If subclass override any method by changing the return type of super class method, then the return type of overriden method must be subtype of return type declared in original method inside the super class. Since Java 5, it is possible to override a method by changing its return type. In the below example, to the child class method, we set protected which is restricted than pubic specified in parent class.Ĭannot reduce the visibility of the inherited method from Animal. Java does not allows method overriding if child class has more restricted access modifier than parent class. NOTE: Static methods cannot be overridden because, a static method is bounded with class where as instance method is bounded with object.Įxample: Access modifier is more restrictive in child class For method overriding, the method must have same name and same type signature in both parent and child class. ("Dog like to eat meat") Īs you can see here Dog class gives it own implementation of eat() method. Public void eat() //eat() method overridden by Dog class. Example of Method Overridingīelow we have simple code example with one parent class and one child class wherein the child class will override the method provided by the parent class. There must be an IS-A relationship between classes (inheritance). Private, final and static methods cannot be overridden.Ĥ. Access modifier of child method must not restrictive than parent class method.ģ. Method name must be same for both parent and child classes.Ģ. The key benefit of overriding is the ability to define method that's specific to a particular subclass type. Method overriding is also referred to as runtime polymorphism because calling method is decided by JVM during runtime. In overriding, method of both class must have same name and equal number of parameters. In other words, It is performed between two classes using inheritance relation. Method overriding performs only if two classes have is-a relationship. Method overriding is a process of overriding base class method by derived class method with more specific definition. Connecting to Access using Type-1 Driver.Method Overriding with Exception Handling.Difference between Classes And Interface.
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