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Java开发工具箱-JDK的安装与配置
一、JDK、JRE
| 术语名 | 缩写 | 解释 | | Java Development Kit | JDK | Java程序员用的工具包 | | Java Runtime Enviroment | JRE | Java程序的运行环境 |
二、下载、安装JDK 鼠标左键双击运行.exe,将会弹出引导程序安装JDK和JRE, 点击next,继续安装 点击change..选择你安装的路径，然后点击next 等待一会儿，会弹出安装jre的向导 可以选择安装路径，点击change选择安装路径，然后点击next 点击next steps去查看官网文档API等，点击close完成安装
三、环境变量配置 安装完成，cd到你的安装路径下 安装路径如下图： 那两个文件夹分别是JDK和JRE的安装位置，cd到JDK\bin中执行Java命令
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F:\Java\JDK\bin>dir Volume in drive F has no label. Volume Serial Number is 692A-C80C Directory of F:\Java\JDK\bin2017/01/14 12:04 <DIR> .2017/01/14 12:04 <DIR> ..2017/01/14 12:04 15,904 appletviewer.exe2017/01/14 12:04 16,416 extcheck.exe2017/01/14 12:04 16,416 idlj.exe2017/01/14 12:04 34,336 jabswitch.exe2017/01/14 12:04 15,904 jar.exe2017/01/14 12:04 16,416 jarsigner.exe2017/01/14 12:04 15,904 java-rmi.exe2017/01/14 12:04 206,880 java.exe2017/01/14 12:04 15,904 javac.exe2017/01/14 12:04 16,416 javadoc.exe2017/01/14 12:04 133,664 javafxpackager.exe2017/01/14 12:04 15,904 javah.exe2017/01/14 12:04 15,904 javap.exe2017/01/14 12:04 133,664 javapackager.exe2017/01/14 12:04 206,880 javaw.exe2017/01/14 12:04 318,496 javaws.exe2017/01/14 12:04 15,904 jcmd.exe2017/01/14 12:04 16,928 jconsole.exe2017/01/14 12:04 16,416 jdb.exe2017/01/14 12:04 15,904 jdeps.exe2017/01/14 12:04 15,904 jhat.exe2017/01/14 12:04 16,416 jinfo.exe2017/01/14 12:04 15,904 jjs.exe2017/01/14 12:04 174,624 jli.dll2017/01/14 12:04 16,416 jmap.exe2017/01/14 12:04 321,568 jmc.exe2017/01/14 12:04 417 jmc.ini2017/01/14 12:04 15,904 jps.exe2017/01/14 12:04 16,416 jrunscript.exe2017/01/14 12:04 16,416 jsadebugd.exe2017/01/14 12:04 16,416 jstack.exe2017/01/14 12:04 15,904 jstat.exe2017/01/14 12:04 15,904 jstatd.exe2017/01/14 12:04 196,640 jvisualvm.exe2017/01/14 12:04 16,416 keytool.exe2017/01/14 12:04 16,416 kinit.exe2017/01/14 12:04 16,416 klist.exe2017/01/14 12:04 16,416 ktab.exe2017/01/14 12:04 829,264 msvcr100.dll2017/01/14 12:04 16,416 native2ascii.exe2017/01/14 12:04 16,416 orbd.exe2017/01/14 12:04 16,416 pack200.exe2017/01/14 12:04 16,416 policytool.exe2017/01/14 12:04 15,904 rmic.exe2017/01/14 12:04 15,904 rmid.exe2017/01/14 12:04 16,416 rmiregistry.exe2017/01/14 12:04 16,416 schemagen.exe2017/01/14 12:04 16,416 serialver.exe2017/01/14 12:04 16,416 servertool.exe2017/01/14 12:04 16,416 tnameserv.exe2017/01/14 12:04 197,152 unpack200.exe2017/01/14 12:04 15,904 wsgen.exe2017/01/14 12:04 16,416 wsimport.exe2017/01/14 12:04 16,416 xjc.exe 54 File(s) 3,435,377 bytes 2 Dir(s) 51,645,952,000 bytes freeF:\Java\JDK\bin>java -versionjava version "1.8.0_111"Java(TM) SE Runtime Environment (build 1.8.0_111-b14)Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)F:\Java\JDK\bin>javacUsage: javac <options> <source files>where possible options include: -g Generate all debugging info -g:none Generate no debugging info -g:{lines,vars,source} Generate only some debugging info -nowarn Generate no warnings -verbose Output messages about what the compiler is doing -deprecation Output source locations where deprecated APIs are used -classpath <path> Specify where to find user class files and annotation processors -cp <path> Specify where to find user class files and annotation processors -sourcepath <path> Specify where to find input source files -bootclasspath <path> Override location of bootstrap class files -extdirs <dirs> Override location of installed extensions -endorseddirs <dirs> Override location of endorsed standards path -proc:{none,only} Control whether annotation processing and/or compilation is done. -processor <class1>[,<class2>,<class3>...] Names of the annotation processors to run; bypasses default discovery process -processorpath <path> Specify where to find annotation processors -parameters Generate metadata for reflection on method parameters -d <directory> Specify where to place generated class files -s <directory> Specify where to place generated source files -h <directory> Specify where to place generated native header files -implicit:{none,class} Specify whether or not to generate class files for implicitly referenced files -encoding <encoding> Specify character encoding used by source files -source <release> Provide source compatibility with specified release[url=][/url]
这样做比较麻烦，没次要用的时候，都需要到这个安装位置下来 我们需要添加安装的bin目录到系统环境变量中， 复制路径后，在系统环境变量中找到path,然后添加进去 之前安装的路径的JDK的bin路径就添加到系统环境变量中啦 F:\Java\JDK\bin 在cmd下验证一下，任意路径
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C:\Windows\system32>java -versionjava version "1.8.0_111"Java(TM) SE Runtime Environment (build 1.8.0_111-b14)Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)C:\Windows\system32>E:E:\>java -versionjava version "1.8.0_111"Java(TM) SE Runtime Environment (build 1.8.0_111-b14)Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)E:\>javacUsage: javac <options> <source files>where possible options include: -g Generate all debugging info -g:none Generate no debugging info -g:{lines,vars,source} Generate only some debugging info -nowarn Generate no warnings -verbose Output messages about what the compiler is doing -deprecation Output source locations where deprecated APIs are used -classpath <path> Specify where to find user class files and annotation processors -cp <path> Specify where to find user class files and annotation processors -sourcepath <path> Specify where to find input source files -bootclasspath <path> Override location of bootstrap class files -extdirs <dirs> Override location of installed extensions -endorseddirs <dirs> Override location of endorsed standards path -proc:{none,only} Control whether annotation processing and/or compilation is done. -processor <class1>[,<class2>,<class3>...] Names of the annotation processors to run; bypasses default discovery process -processorpath <path> Specify where to find annotation processors -parameters Generate metadata for reflection on method parameters -d <directory> Specify where to place generated class files -s <directory> Specify where to place generated source files -h <directory> Specify where to place generated native header files -implicit:{none,class} Specify whether or not to generate class files for implicitly referenced files -encoding <encoding> Specify character encoding used by source files -source <release> Provide source compatibility with specified release -target <release> Generate class files for specific VM version -profile <profile> Check that API used is available in the specified profile -version Version information -help Print a synopsis of standard options -Akey[=value] Options to pass to annotation processors -X Print a synopsis of nonstandard options -J<flag> Pass <flag> directly to the runtime system -Werror Terminate compilation if warnings occur @<filename> Read options and filenames from file[url=][/url]
四、编写hello world程序运行一下， 创建文件HelloWorld.java， 文件名字与类名对应，文件类型.java public class HelloWorld{ public static void main(String[] args) { System.out.println("Hello World"); }}
cd到helloworld.java路径下
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E:\Java>dir Volume in drive E has no label. Volume Serial Number is 35EE-5207 Directory of E:\Java2017/01/14 12:49 <DIR> .2017/01/14 12:49 <DIR> ..2017/01/14 12:49 130 HelloWorld.java2016/07/12 09:18 <DIR> httpcomponents-client-4.5.22016/07/12 09:17 3,047,752 httpcomponents-client-4.5.2-bin.zip2016/07/12 08:59 1,643,553 httpcomponents-client-4.5.2-src.zip2015/12/14 08:35 <DIR> sqljdbc_4.2 3 File(s) 4,691,435 bytes 4 Dir(s) 40,363,429,888 bytes freeE:\Java>javac HelloWorlderror: Class names, 'HelloWorld', are only accepted if annotation processing is explicitly requested1 errorE:\Java>javac HelloWorld.javaE:\Java>java HelloWorldHello World[url=][/url]
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发表于 2018-11-29 14:48:48
