openSUSE自帶了OpenJDK，安裝Oracle JDK後，需要使用alternatives切換系統默認使用的JDK版本。
1）安裝JDK：
linuxidc@linux-linuxidc:~/下載> sudo zypper install jdk-8u66-linux-x64.rpm -y
...
/var/tmp/rpm-tmp.DfGrcZ: line 638: /usr/sbin/alternatives: No such file or directory
/var/tmp/rpm-tmp.DfGrcZ: line 650: /usr/sbin/alternatives: No such file or directory
warning: %post(jdk1.8.0_66-2000:1.8.0_66-fcs.x86_64) scriptlet failed, exit status 127
有如上的報錯，“/usr/sbin/alternatives”這個文件找不到。openSUSE相應的文件名是update-alternatives，嘗試做了軟連接，會報新的錯誤：
update-alternatives: error: alternative javaws can't be slave of java: it is a slave of javaplugin
update-alternatives: error: alternative javaws can't be slave of javac: it is a slave of javaplugin
warning: %post(jdk1.8.0_66-2000:1.8.0_66-fcs.x86_64) scriptlet failed, exit status 2
看來openSUSE和Oracle JDK不是很友好啊，需要手動完成後續的必要步驟（從網上找的，可能不是安裝腳本的全部後續操作）。
2）用alternatives聲明jdk版本並設為默認：
linuxidc@linux-linuxidc:~/下載> sudo /usr/sbin/update-alternatives --install "/usr/bin/java" "java" "/usr/java/jdk1.8.0_66/bin/java" 40
linuxidc@linux-linuxidc:~/下載> sudo /usr/sbin/update-alternatives --install "/usr/lib64/browser-plugins/javaplugin.so" "javaplugin" "/usr/java/jdk1.8.0_66/jre/lib/amd64/libnpjp2.so" 40
——其中紅色部分根據操作系統及指令集不同會有不同。
linuxidc@linux-linuxidc:~/下載> sudo /usr/sbin/update-alternatives --config java
There are 3 choices for the alternative java (providing /usr/bin/java).
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/lib64/jvm/jre-1.8.0-openjdk/bin/java 18040 auto mode
1 /usr/java/jdk1.8.0_66/bin/java 40 manual mode
2 /usr/lib64/jvm/jre-1.7.0-openjdk/bin/java 17147 manual mode
3 /usr/lib64/jvm/jre-1.8.0-openjdk/bin/java 18040 manual mode
Press enter to keep the current choice[*], or type selection number: 1
update-alternatives: using /usr/java/jdk1.8.0_66/bin/java to provide /usr/bin/java (java) in manual mode
linuxidc@linux-linuxidc:~/下載> sudo /usr/sbin/update-alternatives --config javaplugin
There are 3 choices for the alternative javaplugin (providing /usr/lib64/browser-plugins/javaplugin.so).
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/lib64/java-1_8_0-openjdk-plugin/lib/IcedTeaPlugin.so 18020 auto mode
1 /usr/java/jdk1.8.0_66/jre/lib/amd64/libnpjp2.so 40 manual mode
2 /usr/lib64/java-1_7_0-openjdk-plugin/lib/IcedTeaPlugin.so 17147 manual mode
3 /usr/lib64/java-1_8_0-openjdk-plugin/lib/IcedTeaPlugin.so 18020 manual mode
Press enter to keep the current choice[*], or type selection number: 1
update-alternatives: using /usr/java/jdk1.8.0_66/jre/lib/amd64/libnpjp2.so to provide /usr/lib64/browser-plugins/javaplugin.so (javaplugin) in manual mode
3）查看JDK版本：
linuxidc@linux-linuxidc:~/下載> java -version
java version "1.8.0_66"
4）修改JAVA_HOME:
但是此時JAVA_HOME尚不正確：
linuxidc@linux-linuxidc:~/下載> echo $JAVA_HOME
/usr/lib64/jvm/jre
修改/etc/profile文件，在文件尾追加：
export JAVA_HOME=/usr/java/jdk1.8.0_66
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH
退出，重新登陸後：
linuxidc@linux-linuxidc:~> echo $JAVA_HOME
/usr/java/jdk1.8.0_66
DONE！
Ubuntu 14.04安裝JDK1.8.0_25與配置環境變量 http://www.linuxidc.com/Linux/2015-01/112030.htm
CentOS 搭建JDK環境 http://www.linuxidc.com/Linux/2015-06/118879.htm
Ubuntu 14.04安裝JDK1.8.0_25與配置環境變量 http://www.linuxidc.com/Linux/2015-01/112030.htm
Ubuntu 14.04 LTS安裝Oracle JDK 1.8 http://www.linuxidc.com/Linux/2014-11/109216.htm
CentOS6.3安裝JDK和環境配置 http://www.linuxidc.com/Linux/2012-09/70780.htm
Ubuntu 14.04 安裝 JDK8 http://www.linuxidc.com/Linux/2014-09/106218.htm
Ubuntu下安裝JDK圖文解析 http://www.linuxidc.com/Linux/2014-09/107291.htm
更多SUSE相關信息見SUSE 專題頁面 http://www.linuxidc.com/topicnews.aspx?tid=3
