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Downcasting In Java. Upcasting is assigning the sub class reference object to the parent class which is allowed in Java. Downcasting is assigning parent class reference object to the sub class which is not allowed in Java. However, if you do downcasting, there will not be any compiler error.
Upcasting and downcasting are important part of Java, which allow us to build complicated programs using simple syntax, and gives us great advantages, like Polymorphism or grouping different objects. Javapermits an object of a subclass type to be treated as an object of any superclass type. This is called upcasting.