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WOW java HelloWorld works.
Do you know why it is like this? I was told that to run java files one must make a binary file which is readable by java virtual machine and then run the program. But in this case it seems to me I can run this program like an interpreted language.
It's the way Java organises binary files. If you're writing a more complex program, with several classes, you can organise the classes into groups, called packages, to help keep things more organised. A dot is used to separate package and class names, so what's happening when you run "java HelloWorld.class", is Java is looking for a class called "class", in a package called "HelloWorld". Which, of course, doesn't exist. By running "java HelloWorld", then Java will look for a class called "HelloWorld" in the default package, which is what you want.