相关疑难解决方法(0)

新Java程序员在尝试运行Java程序时经常会遇到这些消息.

Error: Main method not found in class MyClass, please define the main method as:
   public static void main(String[] args)
or a JavaFX application class must extend javafx.application.Application

Error: Main method is not static in class MyClass, please define the main method as:
   public static void main(String[] args)

Error: Main method must return a value of type void in class MyClass, please
define the main method as:
   public static void main(String[] args)

java.lang.NoSuchMethodError: main
Exception in thread "main"

这是什么意思,什么可以导致它,以及应该怎么做才能解决它？