[root@BlueSky tv2.0]# javaUsage: gij [OPTION] ... CLASS [ARGS] ... to invoke CLASS.main, or gij -jar [OPTION] ... JARFILE [ARGS] ... to execute a jar fileTry `gij --help' for more information.于是：
[root@BlueSky tv2.0]# which java/usr/bin/java[root@BlueSky software]# ls /usr/bin/java -llrwxrwxrwx 1 root root 22 01-15 21:23 /usr/bin/java -> /etc/alternatives/java[root@BlueSky software]# ll /etc/alternatives/javalrwxrwxrwx 1 root root 35 05-10 13:48 /etc/alternatives/java -> /usr/lib/jvm/jre-1.4.2-gcj/bin/java查看alternatives的帮助；
[root@BlueSky software]# alternatives --help替换选择(alternatives)的版本 1.3.30 - 版权 (C) 1997-2000 Red Hat, Inc.在 GNU 公共许可的条款下，本软件可以被自由发行。用法：alternatives --install <link> <name> <path> <priority> [--initscript <service>] [--slave <link> <name> <path>]* alternatives --remove <name> <path> alternatives --auto <name> alternatives --config <name> alternatives --display <name> alternatives --set <name> <path>公用选项：--verbose --test --help --usage --version --altdir <directory> --admindir <directory>下面先安装jre1.5.0_09，此版本可以到sun的公司网站上下得；
[root@BlueSky software]# rpm -ivh jre-1_5_0_09-linux-i586.rpm Preparing... ########################################### [100%] 1:jre ########################################### [100%][root@BlueSky software]# /usr/java/jre1.5.0_09/bin/javaUsage: java [-options] class [args...] (to execute a class) or java [-options] -jar jarfile [args...] (to execute a jar file)where options include: -d32 use a 32-bit data model if available -d64 use a 64-bit data model if available -client to select the "client" VM -server to select the "server" VM -hotspot is a synonym for the "client" VM [deprecated] The default VM is client. -cp <class search path of directories and zip/jar files> -classpath <class search path of directories and zip/jar files> A : separated list of directories, JAR archives, and ZIP archives to search for class files. -D<name>=<value> set a system property -verbose[:class|gc|jni] enable verbose output -version print product version and exit -version:<value> require the specified version to run -showversion print product version and continue -jre-restrict-search | -jre-no-restrict-search include/exclude user private JREs in the version search -? -help print this help message -X print help on non-standard options -ea[:<packagename>...|:<classname>] -enableassertions[:<packagename>...|:<classname>] enable assertions -da[:<packagename>...|:<classname>] -disableassertions[:<packagename>...|:<classname>] disable assertions -esa | -enablesystemassertions enable system assertions -dsa | -disablesystemassertions disable system assertions -agentlib:<libname>[=<options>] load native agent library <libname>, e.g. -agentlib:hprof see also, -agentlib:jdwp=help and -agentlib:hprof=help -agentpath:<pathname>[=<options>] load native agent library by full pathname -javaagent:<jarpath>[=<options>] load Java programming language agent, see java.lang.instrument接着，使用alternatives工具增加这个版本；
[root@BlueSky software]# alternatives --install /usr/bin/java java /usr/java/jre1.5.0_09/bin/java 300[root@BlueSky software]# alternatives --config java共有 2 个程序提供“java”。 选择 命令-----------------------------------------------* 1 /usr/lib/jvm/jre-1.4.2-gcj/bin/java 2 /usr/java/jre1.5.0_09/bin/java按 Enter 来保存当前选择[+]，或键入选择号码：2[root@BlueSky software]# javaUsage: java [-options] class [args...] (to execute a class) or java [-options] -jar jarfile [args...] (to execute a jar file)where options include: -d32 use a 32-bit data model if available -d64 use a 64-bit data model if available -client to select the "client" VM -server to select the "server" VM -hotspot is a synonym for the "client" VM [deprecated] The default VM is client. -cp <class search path of directories and zip/jar files> -classpath <class search path of directories and zip/jar files> A : separated list of directories, JAR archives, and ZIP archives to search for class files. -D<name>=<value> set a system property -verbose[:class|gc|jni] enable verbose output -version print product version and exit -version:<value> require the specified version to run -showversion print product version and continue -jre-restrict-search | -jre-no-restrict-search include/exclude user private JREs in the version search -? -help print this help message -X print help on non-standard options -ea[:<packagename>...|:<classname>] -enableassertions[:<packagename>...|:<classname>] enable assertions -da[:<packagename>...|:<classname>] -disableassertions[:<packagename>...|:<classname>] disable assertions -esa | -enablesystemassertions enable system assertions -dsa | -disablesystemassertions disable system assertions -agentlib:<libname>[=<options>] load native agent library <libname>, e.g. -agentlib:hprof see also, -agentlib:jdwp=help and -agentlib:hprof=help -agentpath:<pathname>[=<options>] load native agent library by full pathname -javaagent:<jarpath>[=<options>] load Java programming language agent, see java.lang.instrument查看效果：
[root@BlueSky software]# alternatives --display javajava - 状态是手工。 链接目前指向 /usr/java/jre1.5.0_09/bin/java/usr/lib/jvm/jre-1.4.2-gcj/bin/java - 优先度 1420 从 keytool：/usr/lib/jvm/jre-1.4.2-gcj/bin/keytool 从 rmiregistry：/usr/lib/jvm/jre-1.4.2-gcj/bin/rmiregistry 从 jre_exports：/usr/lib/jvm-exports/jre-1.4.2-gcj 从 jre：/usr/lib/jvm/jre-1.4.2-gcj/usr/java/jre1.5.0_09/bin/java - 优先度 300 从 keytool：(null) 从 rmiregistry：(null) 从 jre_exports：(null) 从 jre：(null)当前“最佳”版本是 /usr/lib/jvm/jre-1.4.2-gcj/bin/java。Trackback: http://tb.blog.youkuaiyun.com/TrackBack.aspx?PostId=1631959
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