attr_accessor is a Ruby language method used to create getter and setter methods for instance variables.
For example, if you have an instance variable @name, you can use attr_accessor to create getter and setter methods for it:
class Person
attr_accessor :name
end
person = Person.new
person.name = “John”
puts person.name # => “John
A constructor is a special type of method that is used to create an instance of a class. It is called when an object of a class is created and has the same name as the class. A constructor does not have a return type and is used to initialize the state of an object.
Example:
public class Car {
private String make;
private String model;
// Constructor
public Car(String make, String model) {
this.make = make;
this.model = model;
}
}
A method is an ordinary subroutine that is used to perform a specific task. It is declared with a return type and a name, and can take arguments. It is called on an instance of a class and can return a value.
Example:
public class Car {
private String make;
private String model;
// Method
public String getMake() {
return make;
}
}
A constructor is a special type of method that is used to create an instance of an object. It is invoked when an instance of the object is created and it is used to set up the initial state of the object.
A method is a block of code that performs a specific task and is associated with an object. It is invoked by calling the method on the object.
Example:
Constructor:
public class Car {
private String make;
private String model;
public Car(String make, String model) {
this.make = make;
this.model = model;
}
}
Method:
public class Car {
private String make;
private String model;
public void setMake(String make) {
this.make = make;
}
public void setModel(String model) {
this.model = model;
}
}
A class method is a method that is defined in a class and can be called directly from the class without having to create an instance of the class first. An example of a class method is the __init__() method in Python.
An instance method is a method that is defined in a class and can only be called on an instance of the class. An example of an instance method is the __str__() method in Python.
Vaibhav Kothia