Could not find or load main class

Question

I have Windows 7, installed jdk1.7.0 and its supporting jre7.
My problem is compilation part works perfectly, but while running the Java program I get this error saying:

Answer 1

javac should know where to search for classes. Try this:

javac -cp . p1.java

You shouldn't need to specify classpath. Are you sure the file p1.java exists?