Fedora 安装jdk
<span style="font-family: times new roman, times; font-size: 16px">Fedora自带openjdk，所以如果安装oracle的jdk的话要先删除openjdk，步骤如下：</span><div><span style="font-family: times new roman, times; font-size: 16px">1：rpm -qa | grep jdk 查看当前的jdk情况。 </span></div>
<div><span style="font-family: times new roman, times; font-size: 16px">2：sudo dnf remove java java-1.8.0-openjdk* ，或者sudo rpm -e --nodeps java-1***换成你自己的openjdk版本）卸载openjdk，这个过程中因为依赖原因可能会卸载一些额外的软件。 用java -version 查看是否已卸载。</span></div>
<div><span style="font-family: times new roman, times; font-size: 16px">3: 去官网java.sun.com下载rpm</span></div>
<div><span style="font-family: times new roman, times; font-size: 16px">4: 安装: sudo rpm -ivh jdk-8u25-linux-x64.rpm</span></div>
<div><span style="font-family: times new roman, times; font-size: 16px"> JDK默认安装在/usr/java中。</span></div>
<div><span style="font-family: times new roman, times; font-size: 16px">5： vi /etc/profile</span><br><span style="font-family: times new roman, times; font-size: 16px">向文件里面追加以下内容：</span><br><span style="font-family: times new roman, times; font-size: 16px"> JAVA_HOME=/usr/java/jdk1.8.0_25</span><br><span style="font-family: times new roman, times; font-size: 16px"> JRE_HOME=/usr/java/jdk1.8.0_25/jre</span><br><span style="font-family: times new roman, times; font-size: 16px"> PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin</span><br><span style="font-family: times new roman, times; font-size: 16px"> CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib</span><br><span style="font-family: times new roman, times; font-size: 16px"> export JAVA_HOME JRE_HOME PATH CLASSPATH</span></div>
<div><span style="font-family: times new roman, times; font-size: 16px">6：验证：java -version</span></div><br><br>
来源：https://www.cnblogs.com/liujingli1986/p/16724910.html
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