java ### QUESTION 17Consider the following `Rectangle` Class:```javapublic class Rectangle { private int width; private int length; public void Rectangle(int w , int len) { width = w; length = len; } /** * if width or length is less than 1 return -1 * otherwise return the width * length */ public double findArea() { // code to implement findArea // .............. }}```**What is the output of the following code snippet? Explain your answer.**```javaRectangle r1 = new Rectangle(3, 0);System.out.println(r1.findArea());```### Explanation:In this question, we have a `Rectangle` class with two private data members `width` and `length`. The constructor, named `Rectangle`, initializes these data members. The `findArea` method is supposed to calculate the area of the rectangle and return it. If either `width` or `length` is less than 1, it should return `-1`, otherwise, it should return the product of `width` and `length`.However, there is an issue:1. **Constructor Implementation Issue**: - The constructor is defined as `public void Rectangle(int w, int len)` which makes it a method, not a constructor. Constructors do not have a return type. - To correct it, the constructor should be defined as: ```java public Rectangle(int w, int len) { width = w; length = len; } ```2. **In the `findArea` method**, the implementation for calculating and returning the area is missing. It should be implemented as per the given specification: ```java public double findArea() { if (width < 1 || length < 1) { return -1; } else { return width * length; } } ```Given the current state of the `Rectangle` class in the question, attempting to instantiate it and call `findArea` using the following code:```javaRectangle r1 = new Rectangle(3, 0);System.out.println(r1.findArea());```This would lead to errors because:- `Rectangle` is not properly instantiated due to the incorrect constructor.- `findArea` method is not implemented.**Correcting the

Here we are creating in Rectangle object ar1 by passing 3 as width and 0 as length. By…

Consider the following Rectangle Class: public class Rectangle { private int width; private int length; public void Rectangle (int w, int len) { width = w; length = len; } /** * if width or length is less than 1 return -1 otherwise return the width * length */ public double findArea() { // code to implement findArea //.... } } What is the output of the following code snippet? Explain your answer. Rectangle r1 = new Rectangle (3, 0); System.out.println(r1.findArea());

Consider the following Rectangle Class: public class Rectangle { private int width; private int length; public void Rectangle (int w, int len) { width = w; length = len; } /** * if width or length is less than 1 return -1 otherwise return the width * length */ public double findArea() { // code to implement findArea //.... } } What is the output of the following code snippet? Explain your answer. Rectangle r1 = new Rectangle (3, 0); System.out.println(r1.findArea());

EBK JAVA PROGRAMMING

9th Edition

ISBN:9781337671385

Author:FARRELL

Publisher:FARRELL

Chapter2: Using Data

Section: Chapter Questions

Problem 14RQ

See similar textbooks

Similar questions

A(n) ____________ is one instance or variable of a class.
In previous chapters, you have created programs for the Greenville Idol competition. Now create a Contestant class with the following characteristics: The Contestant class contains public static arrays that hold talent codes and descriptions. Recall that the talent categories are Singing Dancing, Musical instrument, and Other. The class contains an auto-implemented property that holds a contestants name. The class contains fields for a talent code and description. The set accessor for the code assigns a code only if it is valid. Otherwise, it assigns I for Invalid. The talent description is a read-only property that is assigned a value when the code is set. Modify the GreenvilleRevenue program so that it uses the Contestant class and performs the following tasks: The program prompts the user for the number of contestants in this years competition; the number must be between 0 and 30. The program continues to prompt the user until a valid value is entered. The expected revenue is calculated and displayed. The revenue is $25 per contestant. The program prompts the user for names and talent codes for each contestant entered. Along with the prompt for a talent code, display a list of the valid categories. After data entry is complete, the program displays the valid talent categories and then continuously prompts the user for talent codes and displays the names of all contestants in the category. Appropriate messages are displayed if the entered code is not a character or a valid code.
At most, a class can contain ____________ method(S). 0 1 2 any number of
Chapter 10 defined the class circleType to implement the basic properties of a circle. (Add the function print to this class to output the radius, area, and circumference of a circle.) Now every cylinder has a base and height, where the base is a circle. Design a class cylinderType that can capture the properties of a cylinder and perform the usual operations on the cylinder. Derive this class from the class circleType designed in Chapter 10. Some of the operations that can be performed on a cylinder are as follows: calculate and print the volume, calculate and print the surface area, set the height, set the radius of the base, and set the center of the base. Also, write a program to test various operations on a cylinder.
Using classes, design an online address book to keep track of the names, addresses, phone numbers, and dates of birth of family members, close friends, and certain business associates. Your program should be able to handle a maximum of 500 entries. Define a class addressType that can store a street address, city, state, and ZIP code. Use the appropriate functions to print and store the address. Also, use constructors to automatically initialize the member variables. Define a class extPersonType using the class personType (as defined in Example 10-10, Chapter 10), the class dateType (as designed in this chapters Programming Exercise 2), and the class addressType. Add a member variable to this class to classify the person as a family member, friend, or business associate. Also, add a member variable to store the phone number. Add (or override) the functions to print and store the appropriate information. Use constructors to automatically initialize the member variables. Define the class addressBookType using the previously defined classes. An object of the type addressBookType should be able to process a maximum of 500 entries. The program should perform the following operations: Load the data into the address book from a disk. Sort the address book by last name. Search for a person by last name. Print the address, phone number, and date of birth (if it exists) of a given person. Print the names of the people whose birthdays are in a given month. Print the names of all the people between two last names. Depending on the users request, print the names of all family members, friends, or business associates.