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
官网下载链接:http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
百度网盘下载链接：http://pan.baidu.com/s/1bLnANG
鼠标右键双击运行.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
F:\Java\JDK\bin>dir
Volume in drive F has no label.
Volume Serial Number is 692A-C80C
Directory of F:\Java\JDK\bin
// : <DIR> .
// : <DIR> ..
// : , appletviewer.exe
// : , extcheck.exe
// : , idlj.exe
// : , jabswitch.exe
// : , jar.exe
// : , jarsigner.exe
// : , java-rmi.exe
// : , java.exe
// : , javac.exe
// : , javadoc.exe
// : , javafxpackager.exe
// : , javah.exe
// : , javap.exe
// : , javapackager.exe
// : , javaw.exe
// : , javaws.exe
// : , jcmd.exe
// : , jconsole.exe
// : , jdb.exe
// : , jdeps.exe
// : , jhat.exe
// : , jinfo.exe
// : , jjs.exe
// : , jli.dll
// : , jmap.exe
// : , jmc.exe
// : jmc.ini
// : , jps.exe
// : , jrunscript.exe
// : , jsadebugd.exe
// : , jstack.exe
// : , jstat.exe
// : , jstatd.exe
// : , jvisualvm.exe
// : , keytool.exe
// : , kinit.exe
// : , klist.exe
// : , ktab.exe
// : , msvcr100.dll
// : , native2ascii.exe
// : , orbd.exe
// : , pack200.exe
// : , policytool.exe
// : , rmic.exe
// : , rmid.exe
// : , rmiregistry.exe
// : , schemagen.exe
// : , serialver.exe
// : , servertool.exe
// : , tnameserv.exe
// : , unpack200.exe
// : , wsgen.exe
// : , wsimport.exe
// : , xjc.exe
File(s) ,, bytes
Dir(s) ,,, bytes free
F:\Java\JDK\bin>java -version
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) -Bit Server VM (build 25.111-b14, mixed mode)
F:\Java\JDK\bin>javac
Usage: 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
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
C:\Windows\system32>java -version
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) -Bit Server VM (build 25.111-b14, mixed mode)
C:\Windows\system32>E:
E:\>java -version
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) -Bit Server VM (build 25.111-b14, mixed mode)
E:\>javac
Usage: 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
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
E:\Java>dir
Volume in drive E has no label.
Volume Serial Number is 35EE-5207
Directory of E:\Java
2017/01/14 12:49 <DIR> .
2017/01/14 12:49 <DIR> ..
2017/01/14 12:49 130 HelloWorld.java
2016/07/12 09:18 <DIR> httpcomponents-client-4.5.2
2016/07/12 09:17 3,047,752 httpcomponents-client-4.5.2-bin.zip
2016/07/12 08:59 1,643,553 httpcomponents-client-4.5.2-src.zip
2015/12/14 08:35 <DIR> sqljdbc_4.2
3 File(s) 4,691,435 bytes
4 Dir(s) 40,363,429,888 bytes free
E:\Java>javac HelloWorld
error: Class names, 'HelloWorld', are only accepted if annotation processing is explicitly requested
1 error
E:\Java>javac HelloWorld.java
E:\Java>java HelloWorld
Hello World