The dash (-) tells the java execution program to treat it's first
argument as a swtich, which it knows how to handle.
Without the dash, the java execution program thinks that its first
argument ("version") is the name of a class which it should try to
execute (but can't find).
On May 14, 2009, at 3:48 PM, Dave Filchak wrote:
Curious,
What is the difference between java -version and java version?
In the first case I get:
java -version
java version "1.6.0_13"
Java(TM) SE Runtime Environment (build 1.6.0_13-b03)
Java HotSpot(TM) 64-Bit Server VM (build 11.3-b02, mixed mode)
In the second, I get:
java version
Exception in thread "main" java.lang.NoClassDefFoundError: version
Caused by: java.lang.ClassNotFoundException: version
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: version. Program will exit.
Dave
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