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Description: stackoverflow上Java相关回答整理翻译. Contribute to XFORG/stackoverflow-java-top-qa development by creating an account on GitHub.

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https://github.com/XFORG/stackoverflow-java-top-qa#目录
Java += 操作符实质https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/java-operator.md
将InputStream转换为Stringhttps://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/read-convert-an-inputstream-to-a-string.md
将数组转换为Listhttps://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/create-arraylist-from-array.md
如何遍历map对象https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/iterate-through-a-hashmap.md
public，protected，private，不加修饰符。有什么区别呢？https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/in-java-whats-the-difference-between-public-default-protected-and-private.md
如何测试一个数组是否包含指定的值？https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-can-i-test-if-an-array-contains-a-certain-value.md
重写（Override）equlas和hashCode方法时应考虑的问题https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/what-issues-should-be-considered-when-overriding-equals-and-hashcode-in-java.md
从一个多层嵌套循环中直接跳出https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/breaking-out-of-nested-loops-in-java.md
如何将String转换为Inthttps://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/converting-string-to-int-in-java.md
如何分割（split）string字符串https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-to-split-a-string-in-java.md
在java中如何对比（compare）stringhttps://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-do-i-compare-strings-in-java.md
Map基于Value值排序https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-to-sort-a-mapkey-value-on-the-values-in-java.md
`HashMap和Hashtable的区别https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/differences-between-hashmap-and-hashtable.md
如何便捷地将两个数组合到一起https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-to-concatenate-two-arrays-in-java.md
Java 是否支持默认的参数值https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/does-java-support-default-parameter-values.md
Java 产生指定范围的随机数https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/generating-random-integers-in-a-range-with-Java.md
JavaBean 到底是什么https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/what-is-a-javabean-exactly.md
wait()和sleep()的区别https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/difference-between-wait-and-sleep.md
能否在一个构造器( constructor )中调用另一个构造器https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-do-i-call-one-constructor-from-another-in-java.md
finally 代码块总会被执行么https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/does-finally-always-execute-in-java.md
如何将String转换为enumhttps://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/convert-a-string-to-an-enum-in-java.md
在Java中声明数组https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/declare-array-in-java.md
反射是什么及其用途https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/what-is-reflection-and-why-is-it-useful.md
为什么不能用string类型进行switch判断https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/why-cant-i-switch-on-a-string.md
比较java枚举成员使用equal还是==https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/comparing-java-enum-members-or-equals.md
用java怎么创建一个文件并向该文件写文本内容https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-to-create-a-file-and-write-to-a-file-in-java.md
serialVersionUID 有什么作用？该如何使用？https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/what-is-a-serialversionuid-and-why-should-i-use-it.md
去掉烦人的“!=null"(判空语句https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/avoiding-null-statements-in-java.md
获取完整的堆栈信息https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/get-current-stack-trace-in-java.md
如何用一行代码初始化一个ArrayListhttps://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/initialization-of-an-arraylist-in-one-line.md
初始化静态maphttps://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-can-i-initialize-a-static-map.md
给3个布尔变量，当其中有2个或者2个以上为true才返回truehttps://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/check-if-at-least-two-out-of-three-booleans-are-true.md
输出 Java 数组最简单的方式https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/whats-the-simplest-way-to-print-a-java-array.md
为什么以下用随机生成的文字会得出 “hello world”?https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/why-does-this-code-using-random-strings-print-hello-world.md
什么在java中存放密码更倾向于char[]而不是Stringhttps://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/why-is-char-preferred-over-string-for-passwords-in-java.md
如何避免在JSP文件中使用Java代码https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-to-avoid-java-code-in-jsp-files.md
Java 源码里的设计模式https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/examples-of-gof-design-patterns-in-javas-core-libraries.md
如何产生一个随机的字母数字串作为 session 的唯一标识符https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-to-generate-a-random-alpha-numeric-string.md
如何创建单例https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/what-is-an-efficient-way-to-implement-a-singleton-in-java.md
实现Runnable接口 VS. 继承Thread类https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/implements-runnable-vs-extends-thread.md
我应该用哪一个@NotNull注解https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/which-notnull-java-annotation-should-i-use.md
怎样将堆栈追踪信息转换为字符串https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-can-i-convert-a-stack-trace-to-a-string.md
如何处理 java.lang.outOfMemoryError PermGen space errorhttps://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/dealing-with-java-lang-outofmemoryerror-permgen-space-error.md
如何使用java.net.URLConnection接收及发送HTTP请求https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/using-java-net-urlconnection-to-fire-and-handle-http-requests.md
LinkedList、ArrayList各自的使用场景，如何确认应该用哪一个呢？https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/when-to-use-linkedlist-over-arraylist.md
StringBuilder和StringBuffer有哪些区别呢https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/stringbuilder-and-stringbuffer.md
为什么处理排序的数组要比非排序的快https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/why-is-processing-a-sorted-array-faster-than-an-unsorted-array.md
如何测试 private 方法，变量或者内部类https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/how-to-test-a-class-that-has-private-methods-fields-or-inner-classes.md
在Android里面下载文件，并在ProgressDialog显示进度https://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/download-a-file-with-android-and-showing-the-progress-in-a-progressdialog.md
如何获取Android设备唯一IDhttps://github.com/giantray/stackoverflow-java-top-qa/blob/master/contents/is-there-a-unique-android-device-id.md
https://github.com/XFORG/stackoverflow-java-top-qa#待翻译问题链接还剩x问题
Why is subtracting these two times (in 1927) giving a strange result?http://stackoverflow.com/questions/6841333/why-is-subtracting-these-two-times-in-1927-giving-a-strange-result
Proper use cases for Android UserManager.isUserAGoat()?http://stackoverflow.com/questions/13375357/proper-use-cases-for-android-usermanager-isuseragoat
Creating a memory leak with Java [closed]http://stackoverflow.com/questions/6470651/creating-a-memory-leak-with-java
Why is printing “B” dramatically slower than printing “#”?http://stackoverflow.com/questions/21947452/why-is-printing-b-dramatically-slower-than-printing
How can I create an executable jar with dependencies using Maven?http://stackoverflow.com/questions/574594/how-can-i-create-an-executable-jar-with-dependencies-using-maven
Why is executing Java code in comments with certain Unicode characters allowed?http://stackoverflow.com/questions/30727515/why-is-executing-java-code-in-comments-with-certain-unicode-characters-allowed
Convert a String to an enum in Javahttp://stackoverflow.com/questions/604424/convert-a-string-to-an-enum-in-java
Android SDK installation doesn't find JDKhttp://stackoverflow.com/questions/4382178/android-sdk-installation-doesnt-find-jdk
Java inner class and static nested classhttp://stackoverflow.com/questions/70324/java-inner-class-and-static-nested-class
'Must Override a Superclass Method' Errors after importing a project into Eclipsehttp://stackoverflow.com/questions/1678122/must-override-a-superclass-method-errors-after-importing-a-project-into-eclips
Fastest way to determine if an integer's square root is an integerhttp://stackoverflow.com/questions/295579/fastest-way-to-determine-if-an-integers-square-root-is-an-integer
How to fix: Unsupported major.minor version 51.0 error?http://stackoverflow.com/questions/10382929/how-to-fix-unsupported-major-minor-version-51-0-error
How to generate a random alpha-numeric string?http://stackoverflow.com/questions/41107/how-to-generate-a-random-alpha-numeric-string
Comparing Java enum members: == or equals()?http://stackoverflow.com/questions/1750435/comparing-java-enum-members-or-equals
Failed to load the JNI shared Library (JDK)http://stackoverflow.com/questions/7352493/failed-to-load-the-jni-shared-library-jdk
How to create a Java String from the contents of a file?http://stackoverflow.com/questions/326390/how-to-create-a-java-string-from-the-contents-of-a-file
How do you assert that a certain exception is thrown in JUnit 4 tests?http://stackoverflow.com/questions/156503/how-do-you-assert-that-a-certain-exception-is-thrown-in-junit-4-tests
What exactly is Apache Camel?http://stackoverflow.com/questions/8845186/what-exactly-is-apache-camel
How can I permanently have line numbers in IntelliJ?http://stackoverflow.com/questions/13751/how-can-i-permanently-have-line-numbers-in-intellij
How do servlets work? Instantiation, shared variables and multithreadinghttp://stackoverflow.com/questions/3106452/how-do-servlets-work-instantiation-shared-variables-and-multithreading
Access restriction on class due to restriction on required library rt.jar?http://stackoverflow.com/questions/860187/access-restriction-on-class-due-to-restriction-on-required-library-rt-jar
How do I discover memory usage of my application in Android?http://stackoverflow.com/questions/2298208/how-do-i-discover-memory-usage-of-my-application-in-android
How can I generate an MD5 hash?http://stackoverflow.com/questions/415953/how-can-i-generate-an-md5-hash
Uncatchable ChuckNorrisExceptionhttp://stackoverflow.com/questions/13883166/uncatchable-chucknorrisexception
Can I add jars to maven 2 build classpath without installing them?http://stackoverflow.com/questions/364114/can-i-add-jars-to-maven-2-build-classpath-without-installing-them
Update Eclipse with Android development tools v. 23http://stackoverflow.com/questions/24437564/update-eclipse-with-android-development-tools-v-23
Setting multiple jars in java classpathhttp://stackoverflow.com/questions/219585/setting-multiple-jars-in-java-classpath
Iterating through a list, avoiding ConcurrentModificationException when removing in loophttp://stackoverflow.com/questions/223918/iterating-through-a-list-avoiding-concurrentmodificationexception-when-removing
Is null check needed before calling instanceofhttp://stackoverflow.com/questions/2950319/is-null-check-needed-before-calling-instanceof
How does the Java for each loop work?http://stackoverflow.com/questions/85190/how-does-the-java-for-each-loop-work
What is the Java equivalent for LINQ?http://stackoverflow.com/questions/1217228/what-is-the-java-equivalent-for-linq
Hibernate hbm2ddl.auto possible values and what they do?http://stackoverflow.com/questions/438146/hibernate-hbm2ddl-auto-possible-values-and-what-they-do
How to round a number to n decimal places in Javahttp://stackoverflow.com/questions/153724/how-to-round-a-number-to-n-decimal-places-in-java
How can I pad an integers with zeros on the left?http://stackoverflow.com/questions/473282/how-can-i-pad-an-integers-with-zeros-on-the-left
Sort ArrayList of custom Objects by propertyhttp://stackoverflow.com/questions/2784514/sort-arraylist-of-custom-objects-by-property
What's the difference between @Component, @Repository & @Service annotations in Spring?http://stackoverflow.com/questions/6827752/whats-the-difference-between-component-repository-service-annotations-in
Why is Java Vector class considered obsolete or deprecated?http://stackoverflow.com/questions/1386275/why-is-java-vector-class-considered-obsolete-or-deprecated
Efficiency of Java “Double Brace Initialization”?http://stackoverflow.com/questions/924285/efficiency-of-java-double-brace-initialization
Why does this go into an infinite loop?http://stackoverflow.com/questions/3831341/why-does-this-go-into-an-infinite-loop
When and how should I use a ThreadLocal variable?http://stackoverflow.com/questions/817856/when-and-how-should-i-use-a-threadlocal-variable
decompiling DEX into Java sourcecodehttp://stackoverflow.com/questions/1249973/decompiling-dex-into-java-sourcecode
How to create a generic array in Java?http://stackoverflow.com/questions/529085/how-to-create-a-generic-array-in-java
Why does Math.round(0.49999999999999994) return 1http://stackoverflow.com/questions/9902968/why-does-math-round0-49999999999999994-return-1
Eclipse: Set maximum line length for auto formatting?http://stackoverflow.com/questions/3697287/eclipse-set-maximum-line-length-for-auto-formatting
What is the difference between a soft reference and a weak reference in Java?http://stackoverflow.com/questions/299659/what-is-the-difference-between-a-soft-reference-and-a-weak-reference-in-java
What is the equivalent of the C++ Pair in Java?http://stackoverflow.com/questions/156275/what-is-the-equivalent-of-the-c-pairl-r-in-java
What is the difference between JSF, Servlet and JSP?http://stackoverflow.com/questions/2095397/what-is-the-difference-between-jsf-servlet-and-jsp
How do I “decompile” Java class files?http://stackoverflow.com/questions/272535/how-do-i-decompile-java-class-files
Useful Eclipse Java Code Templates [closed]http://stackoverflow.com/questions/1028858/useful-eclipse-java-code-templates
How to call SOAP web service in Androidhttp://stackoverflow.com/questions/297586/how-to-call-soap-web-service-in-android
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