wiki/Anti-pattern" rel="nofollow">http://en.wikipedia.org/wiki/Anti-pattern</a>

Design:

<a href="http://en.wikipedia.org/wiki/Design_Patterns" rel="nofollow">http://en.wikipedia.org/wiki/Design_Patterns</a>

blocks|key|632009|text|在我去过的一些访谈中，也包括了java.io包，有时还会有一些荒谬的问题，比如一些很少使用的方法会声明抛出什么样的异常，或者是否存在一些奇怪的构造函数重载。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|632010|并发性对于更高级别的职位总是很重要，但我认为很好地了解这些概念(并理解ofc)会比特定的API知识赢得更多的分数。|632011|在访谈中提到的其他一些API是反射(可能是关于它可以实现什么的两个问题)，也包括java.lang.ref.Reference及其子类。|632012|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

On some of the interviews I have been to, there is also the java.io package covered, sometimes with absurd questions on what kind of exceptions would some rarely used method declare to throw, or whether some strange looking constructor overload exists. 
Concurrency is always important for higher-level positions, but I think that knowing the concepts well (and understanding them ofc) would win you more points than specific API knowledge. 
Some other APIs that get mentioned at interviews are Reflection (maybe couple questions on what can be achieved with it) and also java.lang.ref.Reference and its subclasses.

blocks|key|1830331|text|我问了一些基本的问题(‘列表和集合之间有什么区别？’，‘界面是什么？’等等)，然后我离开了简历。如果hibernate在那里5次，我希望候选人能够定义ORM。你会感到惊讶的是，他们经常做不到。我也对候选人如何处理软件感兴趣--他们对软件有热情吗？而且非常重要的是，候选人相信TDD。当然，如果这是一个真正的高级职位，问题会更高级(例如“什么是ThreadLocal，什么时候使用它”)，但是对于大多数候选人来说，这是不必要的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1830332|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I ask some basic questions ('whats the difference between a list and a set?', 'whats an interface?', etc) and then I go off the resume. If hibernate is on there 5 times, I expect the candidate to be able to define ORM. You would be surprised how often it happens that they can't. I am also interested in how the candidate approaches software -- do they have a passion for it? And it is very important that the candidate believes in TDD. Naturally, if its a really senior position, the questions will be more advanced (e.g. 'whats ThreadLocal and when do you use it'), but for most candidates this is not necessary.

blocks|key|2185589|text|完全同意卢克的观点。我们不能坚持一些API为核心Java面试做准备。我认为必须完全理解Java中的OOPS概念。对oops有很好的了解，让面试官知道这个人可以轻松、快速地学习新API。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2185590|应涵盖的专题如下：|2185591|OOPS概念|2185592|升压&+DownCasting|2185593|穿线|2185594|收集框架。|2185595|这里有个很好的帖子可以开始。核心Java访谈问答|offset|length|2185596|entityMap|0|LINK|mutability|MUTABLE|url|http://www.java-redefined.com/2013/08/core-java-interview-questions-answers.html^0|0|0|0|0|0|0|E|A|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|10|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|12|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|13|8|@]|9|@$N|14|O|15|1|16]]|A|$]]|$1|P|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W]]]]

Completely agree with Luke here. We can not stick to some API's to prepare for Core Java interviews. I think a complete understanding of the OOPS concept in Java is must. Have good knowledge of oops shows the interviewer that the person can learn new API's easily and quick.

Topics that should be covered are as follows:

OOPS Concept

Upcasting &amp; DownCasting

Threading

Collection framework.

Here is a good post to get started. <a href="http://www.java-redefined.com/2013/08/core-java-interview-questions-answers.html" rel="nofollow">Core Java Interview Q &amp; A</a>

This is little different from what already been asked for <a href="https://stackoverflow.com/questions/706190/java-books-for-preparing-for-interviews">here</a> 

I would like to know what topics/APIs are most important for Java interviews. for example - 

<ul>
<li>Concurrency, </li>
<li>Collections 
.....and like that. </li>
</ul>

The reason is because implementations like <code>ConcurrentHashMap</code> (read <a href="http://www.ibm.com/developerworks/java/library/j-jtp08223/" rel="nofollow noreferrer">here</a>) have so much details in them, that one would like to discuss about them as it covers many important aspects

Important topics/APIs list for Java interview

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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这与的要求并没有什么不同。我想知道哪些主题/API对Java面试最重要。例如-并发收藏品.....and就像那样。原因是因为像ConcurrentHashMap (read )这样的实现包含了太多的细节，所以人们希望讨论它们，因为它涵盖了许多重要的方面。

问Java面试的重要主题/API列表
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