hello:
    can you help me ?we all know  that we can use a class'object in main
method in java,but how can i use a class'object after designing a class
in ruby? i only know i can make an object and use it after having a
class,i can also use a class method in a class to get some result after
designing a class method.But why i can do that? i do not know the
reason? is there an only place like main method of java in which i can
use my classes? is there a  rule that can guide me to use my ruby class
correctly?
 thank you !
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