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目录http://stackoverflow.com/questions/tagged/java?page=1&sort=votes&pagesize=15
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#目录
1、为什么处理排序过得数组比没有排序的数组快http://stackoverflow.com/questions/11227809/why-is-processing-a-sorted-array-faster-than-an-unsorted-array
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#1为什么处理排序过得数组比没有排序的数组快
2、为什么在1927年的两个时间相减会产生奇怪的结果http://stackoverflow.com/questions/6841333/why-is-subtracting-these-two-times-in-1927-giving-a-strange-result
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#2为什么在1927年的两个时间相减会产生奇怪的结果
3、Java是传引用还是传值http://stackoverflow.com/questions/40480/is-java-pass-by-reference-or-pass-by-value
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#3java是传引用还是传值
4、Java += 操作符http://stackoverflow.com/questions/8710619/java-operator
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#4java--操作符
5、避免！=null 声明http://stackoverflow.com/questions/271526/avoiding-null-statements
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#5避免null-声明
6、Android适当的用例UserManager.isUserAGoat()http://stackoverflow.com/questions/13375357/proper-use-cases-for-android-usermanager-isuseragoat
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#6android适当的用例usermanagerisuseragoat
7、HashMap和HaspTable的区别http://stackoverflow.com/questions/40471/differences-between-hashmap-and-hashtable
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#7hashmap和hasptable的区别
8、InputStream转换为Stringhttp://stackoverflow.com/questions/309424/read-convert-an-inputstream-to-a-string
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#8inputstream转换为string
9、为什么在存密码时char[]要优于Stringhttp://stackoverflow.com/questions/8881291/why-is-char-preferred-over-string-for-passwords-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#9为什么在存密码时char要优于string
10、遍历HashMaphttp://stackoverflow.com/questions/1066589/iterate-through-a-hashmap
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#10遍历hashmap
11、用数组创建一个ArrayListhttp://stackoverflow.com/questions/157944/create-arraylist-from-array
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#11用数组创建一个arraylist
12、产生特定范围的随机数http://stackoverflow.com/questions/363681/generating-random-integers-in-a-specific-range
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#12产生特定范围的随机数
13、创建内存泄露？http://stackoverflow.com/questions/6470651/creating-a-memory-leak-with-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#13创建内存泄露
14、LinkedList和ArrayList区别http://stackoverflow.com/questions/322715/when-to-use-linkedlist-over-arraylist
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#14linkedlist和arraylist区别
15、为什么动态的答应B比答应#慢http://stackoverflow.com/questions/21947452/why-is-printing-b-dramatically-slower-than-printing
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#15为什么动态的答应b比答应慢
16、serialVersionUID是什么http://stackoverflow.com/questions/285793/what-is-a-serialversionuid-and-why-should-i-use-it
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#16serialversionuid是什么
17、把字符串转换为Inthttp://stackoverflow.com/questions/5585779/converting-string-to-int-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#17把字符串转换为int
18、public、default、protected、private的区别http://stackoverflow.com/questions/215497/difference-between-public-default-protected-and-private
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#18publicdefaultprotectedprivate的区别
19、Android设备是否有唯一的IDhttp://stackoverflow.com/questions/2785485/is-there-a-unique-android-device-id
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#19android设备是否有唯一的id
20、怎么样测试私有方法，字段和内部类http://stackoverflow.com/questions/34571/how-to-test-a-class-that-has-private-methods-fields-or-inner-classes
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#20怎么样测试私有方法字段和内部类
21、怎样有效的遍历Map中的entryhttp://stackoverflow.com/questions/46898/how-to-efficiently-iterate-over-each-entry-in-a-map
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#21怎样有效的遍历map中的entry
22、使用java.net.URLConnection处理HTTP requestshttp://stackoverflow.com/questions/2793150/using-java-net-urlconnection-to-fire-and-handle-http-requests
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#22使用javaneturlconnection处理http-requests
23、为什么这段代码使用随机字符串答应"hello world"http://stackoverflow.com/questions/15182496/why-does-this-code-using-random-strings-print-hello-world
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#23为什么这段代码使用随机字符串答应hello-world
24、 如果使用Maven创建外部JARhttp://stackoverflow.com/questions/574594/how-can-i-create-an-executable-jar-with-dependencies-using-maven
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#24-如果使用maven创建外部jar
25、怎样判断数组包含一个特定的值http://stackoverflow.com/questions/1128723/how-can-i-test-if-an-array-contains-a-certain-value
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#25怎样判断数组包含一个特定的值
26、如何在JSP中避免java代码http://stackoverflow.com/questions/3177733/how-to-avoid-java-code-in-jsp-files
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#26如何在jsp中避免java代码
27、一行代码初始化ArrayListhttp://stackoverflow.com/questions/1005073/initialization-of-an-arraylist-in-one-line
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#27一行代码初始化arraylist
28、finally在java一定会被执行吗http://stackoverflow.com/questions/65035/does-finally-always-execute-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#28finally在java一定会被执行吗
29、"implements Runnable"和"extends Thread"http://stackoverflow.com/questions/541487/implements-runnable-vs-extends-thread
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#29implements-runnable和extends-thread
30、如何在一个构造函数中调用另一个http://stackoverflow.com/questions/285177/how-do-i-call-one-constructor-from-another-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#30如何在一个构造函数中调用另一个
31、String转换为Enumhttp://stackoverflow.com/questions/604424/convert-a-string-to-an-enum-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#31string转换为enum
32、在//后代码会被执行http://stackoverflow.com/questions/30727515/why-is-executing-java-code-in-comments-with-certain-unicode-characters-allowed
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#32在后代码会被执行
33、处理java.lang.OutOfMemoryError:PermGen space错误http://stackoverflow.com/questions/88235/dealing-with-java-lang-outofmemoryerror-permgen-space-error
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#33处理javalangoutofmemoryerrorpermgen-space错误
34、退出嵌套循环http://stackoverflow.com/questions/886955/breaking-out-of-nested-loops-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#34退出嵌套循环
35、Android SDK 安装后找不到JDKhttp://stackoverflow.com/questions/4382178/android-sdk-installation-doesnt-find-jdk
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#35android-sdk-安装后找不到jdk
36、Java内部类和嵌套类http://stackoverflow.com/questions/70324/java-inner-class-and-static-nested-class
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#36java内部类和嵌套类
37、在导入项目后出现必须覆盖超类方法的错误http://stackoverflow.com/questions/1678122/must-override-a-superclass-method-errors-after-importing-a-project-into-eclips
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#37在导入项目后出现必须覆盖超类方法的错误
38、错误Unsupported major.minor version 51.0 errorhttp://stackoverflow.com/questions/10382929/how-to-fix-unsupported-major-minor-version-51-0-error
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#38错误unsupported-majorminor-version-510-error
39、声明数组http://stackoverflow.com/questions/1200621/declare-array-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#39声明数组
40、反射的作用http://stackoverflow.com/questions/37628/what-is-reflection-and-why-is-it-useful
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#40反射的作用
41、Map值排序http://stackoverflow.com/questions/109383/sort-a-mapkey-value-by-values-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#41map值排序
42、产生字母数字型随机数http://stackoverflow.com/questions/41107/how-to-generate-a-random-alpha-numeric-string
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#42产生字母数字型随机数
43、判断一个数的根号是整数http://stackoverflow.com/questions/295579/fastest-way-to-determine-if-an-integers-square-root-is-an-integer
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#43判断一个数的根号是整数
44、用==或者equals()比较enum成员http://stackoverflow.com/questions/1750435/comparing-java-enum-members-or-equals
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#44用或者equals比较enum成员
45、最简单的答应数组http://stackoverflow.com/questions/409784/whats-the-simplest-way-to-print-a-java-array
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#45最简单的答应数组
46、java是否支持默认参数值http://stackoverflow.com/questions/997482/does-java-support-default-parameter-values
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#46java是否支持默认参数值
47、接口和抽象类区别http://stackoverflow.com/questions/1913098/what-is-the-difference-between-an-interface-and-abstract-class
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#47接口和抽象类区别
48、IntelliJ持久化行号http://stackoverflow.com/questions/13751/how-can-i-permanently-have-line-numbers-in-intellij
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#48intellij持久化行号
49、StringBuilder and StringBufferhttp://stackoverflow.com/questions/355089/stringbuilder-and-stringbuffer
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#49stringbuilder-and-stringbuffer
50、怎么连接两个数组http://stackoverflow.com/questions/80476/how-can-i-concatenate-two-arrays-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#50怎么连接两个数组
51、在JUit中怎么断言异常http://stackoverflow.com/questions/156503/how-do-you-assert-that-a-certain-exception-is-thrown-in-junit-4-tests
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#51在juit中怎么断言异常
52、字符串比较http://stackoverflow.com/questions/513832/how-do-i-compare-strings-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#52字符串比较
53、根据文件的内容创建字符串http://stackoverflow.com/questions/326390/how-to-create-a-java-string-from-the-contents-of-a-file
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#53根据文件的内容创建字符串
54、Failed to load the JNI shared Library (JDK)http://stackoverflow.com/questions/7352493/failed-to-load-the-jni-shared-library-jdk
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#54failed-to-load-the-jni-shared-library-jdk
55、JavaBeanhttp://stackoverflow.com/questions/3295496/what-is-a-javabean-exactly
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#55javabean
56、为什么我不能打开一个字符串http://stackoverflow.com/questions/338206/why-cant-i-switch-on-a-string
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#56为什么我不能打开一个字符串
57、stack trace转换Stringhttp://stackoverflow.com/questions/1149703/how-can-i-convert-a-stack-trace-to-a-string
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#57stack-trace转换string
58、java核心代码的Gof设计模式例子http://stackoverflow.com/questions/1673841/examples-of-gof-design-patterns-in-javas-core-libraries
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#58java核心代码的gof设计模式例子
59、Apache Camelhttp://stackoverflow.com/questions/8845186/what-exactly-is-apache-camel
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#59apache-camel
60、java为什么会有临时变量http://stackoverflow.com/questions/910374/why-does-java-have-transient-variables
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#60java为什么会有临时变量
61、Servlet 怎么工作http://stackoverflow.com/questions/3106452/how-do-servlets-work-instantiation-shared-variables-and-multithreading
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#61servlet-怎么工作
62、重写equals和hashCodehttp://stackoverflow.com/questions/27581/what-issues-should-be-considered-when-overriding-equals-and-hashcode-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#62重写equals和hashcode
63、得到当前stack tracehttp://stackoverflow.com/questions/1069066/get-current-stack-trace-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#63得到当前stack-trace
64、foreach工作原理http://stackoverflow.com/questions/85190/how-does-the-java-for-each-loop-work
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#64foreach工作原理
65、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
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#65access-restriction-on-class-due-to-restriction-on-required-library-rtjar
66、wait()和sleep()区别http://stackoverflow.com/questions/1036754/difference-between-wait-and-sleep
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#66wait和sleep区别
67、产生MD5hashhttp://stackoverflow.com/questions/415953/how-can-i-generate-an-md5-hash
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#67产生md5hash
68、在调用instanceof之前是否要检测is nullhttp://stackoverflow.com/questions/2950319/is-null-check-needed-before-calling-instanceof
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#68在调用instanceof之前是否要检测is-null
69、Download a file with Android, and showing the progress in a ProgressDialoghttp://stackoverflow.com/questions/3028306/download-a-file-with-android-and-showing-the-progress-in-a-progressdialog
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#69download-a-file-with-android-and-showing-the-progress-in-a-progressdialog
70、初始化静态Maphttp://stackoverflow.com/questions/507602/how-can-i-initialize-a-static-map
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#70初始化静态map
71、怎么发现Android应用的内存只用量http://stackoverflow.com/questions/2298208/how-do-i-discover-memory-usage-of-my-application-in-android
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#71怎么发现android应用的内存只用量
72、在遍历list的时候，remove一个值，避免出现concurrenModificationExcetiionhttp://stackoverflow.com/questions/223918/iterating-through-a-list-avoiding-concurrentmodificationexception-when-removing
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#72在遍历list的时候remove一个值避免出现concurrenmodificationexcetiion
73、在java classpath中设置多行jarshttp://stackoverflow.com/questions/219585/setting-multiple-jars-in-java-classpath
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#73在java-classpath中设置多行jars
74、Hibernate hbm2ddl.auto possible values and what they dohttp://stackoverflow.com/questions/438146/hibernate-hbm2ddl-auto-possible-values-and-what-they-do
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#74hibernate-hbm2ddlauto-possible-values-and-what-they-do
75、split a Stringhttp://stackoverflow.com/questions/3481828/how-to-split-a-string-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#75split-a-string
76、LINQ for javahttp://stackoverflow.com/questions/1217228/what-is-the-java-equivalent-for-linq
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#76linq-for-java
77、What's the difference between @Component, @Repository & @Service annotations in Springhttp://stackoverflow.com/questions/6827752/whats-the-difference-between-component-repository-service-annotations-in
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#77whats-the-difference-between-component-repository--service-annotations-in-spring
78、Can I add jars to maven 2 build classpath without installing themhttp://stackoverflow.com/questions/364114/can-i-add-jars-to-maven-2-build-classpath-without-installing-them
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#78can-i-add-jars-to-maven-2-build-classpath-without-installing-them
79、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
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#79how-to-round-a-number-to-n-decimal-places-in-java
80、对ArrayList的对象属性排序http://stackoverflow.com/questions/2784514/sort-arraylist-of-custom-objects-by-property
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#80对arraylist的对象属性排序
81、创建和写文件http://stackoverflow.com/questions/2885173/how-to-create-a-file-and-write-to-a-file-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#81创建和写文件
82、Update Eclipse with Android development tools v. 23http://stackoverflow.com/questions/24437564/update-eclipse-with-android-development-tools-v-23
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#82update-eclipse-with-android-development-tools-v-23
83、Uncatchable ChuckNorrisExceptionhttp://stackoverflow.com/questions/13883166/uncatchable-chucknorrisexception
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#83uncatchable-chucknorrisexception
84、怎么在一个整数的左边填充0http://stackoverflow.com/questions/473282/how-can-i-pad-an-integers-with-zeros-on-the-left
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#84怎么在一个整数的左边填充0
85、创建泛型数组http://stackoverflow.com/questions/529085/how-to-create-a-generic-array-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#85创建泛型数组
86、判断三个以上为true条件http://stackoverflow.com/questions/3076078/check-if-at-least-two-out-of-three-booleans-are-true
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#86判断三个以上为true条件
87、ThreadLocal variablehttp://stackoverflow.com/questions/817856/when-and-how-should-i-use-a-threadlocal-variable
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#87threadlocal-variable
88、JSF、Servlet、JSP区别http://stackoverflow.com/questions/2095397/what-is-the-difference-between-jsf-servlet-and-jsp
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#88jsfservletjsp区别
89、为什么java向量类被认为是过时的和被废弃http://stackoverflow.com/questions/1386275/why-is-java-vector-class-considered-obsolete-or-deprecated
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#89为什么java向量类被认为是过时的和被废弃
90、反编译DEX为源码http://stackoverflow.com/questions/1249973/decompiling-dex-into-java-sourcecode
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#90反编译dex为源码
91、ArrayList转换为String[]数组http://stackoverflow.com/questions/5374311/convert-arrayliststring-to-string-array
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#91arraylist转换为string数组
92、软引用和弱引用的区别http://stackoverflow.com/questions/299659/what-is-the-difference-between-a-soft-reference-and-a-weak-reference-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#92软引用和弱引用的区别
93、Efficiency of Java “Double Brace Initialization”http://stackoverflow.com/questions/924285/efficiency-of-java-double-brace-initialization
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#93efficiency-of-java-double-brace-initialization
94、实现单例模式的最有效方法http://stackoverflow.com/questions/70689/what-is-an-efficient-way-to-implement-a-singleton-pattern-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#94实现单例模式的最有效方法
95、java中什么相当于C++的http://stackoverflow.com/questions/156275/what-is-the-equivalent-of-the-c-pairl-r-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#95java中什么相当于c的lr
96、从纯文本文件中读http://stackoverflow.com/questions/4716503/reading-a-plain-text-file-in-java
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#96从纯文本文件中读
97、Which @NotNull Java annotation should I usehttp://stackoverflow.com/questions/4963300/which-notnull-java-annotation-should-i-use
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#97which-notnull-java-annotation-should-i-use
98、为什么这段代码陷入无限循环http://stackoverflow.com/questions/3831341/why-does-this-go-into-an-infinite-loop
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#98为什么这段代码陷入无限循环
99、Eclipse: Set maximum line length for auto formattinghttp://stackoverflow.com/questions/3697287/eclipse-set-maximum-line-length-for-auto-formatting
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#99eclipse-set-maximum-line-length-for-auto-formatting
100、Why does Math.round(0.49999999999999994) return 1http://stackoverflow.com/questions/9902968/why-does-math-round0-49999999999999994-return-1
https://github.com/akuma/stackoverflow-java-top-qa/blob/master/目录.md#100why-does-mathround049999999999999994-return-1
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