Centos 7.2 JDK8 安装

	Install Java SE Development Kit 8 (JDK8) and build Java Environment.
[1]	Download and install JDK 8. Make sure the latest version and source URL of JDK on Oracle download site.

[root@dlp ~]# curl -LO -H "Cookie: oraclelicense=accept-securebackup-cookie" \ "http://download.oracle.com/otn-pub/java/jdk/8u71-b15/jdk-8u71-linux-x64.rpm" [root@dlp ~]# rpm -Uvh jdk-8u71-linux-x64.rpm Preparing... ############################## [100%] 1:jdk1.8.0_71 ############################## [100%] Unpacking JAR files... rt.jar... jsse.jar... charsets.jar... tools.jar... localedata.jar... jfxrt.jar... [root@dlp ~]# vi /etc/profile # add follows to the end export JAVA_HOME=/usr/java/default export PATH=$PATH:$JAVA_HOME/bin export CLASSPATH=.:$JAVA_HOME/jre/lib:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jar [root@dlp ~]# source /etc/profile

[2]	If another version of JDK had been installed, change the default like follows.

[root@dlp ~]# alternatives --config java There are 2 programs which provide 'java'. Selection Command ----------------------------------------------- *+ 1 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64/jre/bin/java 2 /usr/java/jdk1.8.0_71/jre/bin/java # select the latest one Enter to keep the current selection[+], or type selection number: 2

[3]	Create a test program and make sure if it works normally.

[root@dlp ~]# vi day.java

import java.util.Calendar;

class day {
    public static void main(String[] args) {
        Calendar cal = Calendar.getInstance();
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH) + 1;
        int day = cal.get(Calendar.DATE);
        int hour = cal.get(Calendar.HOUR_OF_DAY);
        int minute = cal.get(Calendar.MINUTE);
        System.out.println(year + "/" + month + "/" + day + " " + hour + ":" + minute);
    }
}

[root@dlp ~]# javac day.java

   

# compile

[root@dlp ~]# java day