The correct answer is: A. A class can have only one constructor.
A constructor is a special type of method that is used to create an object of a class. It is called when an object is created, and it can be used to initialize the object’s data members. A class can have multiple constructors, but each constructor must have a different signature.
An object is an instance of a class. It is a concrete representation of a class. An object has its own memory location, and it can store data and methods.
Here is a simple example of a class:
“`class Person {
String name;
int age;
Person(String name, int age) {
this.name = name;
this.age = age;
}
}
“`
In this example, the Person class has two data members: name and age. It also has a constructor that takes two parameters: name and age. When an object of the Person class is created, the constructor is called to initialize the object’s data members.
For example, the following code creates a new object of the Person class:
Person person = new Person("John Doe", 30);
This code will call the Person constructor with the parameters "John Doe" and 30. The constructor will then initialize the object’s name and age data members to "John Doe" and 30, respectively.
The following code prints the object’s name and age data members:
System.out.println(person.name);
System.out.println(person.age);
This code will print the following output:
John Doe
30