Quiz on Method Overloading

What is method overloading?

• Creating multiple methods with the same name but different parameters

• Creating methods that only accept one type of parameter

• Creating methods with different names

• Creating methods that cannot be reused

Answer explanation

Method overloading allows the creation of multiple methods with the same name but different parameters, enabling flexibility in method usage based on the input types or number of arguments.

How many types of parameters can be used in method overloading?

• No parameters

• Different types or different numbers

• Two types

• Only one type

Answer explanation

Method overloading allows methods to have the same name but different parameters. This can be achieved by using different types of parameters or varying the number of parameters, making 'Different types or different numbers' the correct choice.

In the example, what is the first parameter type of the Details method?

• double

• int

• char

• String

Answer explanation

The first parameter type of the Details method is String, as indicated in the example. This means it expects a sequence of characters as input, making String the correct choice.

What will be printed when Details("Ridhi", 89) is called?

• Welcome Ritesh Your got 89 marks in exam.

• Welcome Ridhi Your got 89 marks in exam.

• Welcome Ridhi Your got 0 marks in exam.

• Welcome Ridhi Your got 93.5 marks in exam.

Answer explanation

The function call Details("Ridhi", 89) correctly uses the name 'Ridhi' and the score 89, resulting in the output: 'Welcome Ridhi Your got 89 marks in exam.' This matches the second answer choice.

What is the second parameter type in the second Details method?

• float

• double

• int

• String

Answer explanation

The second Details method has a second parameter of type double, which is used for representing decimal values with higher precision than float. This makes double the correct choice among the options provided.

What does the static keyword indicate in the Details method?

• The method is private

• The method cannot be called

• The method belongs to the class, not instances

• The method can be overridden

Answer explanation

The static keyword indicates that the method belongs to the class itself rather than to any specific instance of the class. This means it can be called without creating an instance, making it accessible at the class level.

What will happen if you call Details("Ritesh", 93) instead of Details("Ritesh", 93.5)?

• It will call the second Details method

• It will throw an error

• It will compile successfully

• It will call the first Details method

Answer explanation

Calling Details("Ritesh", 93) will throw an error because it does not match any overloaded method signature. The method expects a double (93.5) instead of an integer (93), leading to a type mismatch.

Which of the following is NOT a valid method overload?

• Details(String, int)

• Details(String, double)

• Details(int, String)

• Details(double, String)

Answer explanation

The method overload Details(int, String) is not valid because it conflicts with the method signature Details(String, int). In method overloading, the parameter types must differ in order to distinguish between them.

What is the output of the line System.out.println("Your got " + marks + " marks in exam."); when marks is a double?

• Your got 89 marks in exam.

• Your got 93.5 marks in exam.

• Your got 0 marks in exam.

• Your got marks marks in exam.

Answer explanation

The output will display the value of 'marks' as a double. If marks is 93.5, the correct output is 'Your got 93.5 marks in exam.' This matches the second answer choice.

What is the purpose of method overloading?

• To reduce the number of methods in a class

• To make methods private

• To allow methods to perform similar functions with different inputs

• To create unique method names

Answer explanation

The purpose of method overloading is to allow methods to perform similar functions with different inputs. This enables flexibility in how methods can be called, depending on the parameters provided.