centos7安装jdk8

1. 首先下载rpm包

   

[root@localhost java]# curl -L "http://download.oracle.com/otn-pub/java/jdk/8u144-b01/090f390dda5b47b9b721c7dfaa008135/jdk-8u144-linux-x64.rpm" -H "Cookie: oraclelicense=accept-securebackup-cookie" -H "Connection: keep-alive" -O

2. 安装jdk

[root@localhost java]# rpm -i jdk-8u144-linux-x64.rpm

3. 检验是否安装成功,如果出现下面的命令选项说明安装成功

[root@localhost java]$ javac
Usage: javac  
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           Specify where to find user class files and annotation processors
  -cp                  Specify where to find user class files and annotation processors
  -sourcepath          Specify where to find input source files
  -bootclasspath       Override location of bootstrap class files
  -extdirs             Override location of installed extensions
  -endorseddirs        Override location of endorsed standards path
  -proc:{none,only}          Control whether annotation processing and/or compilation is done.
  -processor [,,...] Names of the annotation processors to run; bypasses default discovery process
  -processorpath       Specify where to find annotation processors
  -parameters                Generate metadata for reflection on method parameters
  -d              Specify where to place generated class files
  -s              Specify where to place generated source files
  -h              Specify where to place generated native header files
  -implicit:{none,class}     Specify whether or not to generate class files for implicitly referenced files
  -encoding        Specify character encoding used by source files
  -source           Provide source compatibility with specified release
  -target           Generate class files for specific VM version
  -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                   Pass  directly to the runtime system
  -Werror                    Terminate compilation if warnings occur
  @                Read options and filenames from file

4. 编写hello world

class Hello{
  public static void main(String[] args){
    System.out.println("hello world!");
  }
}

[root@localhost java]$ javac Hello.java
[root@localhost java]$ java Hello
hello world!