JDK安装配置以及在dos命令行下执行java程序

 

 1、安装jdk

 

• 下载jdk的安装包点击安装，安装完成后会在安装目录下生成lib和bin文件夹
  
• 配置环境变量：点击计算机-->属性-->高级系统设置-->环境变量
• 找到PATH，在后面添加JDK安装目录bin的路径:D:\Program Files\Java\jdk1.6.0_45\bin
• 新建CLASSPATH，配置JDK安装目录lib的路径:.D:\Program Files\Java\jdk1.6.0_45\lib

2、新建java文件Test.java,假设保存在C盘java文件夹下

 

public class Test{

    public static void mian(String[] args){

        System.out.println("Hello World") ;

    }

}

 

3、按Win+R进入dos命令行下，输入java，出现：

 

Usage: java [-options] class [args...]
           (to execute a class)
   or  java [-options] -jar jarfile [args...]
           (to execute a jar file)

where options include:
    -server       to select the "server" VM
    -hotspot      is a synonym for the "server" VM  [deprecated]
                  The default VM is server.

    -cp <class search path of directories and zip/jar files>
    -classpath <class search path of directories and zip/jar files>
                  A ; separated list of directories, JAR archives,
                  and ZIP archives to search for class files.
    -D<name>=<value>
                  set a system property
    -verbose[:class|gc|jni]
                  enable verbose output
    -version      print product version and exit
    -version:<value>
                  require the specified version to run
    -showversion  print product version and continue
    -jre-restrict-search | -jre-no-restrict-search
                  include/exclude user private JREs in the version search
    -? -help      print this help message
    -X            print help on non-standard options
    -ea[:<packagename>...|:<classname>]
    -enableassertions[:<packagename>...|:<classname>]
                  enable assertions
    -da[:<packagename>...|:<classname>]
    -disableassertions[:<packagename>...|:<classname>]
                  disable assertions
    -esa | -enablesystemassertions
                  enable system assertions
    -dsa | -disablesystemassertions
                  disable system assertions
    -agentlib:<libname>[=<options>]
                  load native agent library <libname>, e.g. -agentlib:hprof
                    see also, -agentlib:jdwp=help and -agentlib:hprof=help
    -agentpath:<pathname>[=<options>]
                  load native agent library by full pathname
    -javaagent:<jarpath>[=<options>]
                  load Java programming language agent, see java.lang.instrument

    -splash:<imagepath>
                  show splash screen with specified image

表示JDK安装成功。

 

4、用cd命令进入java文件所在目录，javac对Test.java文件经行编译，java命令执行Test文件:

 

    编译成功在Test.java所在文件夹下生成Test.class文件。