Can we call one constructor from another in Java?

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”.

Can I call constructor from another constructor Java?

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.

How do you call a constructor from another class in Java?

Constructor chaining can be done in two ways:

  1. Within same class: It can be done using this() keyword for constructors in same class.
  2. From base class: by using super() keyword to call constructor from the base class.
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How do you call a constructor from another constructor in the same class?

The invocation of one constructor from another constructor within the same class or different class is known as constructor chaining in Java. If we have to call a constructor within the same class, we use ‘this’ keyword and if we want to call it from another class we use the ‘super’ keyword.

Can a constructor call other methods Java?

Yes, as mentioned we can call all the members of a class (methods, variables, and constructors) from instance methods or, constructors.

Can you have more than one constructor in a class Java?

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 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 would you call a constructor from another constructor?

Constructor chaining in Java is a technique of calling one constructor from within another constructor by using this and super keywords. The keyword “this” is used to call a constructor from within another constructor in the same class.

Can a class have private constructor?

Yes. Class can have private constructor. Even abstract class can have private constructor. By making constructor private, we prevent the class from being instantiated as well as subclassing of that class.

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Can a class be declared inside another class?

A class can be declared within the scope of another class. Such a class is called a “nested class.” Nested classes are considered to be within the scope of the enclosing class and are available for use within that scope.

Can a class constructor be called more than once?

java is called. Constructors are special and different from other methods. 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.

Can we have both default constructor and parameterized constructor in the same class?

We can have any number of Parameterized Constructor in our class. In this example, I have implemented four constructors: one is default constructor and other three are parameterized. During object creation the parameters we pass, determine which constructor should get invoked for object initialization.

Can we call parameterized constructor from default constructor?

You can’t call a default constructor once you’ve created a constructor that takes arguments. You’ll have to create the no argument constructor yourself in order to make a call from the parameterized constructor.

Can a constructor call another method?

Constructors of final classes may call any of their methods, as (by definition) they cannot be derived from.

Is it OK to call methods in constructor?

You shouldn’t: calling instance method in constructor is dangerous because the object is not yet fully initialized (this applies mainly to methods than can be overridden). Also complex processing in constructor is known to have a negative impact on testability.

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Can we call function from constructor?

Calling virtual functions from a constructor or destructor is considered dangerous most of the times and must be avoided whenever possible. All the C++ implementations need to call the version of the function defined at the level of the hierarchy in the current constructor and not further.

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