Install Java with yum on Centos:
$ yum install java-1.7.0-openjdk java-1.7.0-openjdk-devel
Install Java with yum on Debian:
su -
echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" | tee /etc/apt/sources.list.d/webupd8team-java.list
echo "deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" | tee -a /etc/apt/sources.list.d/webupd8team-java.list
apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys EEA14886
apt-get update
apt-get install oracle-java7-installer
exitOR
#Download Java:
mkdir -p /usr/java/ cd /usr/java/ wget http://download.huangshiyang.com/jdk-7u67-linux-x64.gz tar -xzvf jdk-7u67-linux-x64.gz wget http://download.huangshiyang.com/jdk-8u111-linux-x64.tar.gz tar -xzvf jdk-8u111-linux-x64.tar.gz
#Export JAVA_HOME & PATH:
vi /etc/profile
#Add the following lines at the end:
export JAVA_HOME=/usr/java/jdk1.7.0_67 export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar export PATH=$PATH:$JAVA_HOME/bin
#Enable config:
source /etc/profile
#Test
java -version java javac jps
一般情况下，我们都要将linux自带的OPENJDK卸载掉，然后安装SUN的JDK。
首先查看Linux自带的JDK是否已安装。
输入如下命令，查看已经安装的JAVA版本信息。
- java -version
输入如下命令，查看JDK的信息。
- rpm -qa|grep java
如下图所示。
卸载已经安装的JAVA，如下图所示。
卸载完成，如下图所示。
卸载另外一个，如下图所示。
卸载完成，如下图所示。
第二步，安装SUN的JDK。
官网：http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
在/usr下建立一个java目录，以备将java程序安装在此目录下，输入如下命令：
- mkdir /usr/java
把下载好的安装文件拷贝到原系统的共享文件夹share中，通过命令查看文件：
- cd /mnt/share
- ls -a
将文件复制到/usr/java目录下，输入如下命令：
- cp *.gz /usr/java
查看/usr/java目录，输入如下命令：
- cd /usr/java
- ls -a
如下图所示。
解压文件，输入如下命令：
- tar -xzvf jdk-7u13-linux-x64.gz
解压后，在/usr/java目录下就会生成一个新的目录jdk1.7.0_13，该目录下存放的是解压后的文件。
为了以后设置方便，我们该生成的目录jdk1.7.0_13改名为jdk，输入如下命令：
- mv jdk1.7.0_13 jdk
如下图所示。
或者，如果你下载的文件是rpm 格式的话，在上面用tar命令处，替换为下列命令来安装，其他步骤不变。
- rpm -ivh jdk-7u13-linux-x64.rpm
最后进行环境变量的设置。
输入如下命令，进入配置文件。
- vi /etc/profile
如下图所示。
进入配置文件，如下图所示，将红色框中的第一行删除，换为下面三行配置信息。
让环境变量生效。
执行配置文件，令其立刻生效，输入如下命令：
- source /etc/profile
验证是否安装成功，输入如下命令：
- Java -version
如下图所示，表示安装成功！
运行第一个JAVA程序。
新建一个HelloWorld.java文件，如下图所示。
编辑文件，如下图所示。
保存文件，编译并运行，如下图所示。
运行成功！
如果下载的是bin结尾的java文件，可以参考：http://blog.csdn.net/cezeffort/article/details/7605863
java下载地址：http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
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