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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.
In encapsulation the variables of a class will be hidden from other classes, and can be accessed only through the methods of their current class, therefore it is also known as data hiding. To achieve encapsulation in Java. Declare the variables of a class as private.elow given is an example that demonstrates how to achieve Encapsulation in Java: The public setXXX() and getXXX() methods are the access points of the instance variables of the EncapTest class.