yum -y list java* 查看当前java的版本

[root@NB ok]# yum -y list java*

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Installed Packages

java-1.6.-openjdk.x86_64                :1.6.0.35-1.13.7.1.el6_6  @anaconda-CentOS-.x86_64/6.7

java-1.7.-openjdk.x86_64                :1.7.0.79-2.5.5.4.el6     @anaconda-CentOS-.x86_64/6.7

Available Packages

java-1.5.-gcj.x86_64                    1.5.0.0-29.1.el6           base

java-1.5.-gcj-devel.x86_64              1.5.0.0-29.1.el6           base

java-1.5.-gcj-javadoc.x86_64            1.5.0.0-29.1.el6           base

java-1.5.-gcj-src.x86_64                1.5.0.0-29.1.el6           base

java-1.6.-openjdk.x86_64                :1.6.0.40-1.13.12.6.el6_8 updates

java-1.6.-openjdk-demo.x86_64           :1.6.0.40-1.13.12.6.el6_8 updates

java-1.6.-openjdk-devel.x86_64          :1.6.0.40-1.13.12.6.el6_8 updates

java-1.6.-openjdk-javadoc.x86_64        :1.6.0.40-1.13.12.6.el6_8 updates

java-1.6.-openjdk-src.x86_64            :1.6.0.40-1.13.12.6.el6_8 updates

java-1.7.-openjdk.x86_64                :1.7.0.121-2.6.8.1.el6_8  updates

java-1.7.-openjdk-demo.x86_64           :1.7.0.121-2.6.8.1.el6_8  updates

java-1.7.-openjdk-devel.x86_64          :1.7.0.121-2.6.8.1.el6_8  updates

java-1.7.-openjdk-javadoc.noarch        :1.7.0.121-2.6.8.1.el6_8  updates

java-1.7.-openjdk-src.x86_64            :1.7.0.121-2.6.8.1.el6_8  updates

java-1.8.-openjdk.x86_64                :1.8.0.111-.b15.el6_8    updates

java-1.8.-openjdk-debug.x86_64          :1.8.0.111-.b15.el6_8    updates

java-1.8.-openjdk-demo.x86_64           :1.8.0.111-.b15.el6_8    updates

java-1.8.-openjdk-demo-debug.x86_64     :1.8.0.111-.b15.el6_8    updates

java-1.8.-openjdk-devel.x86_64          :1.8.0.111-.b15.el6_8    updates

java-1.8.-openjdk-devel-debug.x86_64    :1.8.0.111-.b15.el6_8    updates

java-1.8.-openjdk-headless.x86_64       :1.8.0.111-.b15.el6_8    updates

java-1.8.-openjdk-headless-debug.x86_64 :1.8.0.111-.b15.el6_8    updates

java-1.8.-openjdk-javadoc.noarch        :1.8.0.111-.b15.el6_8    updates

java-1.8.-openjdk-javadoc-debug.noarch  :1.8.0.111-.b15.el6_8    updates

java-1.8.-openjdk-src.x86_64            :1.8.0.111-.b15.el6_8    updates

java-1.8.-openjdk-src-debug.x86_64      :1.8.0.111-.b15.el6_8    updates

java_cup.x86_64                          :.10k-.el6              base

java_cup-javadoc.x86_64                  :.10k-.el6              base

java_cup-manual.x86_64                   :.10k-.el6              base

javacc.x86_64                            4.1-0.5.el6                base

javacc-demo.x86_64                       4.1-0.5.el6                base

javacc-manual.x86_64                     4.1-0.5.el6                base

javassist.noarch                         3.9.-.el6                base

javassist-javadoc.noarch                 3.9.-.el6                base