Hello

I Have a question about constructor

What is the main role of  constructor !

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Edité par akilaabbb 20 décembre 2014 à 18:43:00

The goal of a constructor is to create an object of a specified class and to initialize all its fields.

Hi, also there is two kind of constructor , the first is :  constructor without  initialization, the second is : constructor with initialization that initialize all the  fields of the object .

A constructor always initializes all the fields of the object which is created. If no value is specified for a field, it is initialized to the default value for its type (0 for numbers, '\u0000' for characters, false for booleans and null for objects).

also , if you don't define a default contructor , it is defined implicitelly , other thing is if you define a constructor with fields , and you don't define the default  constructor , yout get error by making  MyClass m=new MyClass() ; you are permeted to use just the contructor that you define explicitely