FAQ: Java How To Override A Method?

How do you override a method in Java?

Invoking overridden method from sub-class: We can call parent class method in overriding method using super keyword. Overriding and constructor: We can not override constructor as parent and child class can never have constructor with same name(Constructor name must always be same as Class name).

How do you override an existing method?

Rules for method overriding:

  1. In java, a method can only be written in Subclass, not in same class.
  2. The argument list should be exactly the same as that of the overridden method.
  3. The return type should be the same or a subtype of the return type declared in the original overridden method in the super class.

Is method overriding possible in Java?

Can we override java main method? No, because the main is a static method.

How do you override a void method?

You can only change the return type to a subclass of the original return type. All answers are correct from a technical point of view because Void is a class in Java that no other class can extend and when methods are overridden the return-type has to be a sub-type of the original type (parentReturnType.

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Why is @override used in Java?

@Override @Override annotation informs the compiler that the element is meant to override an element declared in a superclass. Overriding methods will be discussed in Interfaces and Inheritance. While it is not required to use this annotation when overriding a method, it helps to prevent errors.

Can we override private method in Java?

1) In Java, inner Class is allowed to access private data members of outer class. This behavior is same as C++ (See this). 2) In Java, methods declared as private can never be overridden, they are in-fact bounded during compile time. 5

Can we override static method?

Static methods cannot be overridden because they are not dispatched on the object instance at runtime. The compiler decides which method gets called. Static methods can be overloaded (meaning that you can have the same method name for several methods as long as they have different parameter types).

Why we Cannot override static method?

Overloading is the mechanism of binding the method call with the method body dynamically based on the parameters passed to the method call. Static methods are bonded at compile time using static binding. Therefore, we cannot override static methods in Java.

Which method Cannot be overridden?

A method declared final cannot be overridden. A method declared static cannot be overridden but can be re-declared. If a method cannot be inherited, then it cannot be overridden. A subclass within the same package as the instance’s superclass can override any superclass method that is not declared private or final.

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Can constructor be overridden?

Constructors are not normal methods and they cannot be “overridden”. Saying that a constructor can be overridden would imply that a superclass constructor would be visible and could be called to create an instance of a subclass.

Why method overriding is used?

Method Overriding is a feature that allows us to redefine the method in the subclass or derived class which is already defined in its parent class or superclass. In any object-oriented programming language, we can implement Method Overriding only when two classes have ‘Is-a’ relationship of inheritance between them.

Why is method overloading useful?

Method overloading increases the readability of the program. Overloaded methods give programmers the flexibility to call a similar method for different types of data. Overloading is also used on constructors to create new objects given different amounts of data.

What is method hiding?

Method hiding means subclass has defined a class method with the same signature as a class method in the superclass. In that case the method of superclass is hidden by the subclass. It signifies that: The version of a method that is executed will NOT be determined by the object that is used to invoke it.

Can constructor be inherited?

Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.

Can we override static method in Java?

Can we Override static methods in java? We can declare static methods with the same signature in the subclass, but it is not considered overriding as there won’t be any run-time polymorphism. Hence the answer is ‘No’.

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