stackoverflow-Java-top-qa

对stackoverflow上Java相关、投票数TOP100的问答进行翻译
翻译过程中，会有自己的一些加工，例如整合多个答案、删除冗余的文字、加上自己的验证心得等等
欢迎大家一起来翻译

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目录

基础语法

• Java是按值传递还是按引用传递
• Java += 操作符实质
• 将InputStream转换为String
• 将数组转换为List
• 如何遍历map对象
• public，protected，private，不加修饰符。有什么区别呢？
• 如何判断数组Array是否包含指定的值？
• 重写（Override）equlas和hashCode方法时应考虑的问题
• 从一个多层嵌套循环中直接退出

代码规范

• 去掉烦人的“!=null"(判空语句

网络

• 如何使用java.net.URLConnection接收及发送HTTP请求

性能

• LinkedList、ArrayList各自的使用场景，如何确认应该用哪一个呢？
• StringBuilder和StringBuffer有哪些区别呢

待翻译问题链接(还剩x问题)

• Why is processing a sorted array faster than an unsorted array?

• Why is subtracting these two times (in 1927) giving a strange result?

• Proper use cases for Android UserManager.isUserAGoat()?

• Differences between HashMap and Hashtable?

• Creating a memory leak with Java [closed]

• Why is char[] preferred over String for passwords?

• Generating random integers in a range with Java

• Why is printing “B” dramatically slower than printing “#”?

• What is a serialVersionUID and why should I use it?

• Converting String to int in Java?

• Is there a unique Android device ID?

• How to test a class that has private methods, fields or inner classes

• Why does this code using random strings print “hello world”?

• How can I create an executable jar with dependencies using Maven?

• How to avoid Java code in JSP files?

• In Java, how can I test if an Array contains a certain value?

• Why is executing Java code in comments with certain Unicode characters allowed?

• Dealing with “java.lang.OutOfMemoryError: PermGen space” error

• “implements Runnable” vs. “extends Thread”

• Does finally always execute in Java?

• Convert a String to an enum in Java

• Android SDK installation doesn't find JDK

• How do I call one constructor from another in Java?

• Initialization of an ArrayList in one line

• Java inner class and static nested class

• 'Must Override a Superclass Method' Errors after importing a project into Eclipse

• How do I compare strings in Java?

• How to sort a Map<Key, Value> on the values in Java?

• Declare array in Java?

• Fastest way to determine if an integer's square root is an integer

• How to fix: Unsupported major.minor version 51.0 error?

• What is reflection and why is it useful?

• How to generate a random alpha-numeric string?

• Examples of GoF Design Patterns in Java's core libraries

• Comparing Java enum members: == or equals()?

• Failed to load the JNI shared Library (JDK)

• Does Java support default parameter values?

• How to concatenate two arrays in Java?

• What's the simplest way to print a Java array?

• Why can't I switch on a String?

• [What issues should be considered when overriding equals and

• How to create a Java String from the contents of a file?

• Why does Java have transient variables?

• How can I convert a stack trace to a string?

• How do you assert that a certain exception is thrown in JUnit 4 tests?

• What is a JavaBean exactly?

• What exactly is Apache Camel?

• Get current stack trace in Java

• How can I permanently have line numbers in IntelliJ?

• How do servlets work? Instantiation, shared variables and multithreading

• Access restriction on class due to restriction on required library rt.jar?

• How can I Initialize a static Map?

• How do I discover memory usage of my application in Android?

• How can I generate an MD5 hash?

• Download a file with Android, and showing the progress in a ProgressDialog

• Uncatchable ChuckNorrisException

• Can I add jars to maven 2 build classpath without installing them?

• Update Eclipse with Android development tools v. 23

• Difference between wait() and sleep()

• Setting multiple jars in java classpath

• Iterating through a list, avoiding ConcurrentModificationException when removing in loop

• Is null check needed before calling instanceof

• How does the Java for each loop work?

• What is the Java equivalent for LINQ?

• Hibernate hbm2ddl.auto possible values and what they do?

• Check if at least two out of three booleans are true

• How to round a number to n decimal places in Java

• How can I pad an integers with zeros on the left?

• Sort ArrayList of custom Objects by property

• What's the difference between @Component, @Repository & @Service annotations in Spring?

• Why is Java Vector class considered obsolete or deprecated?

• Efficiency of Java “Double Brace Initialization”?

• Why does this go into an infinite loop?

• When and how should I use a ThreadLocal variable?

• decompiling DEX into Java sourcecode

• How to create a generic array in Java?

• Why does Math.round(0.49999999999999994) return 1

• How to split a string in Java

• Eclipse: Set maximum line length for auto formatting?

• What is the difference between a soft reference and a weak reference in Java?

• How to create a file and write to a file in Java?

• What is the equivalent of the C++ Pair<L,R> in Java?

• What is the difference between JSF, Servlet and JSP?

• How do I “decompile” Java class files?

• What is an efficient way to implement a singleton pattern in Java?

• Useful Eclipse Java Code Templates [closed]

• Which @NotNull Java annotation should I use?

• How to call SOAP web service in Android

已翻译问题链接(去重)

qa-tuple.md:问题 (http://stackoverflow.com/questions/2970608/what-are-named-tuples-in-python)

contributors

thx a lot:)

• giantray

• wklken

more link

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To Be Continue ...

giantray

Email: [email protected]

Blog: http://blog.csdn.net/lizeyang

2015-08-18 于珠海