Friday Java Quiz: Know Your JDK Tools

The Sun JDK 6 on my Debian 4.0 system contains the following executables in its bin directory:

[weiqi@gao: /usr/lib/jvm/java-6-sun-1.6.0.06/bin] $ ls
amd64         java      jhat        jstat         rmic         unpack200
appletviewer  javac     jinfo       jstatd        rmid         wsgen
apt           javadoc   jmap        keytool       rmiregistry  wsimport
extcheck      javah     jps         native2ascii  schemagen    xjc
idlj          javap     jrunscript  orbd          serialver
jar           jconsole  jsadebugd   pack200       servertool
jarsigner     jdb       jstack      policytool    tnameserv

Some of these tools, such as javac, java and javap I use every day. Others, such as appletviewer and jdb, not so often any more. There are some I never used.

Today's quiz has multiple questions:

Q: for (String exe : aboveList) {
        What does exe do?
        Have you ever had any occasions to use it?
    }