Yes,
any number of constructors can be present in a class
and they can be called by another constructor using this() [Please do not confuse this() constructor call with this keyword]. this() or this(args) should be the first line in the constructor. This is known as constructor overloading.
Can a constructor Cannot call another overloaded constructor?
You cannot explicitly call another constructor in any other statement
of a constructor, and you cannot call any defined static constructor. … So, in any chain of explicit calls from one overloaded constructor to another, the last overloaded constructor in the chain must invoke a super class constructor.
Can a constructor call another constructor C
No, you can’t call one constructor from another
in C++03 (called a delegating constructor).
How would you call a constructor from another constructor in the same class?
To call one constructor from another constructor is called
constructor chaining
in java. This process can be implemented in two ways: Using this() keyword to call the current class constructor within the “same class”. Using super() keyword to call the superclass constructor from the “base class”.
Can a class constructor be called more than once?
Constructor is called automatically when we create an object using new keyword. It is called
only once for an object at the time of object creation
and hence, we cannot invoke the constructor again for an object after it is created.
Can a class have multiple constructors?
The technique of having two (or more) constructors in a class is known as constructor overloading. A class can have multiple constructors
that differ in the number
and/or type of their parameters. It’s not, however, possible to have two constructors with the exact same parameters.
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 an overloaded constructor?
We can call an overloaded constructor from another constructor using this keyword but the constructor must be belong to the same class, because this keyword is pointing the members of same class in which this is used. This type of calling the overloaded constructor also termed as
Constructor Chaining
.
Can constructor be private?
Yes, we can declare a constructor as private
. If we declare a constructor as private we are not able to create an object of a class. We can use this private constructor in the Singleton Design Pattern.
Why is constructor chaining required?
Constructor Chaining in Java is
used when we want to pass parameters through multiple different constructors using a single object
. … Whenever you want to make changes in the parameter you will have to make changes inside each constructor. Note: In Java, it is invalid and illegal to call the constructor directly by name.
Can you call a sub class constructor from super class constructor?
You cannot call a sub-class constructor
from a super-class constructor.
Can we have this and super in the same constructor?
both this() and super() can not be used together in constructor
. this() is used to call default constructor of same class.it should be first statement inside constructor. super() is used to call default constructor of base class.it should be first statement inside constructor.
Can we call constructor 2 times?
The intent of constructors is to create the object, so each time you use the new operator, the constructor is called and a new object is created.
You can not call the constructor directly
.
Is constructor only called once?
A
constructor can only be called once
, to create the object. … However, you can call constructors to create other objects. Once the object is created, you use the other methods listed.
Can a class have 0 constructor defined?
It is possible for a class to have no constructor
. (An important distinction to draw here is that the JVM does not require all class files to have a constructor; however, any class defined in Java does have a default constructor if a constructor is not explicitly declared.
Can a constructor have any name?
Yes,
the constructor should always have the same name as the class
. … Mostly it is used to instantiate the instance variables of a class. If the programmer doesn’t write a constructor the compiler writes a constructors on his behalf.
