Difference Between Constructor and Method (With Table)

Java is an option-oriented programming language. A programming language that helps its users to develop a code that is to be written once and can be run on various platforms. These platforms must support Java and do not need any recompilation. The developer of the Java Programming Language is James Gosling.

Constructor vs Method

The difference between Constructor and Method is that Constructor is used to invoking implicitly by the system while Method is used to invoke during the program code. Also, it is stated that the Constructor must be the same name of the class, and contrastingly, the name of the Method cannot be the same as the class.

In object-oriented programming, a Constructor is a special type of sequence of program instruction that helps in creating a new object. It is said to be both explicit and implicit, i.e., it comes with parameterized constructor and no Arg constructor. They also have an add-on feature that can be overridden.

The method is also object-oriented programming (OOP), which allows a specific sequence of programs associated with the message and the object. The method is said to be only explicit, which means it comes with the parameterized constructor. It also entails statements that do not always return an output.

Comparison Table Between Constructor and Method

Parameters of ComparisonConstructorMethod
InvocationIt is invoked implicitly by the system.It is invoked during the program code.
UsesIt is used to initialize an object.It is used to exhibit the functionality of an object.
InheritanceIt cannot be inherited by a subclass.It is inherited by a subclass.
Return TypeIt does not have any return type.It has a return type.
NameIt is said that the name of the constructor must be the same as the class.It is said that the name of the method cannot be the same as the class.

What is Constructor?

A Java Constructor can be defined as the object-oriented program (OOP), with which a specific series of sequence of the program which will help to create a new object. It consists of both explicit (parameterized constructor) and implicit (no Arg constructor). It can be overloaded but cannot be overridden. Also, it cannot be static, abstract, or real. The Constructor initializes an object and does not have any return type. It is said that the name of the constructor should be the same as the class. 

For Example –

unit Test {

     Test () {

          // constructor body

       }

    }      

In the above example, Test () is said to be the constructor. Thus, it proves the constructor has the same name and does not have any return type.

In the Java programming language, Constructors are of three types –

  1. No-Arg Constructor – It is said to be that Java Constructor may or may not have any parameters.
  2. Parameterized Constructor – The constructors which can accept one or more parameters are called Java Parameterized Constructor (constructor with parameters).
  3. Default Constructor ­– When no one creates any constructor, the Java compiler itself creates a constructor automatically while running a program. Thus, it is called a default constructor. 

What is Method?

The Method is object-oriented programming (OOP) language, allows its user to run a specific series of the program that is associated with the message and the object. The Method is designed to perform only specific tasks and functions. Unlike Constructor, it cannot have the same name of the constructor as the class. It also has a return type (including void). It is said to be that the Method should always be explicit (Parameterized Constructor).

Comparing to the Constructor, the Java compiler does not provide any default method if not created manually. Non-static methods are said to be inherited, and also, they can be overridden. The method may be called by using any object (non-static method), class reference (static method), or name. They also accept different parameter values. For Example –

Burner has methods such as on or off, although the state of the burner, which is on or off, must be somewhat at a point of given time. This is known to be the property of the Burner. 

Main Differences Between Constructor and Method

  1. Constructor is said to be used to invoke implicitly by the system while Method is used to invoke during the program code.
  2. Also, if there is an absence of a Constructor, then a default constructor can be taken into use which is provided by the Java compiler itself, while there is no default method that can be used in case of its absence.
  3. Constructor is said to be not inherited by any subclass, while Method can be inherited by a subclass.
  4. Constructors do not have any return type, while Method has a return type.
  5. While it is believed that name of the Constructor must be the same as the class in contrast method.
  6. Constructors are said to be non-inherited, while contrastingly, non-static methods are said to be inherited.
  7. A Constructor can never be overridden while a Method can be so.
  8. Java compiler provides a default constructor if you didn’t provide one but not a default Method.

Conclusion

Java programming helps in developing many new applications. Constructor and Method are the two terms associated with the Java programming language. Both the terms are entirely different from each other.

On the one hand, a Constructor is an object-oriented program (OOP) along with a specific sequence of programs that helps in creating a new object. Also, the name of the constructor is said to be the same as the class. It is not inherited by any subclass. Nor can be overridden and any return type.

On the other hand, Method is also an object-oriented program followed by a specific sequence of programs that accompany with message and object. It must always be explicit. Must have a return type and is inherited by a subclass. Even though the Java compiler does not provide any default method.

References

  1. https://link.springer.com/article/10.1007/s100440200009
  2. https://ieeexplore.ieee.org/abstract/document/502681
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