Chapter 13: Problem 40

A class may have more than one constructor, as long as each has a different _________.

Short Answer

Expert verified

Answer: The factor that allows a class to have multiple constructors is having different input parameter lists for each constructor. This helps the compiler differentiate between the constructors when creating objects of the class.

Step by step solution

Understand constructors in a class

A constructor is a special method in a class that is called when an object of the class is created. Constructors help in initializing the object's variables and setting up the initial state of the object. In most programming languages, constructors have the same name as the class and can be defined with or without input parameters.

Factors allowing multiple constructors in a class

In order to have multiple constructors in a class, each constructor must be unique so that the language compiler can differentiate between them when creating objects. The factor that allows them to be unique is different input parameter lists.

Illustrate with an example

Let's consider an example in Java: ```java class MyClass { // Constructor 1 - with no input parameters public MyClass() { System.out.println("Constructor 1 called"); } // Constructor 2 - with one integer input parameter public MyClass(int num) { System.out.println("Constructor 2 called"); } // Constructor 3 - with two integer input parameters public MyClass(int num1, int num2) { System.out.println("Constructor 3 called"); } } ``` In this example, we have multiple constructors in the MyClass, and they have the same name but different input parameter lists. This allows the Java compiler to differentiate between them when creating objects of the MyClass.

Understanding object creation with multiple constructors

When multiple constructors are present in a class, the appropriate constructor is called based on the input parameters provided during object creation. For example, let's create objects of MyClass: ```java public class Main { public static void main(String[] args) { MyClass obj1 = new MyClass(); // Calls Constructor 1 MyClass obj2 = new MyClass(5); // Calls Constructor 2 MyClass obj3 = new MyClass(3, 7); // Calls Constructor 3 } } ``` As we can see, different constructors are called based on the input parameters provided while creating objects of MyClass.

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A class may have more than one constructor, as long as each has a different _________.

Short Answer

Step by step solution

Understand constructors in a class

Factors allowing multiple constructors in a class

Illustrate with an example

Understanding object creation with multiple constructors

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