Program runs in eclipse but in command line I need java -cp .

I thought I understood what the classpath variable was all about. I thought it was the directory where the java standard classes were, namely the bin directory of your Java directory. However I've been using Eclipse for the first time and the programs compile and run fine in Eclipse, but in my command line I need to do java -cp . [compiled class] to make it run. Can somebody explain why? Doesn't java normally look in the current directory for the executing classes?
Also I just checked out my CLASSPATH variable and I see C:\Program Files\Java\jre1.5.0_04\lib\ext\QTJava.zip which doesn't seem right to me. Can somebody explain what this is all about? I thought when you installed the Java SDK (JDK) it sets your classpath and everything.

I thought I understood what the classpath variable
was all about. I thought it was the directory where
the java standard classes were, namely the bin
directory of your Java directory.There is nothing correct about this statement. The classpath defines where your classes, packages and JARs are. /bin should be in PATH, and the J2SE standard classes don't need to be referenced in any variable.
However I've been
using Eclipse for the first time and the programs
compile and run fine in Eclipse, but in my command
line I need to do java -cp . [compiled class] to make
it run. Can somebody explain why?Because the Eclipse project defines a classpath of its own (see Proprties-> Build Path) and doesn't give a damn about any system variable.
Doesn't java
normally look in the current directory for the
executing classes?No. It looks in the classpath, nowhere else.
Also I just checked out my CLASSPATH variable and I
see C:\Program
Files\Java\jre1.5.0_04\lib\ext\QTJava.zip which
doesn't seem right to me. Can somebody explain what
this is all about? Another superfluous setting. Libs in /lib/ext are automatically in the classpath.
I thought when you installed the
Java SDK (JDK) it sets your classpath and everything.How would it know where your classes are?

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