Garbage collection is a two-step process, where the collector first has to analyse heap memory contents, identify the objects which are unreferenced and marking these memory areas. ("I am a generic shape, not sure what to draw") Shape shapes = Īrrays.stream(shapes).forEach(shape -> shape.draw()) Java resolves the draw method behaviour according to the instance type. The below code creates an instance of each class, stores it in an array of shapes and calls the method draw on each instance. These two classes inherit the class shape and override the method draw. The below code shows two classes Circle and Square. Method overriding is when a method of the parent class is reimplemented in the child class using the same name and method signature to reflect a difference in behaviour for the child class. What is method overriding? Provide an example Exception(String message, Throwable cause)Īn overloaded method is one which provides multiple signatures and thus can be invoked using a different number of parameters and/or parameter types.Overriding refers to the ability of a subclass to redefine the behaviour for a parents method. The second type of polymorphism is Runtime polymorphism which is also known as overriding. Overloading refers to the ability to provide more than one set of parameters for a class method. Compile-time polymorphism is also known as overloading. A developer may use Interfaces to enforce different behaviours since a class can implement multiple interfaces. Java supports single inheritance only and thus does not support multiple inheritance. Inheritance allows a developer to mark a class as a parent and embed the parent class’s behaviour and attributes as if these are part of the child class without the need to duplicate code. What is inheritance? Can you do multiple inheritance in Java? Encapsulation refers to having behaviour, data and data manipulation logic enclosed within the object.Ībstraction is the ability to hide implementation details from anyone who is making use of the object.
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