Linux | Will JDK be played under CentOS7? you sure?

How to build a Java environment under Linux

Software Environment

Virtual machine: VMware Workstation

System: Linux: CentOS-7-x86_64

tool:

Installation tool: SSH client

Construction steps

1 : Query the current system version

cat  /proc/version

2 : First confirm whether the current system already has a java environment

java -version

3 ：Check if the JDK installation package exists in the current system

rpm -qa | grep java

4 : If not, enter the /opt directory, create a new folder java7, and then enter the java7 folder

cd /opt
mkdir java7
cd java7

5 : Download jdk7 online in the java7 directory

wget http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.tar.gz

6 : Unzip the current file to the folder

tar -zvxf jdk-7u79-linux-x64.tar.gz

7 : Configure environment variables

vi ~/.bash_profile

Enter the following:
export JAVA_HOME=/opt/java7/jdk1.7.0_79
export CLASSPATH=$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export PATH=$PATH:$JAVA_HOME/bin

8 : Make the configuration file effective

source ~/.bash_profile 

9 : View the JDK version after installation

java -version