操作步骤:

编译运行环境的搭建

fedora下默认安装为GNU公司的JDK,如下所示
$java -version
java version "1.7.0_25"
OpenJDK Runtime Environment (fedora-2.3.10.4.fc19-i386)
OpenJDK Server VM (build 23.7-b01, mixed mode)

而我们需要使用SUN公司的Java(这真的不是在广告),下载地址:http://www.oracle.com/technetwork/java/javase/downloads/index.html

下载完成以后配置如下: (比如我的jdk的路径是:~/jdk1.8.0_71/)

$ sudo alternatives --install /usr/bin/java java ~/jdk1.8.0_71/bin/java 500
$ sudo alternatives --install /usr/bin/javac javac ~/jdk1.8.0_71/bin/javac 500
$ sudo alternatives --config java

There are 2 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*+ 1           /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.71-1.b15.fc23.x86_64/jre/bin/java
   2           /home/zyoohv/jdk1.8.0_71/bin/java

Enter to keep the current selection[+], or type selection number: 2 

完成后输入以下命令查看配置是否成功:

$ java -version
java version "1.8.0_71"
Java(TM) SE Runtime Environment (build 1.8.0_71-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.71-b15, mixed mode)

Java程序编辑、编译与运行

建立一个名字为HelloWorld.java的文件,并在其中输入如下代码:
	public class HelloWorld{
		public static void main(String[] args){
			System.out.println("hello world !");
		}	
	}

在此文件目录下输入以下命令:

$ ls
HelloWorld.java
$ javac HelloWorld.java 
$ ls
HelloWorld.class  HelloWorld.java
$ java HelloWorld 
hello world !

即编译运行成功!