'Java Instantiation Syntax [duplicate]

I am currently learning Java as a past time, and I am troubling in absorbing this instantiation syntax. I know that if a Main class is created, I can create an object by using this

Main obj = new Main();

But in further lectures (specifically inheritance and polymorphism), they are creating objects as

Parentclass object = new Subclass();

I've tried using

Subclass object = new Subclass();

and have the same output.

Can you please tell me the difference about these two?

javaclassobjectoopinstantiation


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