class - Multiple classes in Eclipse but can only run up to 3 -

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just started eclipse sdk , trying create simple hello world examples. have created total of 4 classes in 1 project in eclipse, can run first three. how run/debug classes beyond first 3 or there limit number of classes can run program?

keep in mind can run classes main method.

the method signature needs exactly

 public static void main(string[] argv)

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