
function - Purpose of a constructor in Java? - Stack Overflow
Nov 13, 2013 · A constructor is used to create an instance of the class Card. And you'll need to call it 52 times to have 52 cards: new Card(1, "hearts"), etc. Now each instance of Player (you …
Java default constructor - Stack Overflow
Dec 20, 2010 · What exactly is a default constructor — can you tell me which one of the following is a default constructor and what differentiates it from any other constructor? public Module() { …
java - Can a class have no constructor? - Stack Overflow
Dec 8, 2012 · Java does not actually require an explicit constructor in the class description. If you do not include a constructor, then the Java compiler will create a default constructor with an …
java - Should I initialize variable within constructor or outside ...
Instead of defining and calling a private constructor from all other constructors, you could also define an instance initializer, which will automatically be called before every constructor. That …
java - Why do this () and super () have to be the first statement in …
Jul 23, 2009 · Java requires that if you call this() or super() in a constructor, it must be the first statement. Why? For example: public class MyClass { public MyClass(int x) {} } public class …
Do I really need to define default constructor in java?
Jan 10, 2017 · A default (no-argument) constructor is automatically created only when you do not define any constructor yourself. If you need two constructors, one with arguments and one …
java - Why default constructor is required in a parent class if it has ...
My understanding is that the default constructor is an implicit parameterless constructor. It is only automatically added to a class when no other constructors exist. This would indicate an …
super () in Java - Stack Overflow
Sep 22, 2010 · 1 Just super (); alone will call the default constructor, if it exists of a class's superclass. But you must explicitly write the default constructor yourself. If you don't a Java …
java - How can I access a private constructor of a class ... - Stack ...
Apr 8, 2010 · I am a Java developer. In an interview I was asked a question about private constructors: Can you access a private constructor of a class and instantiate it? I answered …
java - Should I instantiate instance variables on declaration or in …
Instead, the Java compiler generates instance-field initialization code automatically and puts it in the constructor or constructors for the class. The initialization code is inserted into a …