Java Methods Quiz

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Questions and Answers

In Java, what is the main advantage of using methods (sub-programs)?

Allowing solutions to larger problems

What is the primary purpose of dividing initial problems into smaller sub-problems in structured programming?

Solving larger problems effectively

Which programming approach emphasizes the use of methods (sub-programs) to implement multiple algorithms?

Structured programming

What is a key benefit of using methods in programming?

Enabling code reusability Signup and view all the answers

What concept is associated with the method construct in Java?

Parameter passing Signup and view all the answers

In Java, what does call-by-value parameter passing entail?

Passing the value of the actual parameter to the formal parameter Signup and view all the answers

What is the main purpose of using parameters in Java methods?

Customizing method behavior Signup and view all the answers

What does the scope of a variable in programming refer to?

The region of the program where the variable is accessible Signup and view all the answers

What is the primary advantage of using structured programming?

Effective problem-solving Signup and view all the answers

What skill is required for both structured and Object Oriented programming approaches?

Algorithm development Signup and view all the answers

What is the return type of a method that does not return anything in Java?

void Signup and view all the answers

Which type of method in Java carries out an action but does not return a value?

void method Signup and view all the answers

In Java, what is the mechanism of parameter passing that is explained in the text?

Call by value Signup and view all the answers

What will be written to the console by the squareAction method in different scenarios?

As per the scenarios discussed in the text Signup and view all the answers

Which type of methods will be learned about in the next semester according to the text?

Static and non-static methods Signup and view all the answers

What is the return type of a method that returns a value in Java?

Non-void Signup and view all the answers

Which type of parameters are discussed in the text?

Formal and actual parameters Signup and view all the answers

What does a method with a return type of 'void' do in Java?

Does not return anything Signup and view all the answers

What is the type of methods introduced in the text?

Static methods Signup and view all the answers

What is the usage of the methods discussed in the text?

Explained, including how they are called and the scenarios in which they are automatically called Signup and view all the answers

Which of the following best describes the duration of an identifier in memory in Java?

It depends on whether it is a parameter or local variable in a method body Signup and view all the answers

What does the scope of an identifier in Java determine?

Where it can be referenced in the program Signup and view all the answers

Why should variables be declared as locally as possible in Java?

To limit accidental changes Signup and view all the answers

What happens when a method is called in Java?

The current method's execution halts until the called method is finished Signup and view all the answers

What is the recommended practice regarding the functionality of each method in Java?

Each method should perform one defined task and contain a reasonable amount of code Signup and view all the answers

What is the purpose of testing methods separately before adding them to the main program in Java?

To ensure that each method functions correctly in isolation Signup and view all the answers

In the context of Java methods, what does call-by-value parameter passing refer to?

The method receives a copy of the actual parameter's value Signup and view all the answers

What is the purpose of the scope of an identifier in Java?

To define where the identifier can be referenced in the program Signup and view all the answers

What is the difference between action and value methods in Java?

Action methods perform a task while value methods return a value Signup and view all the answers

What does the duration of an identifier in memory depend on in Java?

Whether it is a parameter or local variable in a method body Signup and view all the answers

Study Notes

Java Method Concepts and Implementation

The squareValue method returns a value for use in another method
The duration of an identifier in memory depends on whether it is a parameter or local variable in a method body
The scope of an identifier in Java determines where it can be referenced in the program
Variables should be declared as locally as possible to limit accidental changes
When a method is called, the current method's execution halts until the called method is finished
It is recommended that each method performs one defined task and contains a reasonable amount of code
Methods should be tested separately before being added to the main program
An example is given of a method to prompt the user for a VAT code, which can be used in the main method
A more reusable method for input number in a range is presented in a separate class called NumInput
The Vat program calls the getInRange method from the NumInput class
The concepts covered in the text include method constructs and their implementation in Java, the difference between action and value methods, using parameters in Java methods, call-by-value parameter passing, and the scope and duration of variables
An extreme "functional" example demonstrates the use of methods in a more concise and functional manner

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Java Method Concepts Quiz