Fedora20 comes with OpenJDK, So if you install the official JDK, you must first Delete OpenJDK. The steps are as follows: 1: rpm-qa | grepjdk to view the current jdk status. 2: yum-yremovejavajava-1.7.0-openjdk * uninstall openjdk, which may uninstall some additional software due to dependency. 3: Download the official JDK from oracle.gz. 4
Fedora 20 comes with OpenJDK, So if you install the official JDK, you must first Delete OpenJDK as follows:
1: run the rpm-qa | grep jdk command to check the current jdk status.
2: yum-y remove java java-1.7.0-openjdk * uninstall openjdk, which may uninstall some additional software due to dependency.
3: Download the official JDK from oracle.gz.
4: Decompress the jdk installation package tar-zxvf jdk-7u51-linux-x64.tar.gz to copy to your own software folder, my software is generally put under opt, so mv jdk1.7.0 _ 51 // opt/
5: configure the environment variable vi/etc/profile and enter the following content in the last row.
Export JAVA_HOME =/opt/jdk1.7.0 _ 51
Export CLASSPATH = $ CLASSPATH: $ JAVA_HOME/lib: $ JAVA_HOME/jre/lib
Export PATH = $ JAVA_HOME/bin: $ JAVA_HOME/jre/bin: $ PATH: $ HOME/bin
6: make the environment variable take effect source/etc/profile
7. Enter java or java-version.
For more information about Fedora, see Fedora topics page http://www.linuxidc.com/topicnews.aspx? Tid = 5