JAVA DOWNCAST BY DESIGN CODE

There are two ways in which the objects can be initialized while inheriting the properties of the parent and child. It is the mechanism in Java by which one class is allowed to inherit the features ( fields and methods) of another class. In Java, up-casting is permitted, while down-casting results in a build error. Downcasting is performed to access the methods and. We can only explicitly downcast an object.

SubClass subClass2 = (SubClass)superClass1 Inheritance is an important pillar of OOP (Object Oriented Programming). Downcasting is the process of casting superclass to subclass. You can, however, use instanceof keyword to do your downcasting.

JAVA DOWNCAST BY DESIGN CODE

Parent parent new ParentAddedMembes () ParentAddedMembes pm (ParentAddedMembes) parent The above code is valid. SubClass subClass1 = (SubClass)superClass2 My guess is that variable of type Parent is not holding a value that is a ParentAddedMembes. SuperClass superClass1 = new SuperClass() Look at this example to understand when downcasting works without any exception. Downcasting is legal in some scenarios where the actual object referred by the parent class is of sub class. Then why downcasting is permitted without any compiler error?. However, if you do downcasting, there will not be any compiler error. Downcasting is assigning parent class reference object to the sub class which is not allowed in Java. Upcasting is assigning the sub class reference object to the parent class which is allowed in Java.

Java downcast by design