Question

Is it possible to have the main method accept an argument other than a string array? For example, can we have a method like main(Animals[]args){/*code*/}? If not, then why?

Answer 1

No – the entry point is always the method with the header public static void main(String[] args) (i.e. the JVM invokes this particular method). You can certainly define a method

public static void main(Animals[] args) {...}

but it would not be executed directly upon running the program.

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EDIT: The reason the main method specifically has a string-array argument is because this array will contain the command-line arguments when the program is run. Intuitively, these should be strings (and certainly not Animals, for example).