Methods in Programming
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Questions and Answers

What is a necessary component for writing a correct recursive function?

  • A base case and a recursive case (correct)
  • Function must be void
  • A loop to control the recursion
  • Only a base case

    • What happens when a method reaches a return statement?

  • The method exits immediately and control returns to the invoking code. (correct)
  • The method throws an exception and stops execution.
  • The method continues executing until all statements are completed.
  • The method enters an infinite loop.

    • What condition must be true for the recursive function 'printHello' to stop executing?

  • The count must be less than 10
  • The count must be equal to 5
  • The count must be less than 5 (correct)
  • The count must be greater than 0

    • Which of the following is true about methods declared as void?

    <p>They can include a return statement without a value.</p> Signup and view all the answers

    What defines a string as palindromic in the provided algorithm?

    <p>The string reads the same backwards and forwards</p> Signup and view all the answers

    In the given example, what happens when the string has a length of 1 or 0 in the 'isPalindrome' function?

    <p>The function returns true</p> Signup and view all the answers

    What is the consequence of returning a value from a void method?

    <p>The method will result in a compiler error.</p> Signup and view all the answers

    In a method declared to return an integer, how should the return statement be structured?

    <p>return 0; // returning a constant</p> Signup and view all the answers

    What is the main purpose of the substring operation in the 'isPalindrome' function?

    <p>To recursively check the remaining characters</p> Signup and view all the answers

    What is necessary when declaring a parameter for a method?

    <p>The parameter name must be unique within the method's scope.</p> Signup and view all the answers

    Which data types can be used as parameters of a method?

    <p>Both primitive and reference data types.</p> Signup and view all the answers

    What will happen if a method's return value does not match its declared return type?

    <p>The method will produce a compiler error.</p> Signup and view all the answers

    Which of the following correctly describes the purpose of a return statement in a method?

    <p>It exits the method and passes control back to the caller.</p> Signup and view all the answers

    What are the required components of a method declaration?

    <p>Modifiers, return type, method name, parameter list, exception list, and method body.</p> Signup and view all the answers

    In method naming conventions, how should a multi-word method name be structured?

    <p>The first word should be lowercase, and subsequent words should start with uppercase letters.</p> Signup and view all the answers

    What does the method signature consist of?

    <p>The method name and the parameter types.</p> Signup and view all the answers

    What is the primary use of method overloading?

    <p>To allow methods with the same name to handle different parameter lists.</p> Signup and view all the answers

    If a method does not return a value, what return type should be used?

    <p>void</p> Signup and view all the answers

    What is NOT a component of a method declaration?

    <p>Data type of return value only</p> Signup and view all the answers

    What method declaration would be correct for a method that returns a string and takes two integers as parameters?

    <p>public String sumNumbers(int x, int y) {}</p> Signup and view all the answers

    Which of the following is an inappropriate naming convention for a method?

    <p>GetData</p> Signup and view all the answers

    What is the purpose of using varargs in a method declaration?

    <p>To enable methods to accept any number of parameters, including none.</p> Signup and view all the answers

    How are overloaded methods differentiated in Java?

    <p>By the number and type of arguments passed into the method.</p> Signup and view all the answers

    In the provided example of the totalSale method, how is the parameter sale treated?

    <p>As an array, regardless of how it is called.</p> Signup and view all the answers

    Which of the following statements about the printf method is true?

    <p>It supports printing an arbitrary number of objects.</p> Signup and view all the answers

    What is incorrect about the following method declaration: public void draw(String s)?

    <p>The method cannot have the same name as others with different parameters.</p> Signup and view all the answers

    What distinction is made between parameters and arguments in method calls?

    <p>Parameters refer to method declaration variables; arguments are the actual passed values.</p> Signup and view all the answers

    What would happen if the totalSale method is called with an array containing less than two elements?

    <p>It will throw an ArrayIndexOutOfBoundsException.</p> Signup and view all the answers

    Which of the following correctly describes how to call the method printf?

    <p>You can vary the number of arguments passed in depending on the number of placeholders.</p> Signup and view all the answers

    What happens to primitive arguments when passed to a method?

    <p>They are passed by value, and changes don't persist after returning.</p> Signup and view all the answers

    What is the result of changing the values in an array passed to a method?

    <p>The original array's values can be changed, but the reference remains the same.</p> Signup and view all the answers

    What happens when a new array reference is assigned inside a method?

    <p>The method's reference to the new array is lost once the method returns.</p> Signup and view all the answers

    Which of the following correctly describes the concept of varargs?

    <p>Lets you pass an arbitrary number of arguments of the same type.</p> Signup and view all the answers

    What will be printed when this code is executed: System.out.println("After invoking passMethod, x = " + x); if x was passed and remains unchanged?

    <p>The initial value of x before invoking passMethod.</p> Signup and view all the answers

    What is true about declaring methods with the same name?

    <p>You cannot declare two methods with the same signature, including return type.</p> Signup and view all the answers

    In the method changeArray(int[] someArray), what change persists after the method ends?

    <p>The first element of the original array changes to 2.</p> Signup and view all the answers

    What is the significance of the main method in a Java application?

    <p>It serves as the entry point for the application.</p> Signup and view all the answers

    Why can primitive types not hold references to their values when passed to methods?

    <p>They are passed by value, which copies their literal values.</p> Signup and view all the answers

    What is one clear distinction between passing primitive and reference data types?

    <p>Only reference types can be changed within a method.</p> Signup and view all the answers

    Which of the following statements about command-line arguments is accurate?

    <p>They allow users to modify the application's operations without recompiling.</p> Signup and view all the answers

    What is a common convention for the order of modifiers in the main method declaration?

    <p>public static</p> Signup and view all the answers

    Which of the following best describes recursion?

    <p>It is the process of methods invoking themselves.</p> Signup and view all the answers

    What argument type must the main method accept?

    <p>String[]</p> Signup and view all the answers

    What is a potential consequence of overloading methods?

    <p>Increased difficulty in understanding the code.</p> Signup and view all the answers

    Which statement about the main method's arguments is correct?

    <p>They can influence application behavior without code changes.</p> Signup and view all the answers

    Study Notes

    Methods in Programming

    • Methods are blocks of code used as functions
    • They accept input parameters
    • They perform calculations or operations using parameters

    Defining Methods

    • A typical method declaration includes:
      • Modifiers (e.g., public, private)
      • Return type (data type of returned value; or void if no value is returned)
      • Method name
      • Parameter list (comma-separated list of input parameters, enclosed in parentheses)
      • Exception list (not covered in detail)
      • Method body (the code to be executed, including local variables)

    Returning a Value

    • return statements are used to return values from a method
    • The return value's data type must match the method's declared return type
    • A method declared as void does not need a return statement (but may still contain one)

    Passing Information

    • Primitive data types (like int, double) are passed by value; changes within the method do not affect the original variable.
    • Reference data types (e.g., arrays) are passed by value; changes to the contents of the referenced object within the method do affect the original object.

    Overloading Methods

    • Methods can share the same name if their parameter lists differ (parameter type and/or number)

    The Main Method

    • main() method is where execution of a Java program starts
    • It is a static method accepting a String array argument

    Recursion

    • Recursion is where a method calls itself
    • Crucial for base cases and recursive steps to avoid infinite loops

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    Java Methods Explained PDF

    Description

    This quiz covers the fundamentals of methods in programming, including method declarations, return types, and how to return values. You'll explore how methods accept parameters, and the differences in passing primitive and reference data types. Test your understanding of these essential programming concepts.

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