linux 安装 java

yum search java | grep -i --color JDK

yum install java-1.7.0-openjdk java-1.7.0-openjdk-devel

ls -l /usr/lib/jvm/

export JAVA_HOME=/usr/lib/jvm/jre-1.7.0-openjdk.x86_64

 Sample code:

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World! This is a test code by nixCraft!");
    }
}

 执行：

javac HelloWorld.java
java HelloWorld

 执行jar 

java -jar /path/to/my/java/app.jar arg1 arg2

 环境变量：

#JAVA_HOME="/usr/lib/jvm/jre-1.6.0-openjdk.x86_64"
#JRE_HOME="/usr/lib/jvm/jre-1.6.0"
JAVA_HOME="/usr/lib/jvm/jre-1.7.0-openjdk-1.7.0.171-2.6.13.0.el7_4.x86_64"
JRE_HOME="/usr/lib/jvm/jre-1.7.0-openjdk"
CLASSPATH=.:$JAVA_HOME/lib/:${JRE_HOME}/lib
PATH=$JAVA_HOME/bin:$PATH
PATH=$PATH:$HOME/bin
export PATH