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What is the difference between a constructor and a method in Java?

Difference between a constructor and a method in Java?


In Java, a constructor is a special method that is used to initialize an object when it is created, while a method is a regular function that can be called on an object to perform some operation. Here are some differences between the two:

  1. Name: A constructor has the same name as the class, while a method can have any valid name.

  2. Return Type: A constructor does not have a return type, while a method can have a return type.

  3. Invocation: A constructor is called implicitly when an object is created, while a method is called explicitly using the object reference.

  4. Accessibility: A constructor can have access modifiers (public, private, protected) but it cannot be abstract, static or final, while a method can have any access modifier and can be abstract, static, or final.

  5. Purpose: A constructor is used to initialize the state of an object when it is created, while a method is used to perform some operation on an object.

  6. Overloading: A class can have multiple constructors with different parameters (constructor overloading), while a method can also be overloaded with different parameters.

In summary, constructors are used to creating objects and initialize their state, while methods are used to perform operations on objects after they have been created.


In Java, a constructor is a special type of method that is called when an object is created, while a method is a regular function that performs some action on an object. Here are some differences between the two:

  1. Naming and Return Type: A constructor has the same name as the class and does not have a return type, while a method has a different name than the class and has a return type.

  2. Invocation: A constructor is invoked when an object is created using the new keyword, while a method is invoked using an object reference or the class name (in the case of a static method).

  3. Purpose: The purpose of a constructor is to initialize the object's state, while the purpose of a method is to perform some action on an object.

  4. Accessibility: A constructor can have access modifiers like public, private, protected or default, while methods can also have access modifiers but constructors can only be accessed through instantiation of objects.

  5. Overriding: Constructors cannot be overridden, while methods can be overridden in subclasses.

In summary, a constructor is a special type of method that is used to initialize the state of an object, while a method is a regular function that performs some action on an object. Constructors are always called when an object is created, while methods are called when they are explicitly invoked

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