centos7 install JDK environment

1. Download and install jdk

　　View jdk version using yum

yum Search the Java | grep -i --color JDK JDK # View the list of packages

2. Use the yum install

yum  install java- 1.8 . 0 -openjdk * # install all Java1. 8 .0 all Java packages

3. Set Environment Variables

LS -l / usr / lib / JVM default installation path #jdk

Editing environment variable

vi / etc / Profile # centos7 system environment variable position by adding the following at the end face saving exit

#set java environment
JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.181-7.b13.el7.x86_64
PATH=$PATH:$JAVA_HOME/bin
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME  CLASSPATH  PATH

source  /etc/profile  #生效环境配置

4. 测试

java -version