INTERVIEW QUESTIONS J2EE CORE JAVA DETAILS

Question: What are the differences between Contructors and Methods?

Answer: Constructors Methods

Purpose


Create an instance of a class


Group Java statements

Modifiers


Cannot be abstract, final, native, static, or synchronized


Can be abstract, final, native, static, or synchronized

Return Type


No return type, not even void


void or a valid return type

Name


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

this


Refers to another constructor in the same class. If used, it must be the first line of the constructor


Refers to an instance of the owning class. Cannot be used by static methods.

super
Calls the constructor of the parent class. If used, must be the first line of the constructor Calls an overridden method in the parent class

Inheritance
Constructors are not inherited Methods are inherited

Constructors Methods

Purpose


Create an instance of a class


Group Java statements

Modifiers


Cannot be abstract, final, native, static, or synchronized


Can be abstract, final, native, static, or synchronized

Return Type


No return type, not even void


void or a valid return type

Name


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

this


Refers to another constructor in the same class. If used, it must be the first line of the constructor


Refers to an instance of the owning class. Cannot be used by static methods.

super
Calls the constructor of the parent class. If used, must be the first line of the constructor Calls an overridden method in the parent class

Inheritance
Constructors are not inherited Methods are inherited Source: CoolInterview.com

Constructors are invoked using the new keyword. Methods can be invoked by using the dot operator on the object of the class. Source: CoolInterview.com

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