CentOS如何卸载系统的OpenJDK
<p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";">安装好的CentOS会自带OpenJdk,用命令 Java -version ，会有下面的信息：</p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";">
java version "1.6.0"</p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";">
OpenJDK Runtime Environment (build 1.6.0-b09)</p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";">
OpenJDK 64-Bit Server VM (build 1.6.0-b09, mixed mode)</p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";">
最好还是先卸载掉openjdk,在安装sun公司的jdk.</p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";">
先查看 rpm -qa | grep java</p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";"><strong>显示如下信息：</strong></p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";">
java-1.4.2-gcj-compat-1.4.2.0-40jpp.115</p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";">
java-1.6.0-openjdk-1.6.0.0-1.7.b09.el5</p><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";"><strong>卸载：</strong></p><pre class="brush:bash;toolbar:false">rpm -e --nodeps java-1.4.2-gcj-compat-1.4.2.0-40jpp.115</pre><pre class="brush:bash;toolbar:false">rpm -e --nodeps java-1.6.0-openjdk-1.6.0.0-1.7.b09.el5</pre><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";"><strong>还有一些其他的命令</strong></p><pre class="brush:bash;toolbar:false">rpm -qa | grep gcj</pre><pre class="brush:bash;toolbar:false">rpm -qa | grep jdk</pre><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";">
如果出现找不到openjdk source的话，那么还可以这样卸载</p><pre class="brush:bash;toolbar:false">yum -y remove java java-1.4.2-gcj-compat-1.4.2.0-40jpp.115</pre><pre class="brush:bash;toolbar:false">yum -y remove java java-1.6.0-openjdk-1.6.0.0-1.7.b09.el5</pre><p style="margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";"><br/></p>
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