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Highlights of efficient Java programming tools and Java programming tools Java developers often find ways to write Java code faster and make programming easier. At present, more and more efficient programming tools are emerging on the market. Therefore, the following lists a series of tools, including the efficient tools that most developers have used, are using, or will certainly use in the future. The list includes the integrated development environ

", "green", "Black");This output: alert (acolor[3]);Then get: Blackb) toString, the array becomes a string:Alert (acolor.tostring ());This time output: Blue,yellow,green,blackc) Join, change the connector:Alert (Acolor.join ("-"). ToString ());This time output: Blue-yellow-green-blackd) Split, turn the string into an array:var smystring= "2015-07-15";var adate=smystring.split ("-");Alert (adate[2]);At this point the output is: 15e) Reverse the array elements to appear in reverse order:var acolor

1. When adding a third-party library, you need to be aware of the environmentDuplicate symbol _llvm.embedded.module in: /users/dengw/360cloud/xcode_code/application/oncenote/pods/ SHARESDK3/LIBRARIES/EXTENDS/WECHATSDK/LIBWECHATSDK.A (MTAEVENT.O) /users/dengw/360cloud/xcode_code/ APPLICATION/ONCENOTE/PODS/SHARESDK3/LIBRARIES/EXTENDS/WECHATSDK/LIBWECHATSDK.A (MTATESTSPEED.O) ld:24 Duplicate Symbols for Architecture X86_64clang:error:linker command failed with exit code 1 (use-v to see invoca

Java FAQ highlights-general Linux technology-Linux programming and kernel information. The following is a detailed description. Q: How to set the environment variables of Java 2 (JDK1.2? A: After installing Java 2, you need to set the PATH and JAVA_HOME environment variables. Different from JDK1.1: After setting the JAVA_HOME environment variable, JVM will automatically search for the system class library and the current PATH of the user. Java 2 env

select an element that has a multiple of 3 of the index value under each parent element.(5): Nth-child (3n+1) can select an element under each parent element that has an index value of (3n+1). (n starts from 1).EQ (index) matches only one element, whereas: Nth-child will match child elements for each parent element that meets the criteria. It should also be noted that the Nth-child (index)Index is starting at 1 and: EQ (index) starts at 0. Similarly: First and: First-child,:last and: Last-child

tools Spider Simulator: This tool can analyze your page and provide some suggestions for optimization. Image SEO Tool: This tool can check the ALT tag of the picture and provide some suggestions for optimization. Request Checker: Find out which resources and services you need to load on the page. Link checker: Check for internal, external, and invalid links on the page. HTTP Header check: Displays the HTTP response header for a Web page or resource. Social Checker:

Highlights of Centos mysql operations Problem: 1. The problem [root @ rekfan mysql] # service mysql restart occurs.MySQL server PID file cocould not be found! [Failed]Starting MySQL... The server quit without updating PID file (/usr/local/mysql/data/rekfan. pid). [failed] My solution: The/usr/local/mysql/data/rekfan. pid file has no write permission.Solution: grant permissions, execute "chown-R mysql: mysql/var/data" "chmod-R 755/usr/local/mysql/data"

Android highlights 34: android studioimport project download gradle-x.x.x-all.zip,gradle2.2.1all.zip Every time you open a github project, gradle is downloaded first. Each project has its own gradle build program, but it is really miserable to start a new project and download gradle again. So we can use the downloaded file to put it in the corresponding path and unzip it. The configuration directory of gradle is in ~ /. Gradle.View the contents in

[Strongest masterpiece in 2014] Android open-source school-highlights of excellent open-source projects, 2014 androidQY-OpenSource: helps new Android users learn how to use the open-source project home page: WorkshopAdded the smooth drop-down and refresh functions of XListView and more paging functions.Adding a ButterKnife View to the database can inject any view object. Of course, you need to provide the View root object.Simplify View Holder mode in

Highlights of HTML knowledge points In HTML, the Heading element has six levels of tags: In HTML, the p tag is used to mark a piece of text. The Section tab will automatically wrap the line, and there is a gap between the paragraph and the paragraph. The Strong: indicates the importance of the content, which is generally bold. Em: emphasize, representedItalics.The element can be nested. The deeper the hier

Android issue highlights forty-seven: Error: Execution failed for task #39;: app: packageRelease #39;.) Unable to compute hash The jna-related warnings are listed above when you encounter this problem during obfuscation compiling when using the jna jar package.You need to develop compilation rules in the proguard-rules.pro to ignore the jna-related package warnings. -keep class com.sun.jna.** { *; }-dontwarn com.sun.jna.** Note that if it is introdu

Highlights of vue errors and vue errors 1. vue error: less-loader css-loader style-loader Not Installed The possible cause is that less is not installed. 2. vuex error: Computed property "xxx" was assigned to but it has no setter When vuex is used, the imported state cannot be changed directly on the page. You need to change the state value in the mutation method, and then commit this method in the vue component. 3. iview error: When the col grid

Some of the highlights of the condensed PHP notes Happy to share, the following articles from the small part to share to everyone; I found a lot of PHP (PHP training PHP tutorial) programmers, especially learning is not a long time, do not know the essence of PHP. How did Perl become famous in the business world? Its powerful regular expression. and PHP? He is a language developed from the UNIX, of course, has inherited many features of Perl, while th

Android FAQ highlightsAndroid FAQ highlights (Continuous updates) SVN: Commit failed (details follow): svn: xxx is scheduled for addition, but is missingDescription:After deleting the folder, Click commit to submit, but the following error is displayed: "svn: Commit failed (details follow): svn: 'xxx' is scheduled for addition, but is missing ".Cause:Files submitted using SVN are marked as "add" and are waiting to be added to the repository. If you de

Oracle 8i RAC database common error diagnostics highlights ORA-1652 to ORA-1655 Simply put, the ORA-165X error message means that the tablespace does not have enough space to allocate, so an error is reported. These errors include a ora-1652, A ora-1653, A ora-1654, and a ora-1655. ORA-165X errors may be the most common ORACLE error message during routine maintenance, and you need to understand the environment and conditions that the problem is genera

program that can show the bottleneck of the code in general.39, Mod_zip can be used as Apache module, to compress your data instantly, and to reduce the data transfer volume by 80%.40, in the case can be replaced with file_get_contents file, fopen, feof, Fgets and other series of methods, as far as possible with the file_get_contents, because his efficiency is much higher! But pay attention to file_get_contents The PHP version problem when opening a URL file;41, as far as possible to file opera

exception, run a stack operation on an empty stack(8) FileNotFoundException: When the program view opens a file that does not exist. Read and write will throw an exception (seemingly not very much, a lot of read and write files. There is no self-created by themselves OH)(9) Other anomalies are rare. Abnormal processing see Java exception hierarchy and Java exceptions for the actual combat chapter (Trows and try Catch Dead Code)Summary: 1) is part of a section of project that you have done for y

Identity card identification application, to ensure that a variety of programs can be used, can use public cloud private cloud, but also the use of Android and iOS platform, etc., in the Internet industry common solutions can be solved perfectly. The scheme is as follows:1) based on Windows/linux platform2) based on the Android/ios Platform SDK (Jar package and. A static library) Android 2.3 and iOSMore than 6.0 versions.3) cloud-based recognitionMobile/Cloud ID identification, a variety of lic

.);(4) IllegalArgumentException: parameter illegal anomaly;(5) Indexoutofboundexception: Index out-of-bounds exception, exceeding the length of array, string, list collection;(6) NullPointerException: This thing is the most common, but also the most difficult to find exception: null pointer exception, access to a null object reference (can debug to locate the specific bit of the errorTo find the position of the null pointer or add an empty statement before this statement, and of course use other

+ + runtime automatically calls the corresponding version of operator Delete version cancels the memory allocation action. Therefore, if you customize a placement new, write the corresponding version of placement Delete (in addition to the pointer that needs to be freed, and also take the extra parameters of placement new as its arguments). Otherwise, if the memory allocation action needs to be canceled, the system will cause a memory leak because the corresponding placement delete version cann