A summary of why Eclipse is running the previous program

Run eclipse sometimes does not run the class that you just wrote, it always runs another previous class, deletes the previous class and doesn't run anything. After looking for a long time, I finally found that the class I just wrote had no main () or error. This is related to the Java characteristics, the program is always running the main () method as a start, so now that the class does not define main (), it can be regarded as a functional class, the entrance in the original class, of course, from the original program to start running. The improvement is to look for the next write class main () there is no error, or the entire program is not mistaken. It's OK to run after the mend.