Java | Constructor vs. Method

If you are within your first year of application development in Java you may have asked yourself this question. I know I did.

What is the difference?

Java

Here is a reference list that I have compiled for your convenience.

Download the excel file and build upon other comparisons you need to keep track of –>constructor-vsmethods.xlsx

Topic

Constructors

Methods

Purpose

Create an instance of a class – Object Initialization Grouped Java statements – Each performs a small unit or task

Modifiers

No – Cannot be abstract, final, native, static, or synchronized, already marked as final & static. Yes – Can be abstract, final, native, static, or synchronized

Has a Return type

No – not even void Yes – void or a valid return type

Naming Convention

Same name as the class, first letter is capitalized by convention) — usually a noun Any name except the class. Method names begin with a lowercase letter by convention — usually the name of an action

Inheritance

No – Constructors are not inherited Yes – Methods are inherited

Compiler automatically supplies a default constructor

If the class has no constructor, a no-argument constructor is automatically supplied Does not apply

Compiler automatically supplies a default call to the super-class constructor

If the constructor makes no zero-or-more argument calls to super, a no-argument call to super is made Does not apply

Can be Overloaded/Overwritten?

Yes Yes

Can be public, protected, private?

Yes Yes

Must be same name as Class?

Yes No, arbitrary

chained and they are called in a particular order

Yes No