- What is initialization and why is it important?
- Why is initialization important in Java?
- How is destructor overloading done?
- What is the purpose of constructor?
- What is an initialization constructor?
- What is the need for initialization of objects using a constructor?
- Why can’t a constructor be final?
- Can we override the constructor?
- What is difference between constructor and method?
- What is the purpose of initialization?
- What happens if a user forgets to define a constructor inside a class?
- Can constructor be private?
What is initialization and why is it important?
Answer: This refers to the process wherein a variable is assigned an initial value before it is used in the program.
Without initialization, a variable would have an unknown value, which can lead to unpredictable outputs when used in computations or other operations..
Why is initialization important in Java?
Java designers believe every variable should be properly initialized. To initialize a variable is to give it a correct initial value. It’s so important to do this that Java either initializes a variable for you, or it indicates an error has occurred, telling you to initialize a variable.
How is destructor overloading done?
An overloaded destructor would mean that the destructor has taken arguments. Since a destructor does not take arguments, it can never be overloaded.
What is the purpose of constructor?
The purpose of constructor is to initialize the object of a class while the purpose of a method is to perform a task by executing java code. Constructors cannot be abstract, final, static and synchronised while methods can be.
What is an initialization constructor?
Constructors for Initialization. Constructors for Initialization. A constructor is automatically called when an object of that class is declared. A constructor is placed in the public section of the class definition.
What is the need for initialization of objects using a constructor?
Each class you declare can optionally provide a constructor with parameters that can be used to initialize an object of a class when the object is created. Java requires a constructor call for every object that’s created, so this is the ideal point to initialize an object’s instance variables.
Why can’t a constructor be final?
The child class inherits all the members of the superclass except the constructors. In other words, constructors cannot be inherited in Java therefore you cannot override constructors. So, writing final before constructors makes no sense. Therefore, java does not allow final keyword before a constructor.
Can we override the constructor?
Constructor looks like method but it is not. It does not have a return type and its name is same as the class name. But, a constructor cannot be overridden. If you try to write a super class’s constructor in the sub class compiler treats it as a method and expects a return type and generates a compile time error.
What is difference between constructor and method?
Constructor is used to initialize an object whereas method is used to exhibits functionality of an object. Constructors are invoked implicitly whereas methods are invoked explicitly. Constructor does not return any value where the method may/may not return a value.
What is the purpose of initialization?
Initialization is the process of locating and using the defined values for variable data that is used by a computer program. For example, an operating system or application program is installed with default or user-specified values that determine certain aspects of how the system or program is to function.
What happens if a user forgets to define a constructor inside a class?
7. What happens if a user forgets to define a constructor inside a class? Explanation: The C++ compiler always provides a default constructor if one forgets to define a constructor inside a class.
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.