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I could not execute my java program by a command line, although the Eclipse’s “Run” menu executed it. While examining the problem, I happened to find that changing the name from HELLOWorld to HelloWorld fixed the problem for my particular case. Does really Java’s naming rule restrict such names?
The Java Language Specification states the requirements for a class name (which is an Identifier). To sum it up: it must begin with a letter or underscore, and the remainder may contain letters or digits.
Thus,
HELLOWorldis a valid classname, however, if your class ispublic, the filename and classname must match (you will receive a compilation error otherwise).