Let’s say you’re writing a method named increaseAgeByFive() that is trying to increase the instance variable of the Dog class named age by 5. However, there is also a local variable named age. How would you increase only the instance variable by 5.1 pointthis.Dog += 5;self.age += 5;Dog.age += 5;age += 5;this.age += 5;
Question
Let’s say you’re writing a method named increaseAgeByFive() that is trying to increase the instance variable of the Dog class named age by 5. However, there is also a local variable named age. How would you increase only the instance variable by 5.1 pointthis.Dog += 5;self.age += 5;Dog.age += 5;age += 5;this.age += 5;
Solution
The correct way to increase the instance variable by 5 in this case would be to use the keyword "this" to refer to the instance variable. So the correct code would be:
this.age += 5;
This is because "this" keyword in many object-oriented programming languages like Java, JavaScript, C++, C#, etc., is used inside a method to refer to the current object. In this case, "this.age" refers to the age of the current Dog object, not the local variable "age".
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