终端在启动Java时自动注销

Question

I just downloaded java onto my Macbook pro (mid 2012). When I click java to start, the terminal window opened but it seems to be automatically logged out. Could anyone help me out? What possibly cause this? I checked around on internet but no luck so far. I need Java to run Clojure.

Message on the terminal is below

Last login: Tue Jun  7 23:12:35 on ttys001
S-no-MBP:~ sssss$ /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java ; exit;
Usage: 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
    -server   to select the "server" VM
                  The default VM is server,
                  because you are running on a server-class machine.


    -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>
                  Warning: this feature is deprecated and will be removed
                  in a future release.
                  require the specified version to run
    -showversion  print product version and continue
    -jre-restrict-search | -no-jre-restrict-search
                  Warning: this feature is deprecated and will be removed
                  in a future release.
                  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 with specified granularity
    -da[:<packagename>...|:<classname>]
    -disableassertions[:<packagename>...|:<classname>]
                  disable assertions with specified granularity
    -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
    -splash:<imagepath>
                  show splash screen with specified image
See http://www.oracle.com/technetwork/java/javase/documentation/index.html for more details.
logout
Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.

Answer 1

java ; exit;

You're telling it to exit after running java. So it does. I suggest you familiarize yourself with the shell, not just java.

Answer 2

The exit; at the end of your first line is logging you out of your terminal session. Here are the cojure install docs for is: https://gist.github.com/rakhmad/2407109

Answer 3

Hang on -- you're clicking the Java binary using the finder? Do I understand you correctly?

That's not how Java works. It's a command line tool, not a graphical program. The help it's giving you is how you're supposed to call it. Understanding this is non-trivial. If you don't know how to use the terminal window and command line, you're going to be decidedly unhappy.

But here's something I just did from Terminal:

$ cat Hello.java
    public class Hello {
        public static void main(String[] args) {
            System.out.printf("Hello, World!\n");
        }
    }
$ javac Hello.java
$ java Hello
Hello, World!

I use a $ as my command prompt, so each line that begins with a $ is a command in the terminal window. So I cat'd the program (printed it out) -- it's 5 simple lines. I then used javac to compile it. I then used the java command to run it.

Maybe I misunderstood what you're doing, though.

Answer 4

Thanks guys! I did a couple thing. I changed my user as administer privilege and down load "Java for OS X 2015-001 https://support.apple.com/kb/DL1572?locale=en_US

It sorted all out :):) thanks!