Java面试题目(English),先占个位置,有空了慢慢翻译

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面试 Java JSP 多线程 Swing

答案参考链接：
http://www.allapplabs.com/interview_questions/java_interview_questions_7.htm

第一页
Question:    What is the difference between an Interface and an Abstract class?(接口和对象的区别)
Question: What is the purpose of garbage collection in Java, and when is it used?(什么是Java的垃圾回收，什么时候将会用到（执行）它)
Question: Describe synchronization in respect to multithreading.（描述一下多线程中的同步）
Question: Explain different way of using thread? （解释使用(实现)thred的不同方法）
Question: What are pass by reference and pass by value?(什么是引用传递和值传递)
Question: What is HashMap and Map?（什么是HashMap和Map）
Question: Difference between HashMap and HashTable?（什么是HashMap和HashTable的区别）
Question: Difference between Vector and ArrayList?（Vector和Arraylist的区别）
Question: Difference between Swing and Awt?（Swing和Awt的区别(很少问这个问题吧？)）
Question: What is the difference between a constructor and a method?(构造函数和方法的区别)
Question: What is an Iterator?（什么是Iterator）
Question: State the significance of public, private, protected, default modifiers both singly and in combination and state the effect of package relationships on declared items qualified by these modifiers.(逐一陈述一下public，private，protected，default(friendly)的意义(太难翻译了，后面的省略了))
Question: What is an abstract class?(什么是抽象类)
Question: What is static in java?（什么是static）
Question:       What is final? (什么是final)

第二页
Question:    What if the main method is declared as private?
Question: What if the static modifier is removed from the signature of the main method?
Question: What if I write static public void instead of public static void?
Question: What if I do not provide the String array as the argument to the method?
Question: What is the first argument of the String array in main method?
Question: If I do not provide any arguments on the command line, then the String array of Main method will be empty or null?
Question: How can one prove that the array is not null but empty using one line of code?
Question: What environment variables do I need to set on my machine in order to be able to run Java programs?
Question: Can an application have multiple classes having main method?
Question: Can I have multiple main methods in the same class?
Question: Do I need to import java.lang package any time? Why ?
Question: Can I import same package/class twice? Will the JVM load the package twice at runtime?
Question: What are Checked and UnChecked Exception?
Question: What is Overriding?
Question: What are different types of inner classes?

第三页
Question:     Are the imports checked for validity at compile time? e.g. will the code containing an import such as java.lang.ABCD compile?
Question: Does importing a package imports the subpackages as well? e.g. Does importing com.MyTest.* also import com.MyTest.UnitTests.*?
Question: What is the difference between declaring a variable and defining a variable?
Question: What is the default value of an object reference declared as an instance variable?
Question: Can a top level class be private or protected?
Question: What type of parameter passing does Java support?
Question: Primitive data types are passed by reference or pass by value?
Question: Objects are passed by value or by reference?
Question: What is serialization?
Question: How do I serialize an object to a file?
Question: Which methods of Serializable interface should I implement?
Question: How can I customize the seralization process? i.e. how can one have a control over the serialization process?
Question: What is the common usage of serialization?
Question: What is Externalizable interface?
Question: When you serialize an object, what happens to the object references included in the object?
Question: What one should take care of while serializing the object?
Question: What happens to the static fields of a class during serialization?

第四页
Question:     Does Java provide any construct to find out the size of an object?
Question: Give a simplest way to find out the time a method takes for execution without using any profiling tool?
Question: What are wrapper classes?
Question: Why do we need wrapper classes?
Question: What are checked exceptions?
Question: What are runtime exceptions?
Question: What is the difference between error and an exception??
Question: How to create custom exceptions?
Question: If I want an object of my class to be thrown as an exception object, what should I do?
Question: If my class already extends from some other class what should I do if I want an instance of my class to be thrown as an exception object?
Question: How does an exception permeate through the code?
Question: What are the different ways to handle exceptions?
Question: What is the basic difference between the 2 approaches to exception handling...1> try catch block and 2> specifying the candidate exceptions in the throws clause?
When should you use which approach?
Question: Is it necessary that each try block must be followed by a catch block?
Question: If I write return at the end of the try block, will the finally block still execute?
Question: If I write System.exit (0); at the end of the try block, will the finally block still execute?

第五页
Question:     How are Observer and Observable used?
Question: What is synchronization and why is it important?
Question: How does Java handle integer overflows and underflows?
Question: Does garbage collection guarantee that a program will not run out of
memory?
Question: What is the difference between preemptive scheduling and time slicing?
Question: When a thread is created and started, what is its initial state?
Question: What is the purpose of finalization?
Question: What is the Locale class?
Question: What is the difference between a while statement and a do statement?
Question: What is the difference between static and non-static variables?
Question: How are this() and super() used with constructors?
Question: What are synchronized methods and synchronized statements?
Question: What is daemon thread and which method is used to create the daemon thread?
Question: Can applets communicate with each other?
Question: What are the steps in the JDBC connection?
Question: How does a try statement determine which catch clause should be used to handle an exception?

第六页
Question:     Can an unreachable object become reachable again?
Question: What method must be implemented by all threads?
Question: What are synchronized methods and synchronized statements?
Question: What is Externalizable?
Question: What modifiers are allowed for methods in an Interface?
Question: What are some alternatives to inheritance?
Question: What does it mean that a method or field is "static"? ?
Question: What is the difference between preemptive scheduling and time slicing?
Question: What is the catch or declare rule for method declarations?

第七页
Question:     Is Empty .java file a valid source file?
Question: Can a .java file contain more than one java classes?
Question: Is String a primitive data type in Java?
Question: Is main a keyword in Java?
Question: Is next a keyword in Java?
Question: Is delete a keyword in Java?
Question: Is exit a keyword in Java?
Question: What happens if you dont initialize an instance variable of any of the primitive types in Java?
Question: What will be the initial value of an object reference which is defined as an instance variable?
Question: What are the different scopes for Java variables?
Question: What is the default value of the local variables?
Question: How many objects are created in the following piece of code?
MyClass c1, c2, c3;
c1 = new MyClass ();
c3 = new MyClass ();
Question: Can a public class MyClass be defined in a source file named YourClass.java?
Question: Can main method be declared final?
Question: What will be the output of the following statement?
System.out.println ("1" + 3);
Question: What will be the default values of all the elements of an array defined as an instance variable?

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大家帮忙做做实验：like的时候‘%’的位置 ... | Java变量作用域内存

2010-05-12 00:07
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17 楼 yewen0125 2010-05-14

very, good

16 楼 litdong 2010-05-13

要英文的? 这里有 http://litdong.iteye.com/admin/blogs/663634

15 楼 laodaoke 2010-05-13

我觉得看Core Java挺不错的，很多概念之前不清楚/一知半解的，熟读后明白了许多

14 楼抢街饭 2010-05-13

英语真是越来越菜了

13 楼 shuiguozheng 2010-05-13

操！英文！

12 楼 tk230 2010-05-13

fsadfwqsdafsdaf

11 楼 wxy5001 2010-05-13

楼上的整理得不错,参考一下.呵呵.

10 楼 xredman 2010-05-13

我也来一份，感觉可以作为面试前的训练
 
<a href="http://blog.csdn.net/cheayu/archive/2007/05/22/1621472.aspx"> JAVA面试题最全集</a> 
 一、Java基础知识 1.Java有那些基本数据类型，String是不是基本数据类型，他们有何区别。 2.字符串的操作： 写一个方法，实现字符串的反转，如：输入abc，输出cba 写一个方法，实现字符串的替换，如：输入bbbwlirbbb，输出bbbhhtccc。 3.数据类型之间的转换 如何将数值型字符转换为数字（Integer，Double） 如何将数字转换为字符 如何取小数点前两位，并四舍五入。 4.日期和时间 如何取得年月日，小时分秒 如何取得从1970年到现在的毫秒数 如何获取某个日期是当月的最后一天 如何格式化日期 5.数组和集合 6.文件和目录（I/O）操作 如何列出某个目录下的所有文件 如何列出某个目录下的所有子目录 判断一个文件或目录是否存在 如何读写文件 7.Java多态的实现（继承、重载、覆盖） 8.编码转换，怎样实现将GB2312编码的字符串转换为ISO-8859-1编码的字符串。 9.Java中访问数据库的步骤，Statement和PreparedStatement之间的区别。 10.找出下列代码可能存在的错误，并说明原因： 
二、JSP&Servlet技术 1.描述JSP和Servlet的区别、共同点、各自应用的范围 2.在Web开发中需要处理HTML标记时，应做什么样的处理，要筛选那些字符（< > & “”） 3.在JSP中如何读取客户端的请求，如何访问CGI变量，如何确定某个Jsp文件的真实路径。 4.描述Cookie和Session的作用，区别和各自的应用范围，Session工作原理。 5.列出Jsp中包含外部文件的方式，两者有何区别。 6.说明Jsp中errorPage的作用，应用范围。 7.介绍在Jsp中如何使用JavaBeans。 8.简单介绍JSP的标记库 9.Jsp和Servlet中的请求转发分别如何实现。
三、J2EE相关知识 1.介绍J2EE、J2SE、J2SE的区别。 2.J2EE是一种技术还是一种平台，他提供了那些技术。 3.什么是Application Server，它有什么功能和优点。 4.简单介绍连接池的优点和原理。 5.Web.xml的作用
四、其他 1.Web安全性的考虑（表单验证、浏览器Basic方式的验证，应用程序的安全性，SSL，代码考虑） 2.简单介绍您所了解的MVC。 3.简单介绍所了解的XML。 4.文档和编码规范 5.Java中的分页、效率考虑。 6.简单介绍您所了解的structs。

9 楼 kingapex 2010-05-13

不懂英格力诗

8 楼 southking 2010-05-13

留个脚印先

7 楼 UlsterBoy 2010-05-13

很久以前流行，现在不怎么用了。
大公司基本采用在线测试....

6 楼 Checkmate 2010-05-12

第一页
问题：接口和抽象类有什么区别
问题：gc在Java中的作用是什么，什么时候用到
问题：根据多线程来谈谈同步
问题：讲讲有什么不同的方法来用多线程
问题：什么通过值传递，什么通过引用传递。
问题：什么是HashMap，什么是Map
问题：HashMap和HashTable的区别
问题：Vector和ArrayList的区别
问题：Swing和AWT的区别
问题：构造函数和方法的区别
问题：什么是Iterator
问题：陈述public, private, protected, default标识符的作用(不理解这几个东西怎么in combination.)并描述一下使用以上标识符在包之间的影响。
问题：什么是抽象类
问题：在java中什么是static
问题：什么是final

第二页
问题：如果将main函数声明为private会怎样
问题：如果将main函数的static标识符去掉会怎样
问题：用static public void待地public static void会怎样
问题：如果不用string数组作参数会怎么样
问题：如果我在命令行中什么都不输入，那么main函数的string数组是空的还是null
问题：如何用一行代码来证明数组不是null而是空的
问题：为了运行Java程序，我需要在我的电脑上设置什么环境变量
问题：一个程序可以在拥有main函数的同时有多个类吗
问题：我可以在一个类里有多个main函数吗
问题：我需要在任何时候都导入java.lang包吗，为什么
问题：我可以导入相同的包/类两次吗？JVM会在运行时载入包两次？
问题：什么是可控和不可控的异常?
问题：什么是重写？
问题：内部类有什么不同的类型？

第三页
问题：import的包会在编译的时候检查合法性吗？例如，包含了引入java.lang.ABCD的代码会被编译？
问题：导入包的时候也会将包的子目录导入？例如导入com.MyTest.*也会导入 com.MyTest.UnitTests.*?
问题：声明和实例化一个变量的区别是什么
问题：声明为实例变量的对象的引用的默认值是什么
问题：顶级的类可以是private或protected吗
问题：Java支持什么类型的参数传递？
问题：原始类型变量是引用传递还是值传递？
问题：对象是值传递还是引用传递
问题：什么是序列化
问题：我如何将一个对象序列化到一个文件
问题：应该实现Serializable接口中的哪个方法
问题：我如何自定义序列化的过程？例如，如果控制序列化的进程。
问题：序列化的通用方法是什么
问题：什么是Externalizable接口
问题：当你序列化一个对象时，对象的引用和对象会发生什么事情？
问题：当序列化对象的时候，需要注意什么？
问题：在序列化的时候，一个类的static域会发生什么事情？

第四页
问题：Java提供过任何结构来查找一个对象的大小吗？
问题：不用任何分析工具，用最简单的方法找到方法的运行时间
问题：什么是包装类
问题：我们为什么需要包装类？
问题：什么是可控异常？
问题：什么是运行时异常？
问题：error和exception的区别是什么？
问题：如何自定义异常？
问题：如果我想让我的类将一个对象当成异常抛出，我该怎么做？
问题：如果我的类已经继承了其他的类，如果我想让我的类的一个实例作为异常对象抛出，我该怎么做？
问题：异常是如何渗入代码的？（想不好怎么翻译了呢）
问题：有什么不同的方法处理异常？
问题：两种异常处理方法有什么基本区别？1>try catch块 2>在throws语句中指定异常
问题：每一个try代码块有必要跟着一个catch代码块吗？
问题：如果我在try的结尾写了一个return，finally代码块还会被执行吗？
问题：如果我在try的结尾写了System.exit (0); finally代码块还会执行吗？

第五页
问题：Observer和Observable如何使用？
问题：什么是同步，为什么它重要？
问题：Java如何处理整型溢出和下溢？
问题：gc可以保证程序不会内存溢出吗?
问题：preemptive scheduling和time slicing有什么区别？（还真没听过，老老实实的放这吧）
问题：当一个线程被创建并运行的时候，它的初始状态是什么？
问题：finalization的目的是什么？
问题：什么是Locale类？
问题：while语句和do语句的区别是什么？
问题：静态变量和非静态变量的区别是什么？
问题：在构造函数中用是如何用this()和super()的
问题：什么是同步方法和同步语句？
问题：什么是daemon线程，那个方法用于创建daemon线程？
问题：applet之间可以相互联系吗？
问题：JDBC连接的步骤是什么？
问题：try语句是如何决定哪个catch语句来处理异常的？

刚才等同事来着，闲的真是没事干了，翻译了一部分，虽然都比较简单，但是有的还真没见过。。。剩下的不管了，回家咯！下班！

5 楼 yejun 2010-05-12

君淋天下写道

老外面试题跟中文版面试大全中很多题目一致

我从来都没被老外面过。期待。

4 楼 luzl 2010-05-12

whaosoft 写道

你网上搜搜都应该有答案我估计没人帮你翻译这个嫩么多字了

我是放在这儿供自己慢慢学习翻译。

3 楼 dieslrae 2010-05-12

不就是把普通面试题变成E文了，看不懂这几年英语就算是白学了

2 楼 whaosoft 2010-05-12

你网上搜搜都应该有答案我估计没人帮你翻译这个嫩么多字了

1 楼君淋天下 2010-05-12

老外面试题跟中文版面试大全中很多题目一致

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