通过update-alternatives --config java命令我们可以修改所选用的jvm的版本。
今天我下载了一个jdk1.6.0的.bin格式的安装文件， 运行后他就是在当前目录下创建了一个jdk的根目录。我刚开始以为需要把这个目录拷贝到/usr/lib/jvm下面就可以在jvm选项里面出现这个选项， 可是不是这样的。
通过ls -a /usr/lib/jvm命令我发现对于现有的能够在jvm选项里面出现的jvm版本都有一个.jinfo的文件，比如对于jdk1.5.0的就有下面这个相应内容的.jinfo文件：
代码： 全选
name=java-1.5.0-sun-1.5.0.06
alias=java-1.5.0-sun
priority=53
section=non-free
jre ControlPanel /usr/lib/jvm/java-1.5.0-sun/jre/bin/ControlPanel
jre java /usr/lib/jvm/java-1.5.0-sun/jre/bin/java
jre java_vm /usr/lib/jvm/java-1.5.0-sun/jre/bin/java_vm
jre javaws /usr/lib/jvm/java-1.5.0-sun/jre/bin/javaws
jre keytool /usr/lib/jvm/java-1.5.0-sun/jre/bin/keytool
jre pack200 /usr/lib/jvm/java-1.5.0-sun/jre/bin/pack200
jre policytool /usr/lib/jvm/java-1.5.0-sun/jre/bin/policytool
jre rmid /usr/lib/jvm/java-1.5.0-sun/jre/bin/rmid
jre rmiregistry /usr/lib/jvm/java-1.5.0-sun/jre/bin/rmiregistry
jre unpack200 /usr/lib/jvm/java-1.5.0-sun/jre/bin/unpack200
jdk HtmlConverter /usr/lib/jvm/java-1.5.0-sun/bin/HtmlConverter
jdk appletviewer /usr/lib/jvm/java-1.5.0-sun/bin/appletviewer
jdk apt /usr/lib/jvm/java-1.5.0-sun/bin/apt
jdk extcheck /usr/lib/jvm/java-1.5.0-sun/bin/extcheck
jdk idlj /usr/lib/jvm/java-1.5.0-sun/bin/idlj
jdk jar /usr/lib/jvm/java-1.5.0-sun/bin/jar
jdk jarsigner /usr/lib/jvm/java-1.5.0-sun/bin/jarsigner
jdk java-rmi.cgi /usr/lib/jvm/java-1.5.0-sun/bin/java-rmi.cgi
jdk javac /usr/lib/jvm/java-1.5.0-sun/bin/javac
jdk javadoc /usr/lib/jvm/java-1.5.0-sun/bin/javadoc
jdk javah /usr/lib/jvm/java-1.5.0-sun/bin/javah
jdk javap /usr/lib/jvm/java-1.5.0-sun/bin/javap
jdk jconsole /usr/lib/jvm/java-1.5.0-sun/bin/jconsole
jdk jdb /usr/lib/jvm/java-1.5.0-sun/bin/jdb
jdk jinfo /usr/lib/jvm/java-1.5.0-sun/bin/jinfo
jdk jmap /usr/lib/jvm/java-1.5.0-sun/bin/jmap
jdk jps /usr/lib/jvm/java-1.5.0-sun/bin/jps
jdk jsadebugd /usr/lib/jvm/java-1.5.0-sun/bin/jsadebugd
jdk jstack /usr/lib/jvm/java-1.5.0-sun/bin/jstack
jdk jstat /usr/lib/jvm/java-1.5.0-sun/bin/jstat
jdk jstatd /usr/lib/jvm/java-1.5.0-sun/bin/jstatd
jdk native2ascii /usr/lib/jvm/java-1.5.0-sun/bin/native2ascii
jdk rmic /usr/lib/jvm/java-1.5.0-sun/bin/rmic
jdk serialver /usr/lib/jvm/java-1.5.0-sun/bin/serialver
plugin mozilla-javaplugin.so /usr/lib/jvm/java-1.5.0-sun/jre/plugin/i386/ns7/libjavaplugin_oji.so
plugin firefox-javaplugin.so /usr/lib/jvm/java-1.5.0-sun/jre/plugin/i386/ns7/libjavaplugin_oji.so
plugin mozilla-snapshot-javaplugin.so /usr/lib/jvm/java-1.5.0-sun/jre/plugin/i386/ns7/libjavaplugin_oji.so谢谢大家！
