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Java Programming

Why do you use constructors?

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Answered 2011-01-19 18:39:00

A constructor lets you write code that will be executed when the class is instantiated with the "new" keyword.

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Constructors must be public so other classes can create instances of that class. If the constructors were private, no class can use it!

Constructors are used in object-oriented programming languages to create usable instances of abstract data types (classes).

Yes, yes, and yes. Java constructors may use any access modifier.

Constructors are a C++ topic, so there are no constructors in C.

To create an instance of the class that implementing that constructor

I dont think we can have Protected Constructors but yes we can have Private constructors. We can declare the constructor as Private to ensure that no other class can instantiate it. We use this in the singleton design pattern

Constructors are of two types: * Public Constructors * Private Constructors Public constructors are normal constructors that are used to instantiate Java classes from other classes. They are most commonly used in almost all Java classes. Private constructors are special type of constructors that are used when the programmer does not want anyone else to instantiate his class freely like public constructors. These are usually used in Singleton model of programming where there can be only one instance of a particular class for the whole application.

We use constructor to initialize the instant variable of a particular class that is used for the various operations.

Yes. You can have multiple constructors with the same name and with different arguments

Constructors are used to create the instance of a class.

Worshipful Company of Constructors was created in 1985.

Constructors, static initializers, and instance initializers are not members and therefore are not inherited.

A class may have any number of constructors, private or not.

To give multiple options of how you can create an object of the current class

Every class, including abstract classes, MUST have a constructor. The different types are: a. Regular constructors b. Overloaded constructors and c. Private constructors

You will use Private constructors when you dont want any other class to instantiate your current class using a new keyword. ex: Ferrari obj = new Ferrari(); The above line of code will not work if the constructor of the Ferrari class is declared private

Basically they are all constructors of the same class. Not in C, though: there's no classes in C.

The cast of Constructors - 2013 includes: Rauf Khabibullin as Rauf

Constructors have no value, zero or otherwise. That is, constructors cannot return a value. This is because constructors are not functions in the sense you cannot call a constructor directly. Constructors are invoked in the background when you instantiate an object of the class, thus any return value would be lost in the background, and would therefore not be visible to the invokee.

There is no reason that you cannot use static variables in constructors. Just keep in mind that static variables are shared among all instances of a class, so class constructors should not be used to initialize them.

Yes, you can use, and often you should, use more than one constructor in a class in C++. Normally, there is a default constructor, a copy constructor, and one or more conversion constructors. Sometimes, there are also other constructors, overloaded based on argument signature, if there are complex situations.

As many as are required for the class to function. All classes other than static classes require at least one constructor. Most classes will also provide copy and move constructors (with corresponding copy and move assignment operators). Additional constructors are usually provided to increase the flexibility of the class, allowing users a variety of ways to initialise objects of the class. Constructors that accept just one argument (excluding the copy and move constructors) are regarded as being conversion constructors because, from a user's perspective, they effectively convert their argument into an object of the class. Although there is effectively no limit to the number of constructors you can define, do keep in mind the mantra that simple concepts should be expressed simply and no simpler. Make good and proper use of inline initialisation, default arguments and delegation. Use explicit constructors to avoid narrowing issues and implicit conversions where narrowing is acceptable. Also, make good use of RAII (resource acquisition is initialisation) to ensure proper cleanup should any member fail to initialise during construction. For efficiency, perform as much initialisation as possible outside the body of the constructor. Ideally, the constructor body should contain no code at all.

According to a beginner's book on Java, an interface can't have constructors. Also, the interface itself can't contain the method implementation.

The 09 Formula One World Constructors' Championship was won by Brawn with a Mercedes engine.

No. Pythons are constructors.

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