Question: Can We Have A Constructor With All Default Arguments?

What happens if a user forgets to define a constructor inside a class?

Also if any user forgets to define init() function then no object will be initialized whereas if any constructor is not defined in any class the class provides a default constructor for initialization.


What is a copy constructor?.

What Cannot be placed by non default arguments?

7. What we can’t place followed by the non-default arguments? Explanation: To avoid the ambiguity in arguments. … Explanation: As a rule, the default argument must be followed by default arguments only.

How many arguments are present for default constructor?

There are two type of constructor in Java: No-argument constructor: A constructor that has no parameter is known as default constructor. If we don’t define a constructor in a class, then compiler creates default constructor(with no arguments) for the class.

How many constructor can a class have?

65535 constructorsYou can have 65535 constructors in a class(According to Oracle docs). But IMPORTANTLY keep this in your mind. We achieve this only by CONSTRUCTOR OVERLOADING ( ). You can create many constructors but with different signatures.

What is the utility of default arguments?

The default arguments are used when you provide no arguments or only few arguments while calling a function. The default arguments are used during compilation of program.

What is the benefit of giving a constructor with default arguments?

Answer: • It prevents us from having to provide an overloaded constructor that takes no parameters. • It is convenient by providing the default common initial values than specifying them each time an object is declared.

Can a constructor be overloaded?

Yes! Java supports constructor overloading. In constructor loading, we create multiple constructors with the same name but with different parameters types or with different no of parameters.

How do you call a constructor?

No, you cannot call a constructor from a method. The only place from which you can invoke constructors using “this()” or, “super()” is the first line of another constructor. If you try to invoke constructors explicitly elsewhere, a compile time error will be generated.

What is a constructor argument?

A constructor parameter is special type of local variable that is created as part of a constructor-method definition. A value supplied to a constructor parameter when an object is instantiated (as shown in the preceding code) is known as a constructor argument. …

Is constructor inherited?

Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.

Can a constructor be empty?

An empty constructor is needed to create a new instance via reflection by your persistence framework. If you don’t provide any additional constructors with arguments for the class, you don’t need to provide an empty constructor because you get one per default.

What do you call a constructor that accepts no arguments?

In both Java and C#, a “default constructor” refers to a nullary constructor that is automatically generated by the compiler if no constructors have been defined for the class. … A programmer-defined constructor that takes no parameters is also called a default constructor in C#, but not in Java.

Can constructors take arguments?

Typically, the constructor initializes the fields of the object that need initialization. Java constructors can also take parameters, so fields can be initialized in the object at creation time.

Does constructor return any value?

No, constructor does not return any value. While declaring a constructor you will not have anything like return type. In general, Constructor is implicitly called at the time of instantiation.