What happens if a programmer does not create a constructor inside a class? Select one: a.Compiler provides a default constructor to avoid errors b.Objects can't be created c.Syntax error occurs d.Logical error occurs

What happens if a programmer does not create a constructor inside a class? Select one: a.Compiler provides a default constructor to avoid errors b.Objects can't be created c.Syntax error occurs d.Logical error occurs

EBK JAVA PROGRAMMING

9th Edition

ISBN:9781337671385

Author:FARRELL

Publisher:FARRELL

Chapter10: Introduction To Inheritance

Section: Chapter Questions

Problem 7RQ

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Which of the following does NOT apply to the strategy design pattern? It can change the behavior of a class at runtime It can eliminate conditional statements It can reduce the communication overhead between objects It provides an alternative to subclassing None of above
What indicates that a class definition is complete? A. The first line of code that is not indented. B. The classEnd statement. C. The defEnd statement. D. Nothing. Class definitions never end. How are instance variables within an object's method referenced? A. by attaching 'self' and a period before the instance variable's name B. by attaching the method name and a period before the name of the instance variable. C. by specifiying the instance variable's name D. by specifying the name of the class and the instance variable. Which of the following statements correctly shows the first line of a class definition for Rectangle? A. class Rectangle: B. def class Rectangle: C. class Rectangle(): D. class Rectangle(self):
not handwritten Which of the following are NOT true for a constructor? Select one: a. It does not return anything b. Every class must include an explicitly written constructor c. Every field in the class is initialized in the constructor. d. It must have the same name as the class
Choose the best option that will make data members of a class to be 'Read-Only' 1 Mark all data fields private, provide accessors and no mutators 2 Mark all data fields private, no accessors and no mutators 3 No accessor and no mutator methods 4 Mark all data fields as private and no accessor methods
Create a class Car with parameters companyName, color, maxSpeed (Not more than 150) andcategory. Use appropriate data types and access specifiers. Use default constructor to create objectsof cars. (JAVA)
Which of the following are NOT true for a constructor? Select one: a. It does not return anything b. Every class must include an explicitly written constructor c. Every field in the class is initialized in the constructor. d. It must have the same name as the class
ANSWER ONLY NO. 8 AND EXPLAIN Create a constructor named Exam that assigns "Good luck" to a previously declared String variable named message. Create an empty overloaded constructor for the Exam class with two (2) String parameters named period and level. Declare a double-type accessor named getPrice that returns the value of price. Declare a boolean-type accessor named isFinished that returns the value of status. Declare a class named Midterm that inherits from the class named Exam. Create three (3) class declarations to show multiple levels of inheritance. Use the classes named Exam, Midterm, and Essay. Create a constructor named Midterm that prints "Exam has started." using println(). Its first statement should be a call to a constructor in the parent class. Given the base class named Quiz and the derived class named Essay, write a statement to show inheritance between these classes.
a. Write a FractionDemo program that instantiates several Fraction objects and demonstrates that their methods work correctly. Create a Fraction class with fields that hold a whole number, a numerator, and a denominator. In addition: Create properties for each field. The set access or for the denominator should not allow a 0 value; the value defaults to 1. Add three constructors. One takes three parameters for a whole number, numerator, and denominator. Another accepts two parameters for the numerator and denominator; when this constructor is used, the whole number value is 0. The last constructor is parameterless; it sets the whole number and numerator to 0 and the denominator to 1. (After construction, Fractions do not have to be reduced to proper form. For example, even though 3/9 could be reduced to 1/3, your constructors do not have to perform this task.) Add a Reduce() method that reduces a Fraction if it is in improper form. For example, 2/4 should be reduced to 1/2. Add an operator+() method that adds two Fractions. To add two fractions, first eliminate any whole number part of the value. For example, 2 1/4 becomes 9/4 and 1 3/5 becomes 8/5. Find a common denominator and convert the fractions to it. For example, when adding 9/4 and 8/5, you can convert them to 45/20 and 32/20. Then you can add the numerators, giving 77/20. Finally, call the Reduce() method to reduce the result, restoring any whole number value so the fractional part of the number is less than 1. For example, 77/20 becomes 3 17/20. Include a function that returns a string that contains a Fraction in the usual display formatâ€”the whole number, a space, the numerator, a slash (D, and a denominator. When the whole number is 0, just the Fraction part of the value should be displayed (for example, 1/2 instead of 0 1/2). If the numerator is 0, just the whole number should be displayed (for example, 2 instead of 2 0/3). b. Add an operator*() method to the Fraction class created in Exercise 11a so that it correctly multiplies two Fractions. The result should be in proper, reduced format. Demonstrate that the method works correctly in a program named FractionDemo2. c. Write a program named FractionDem03 that includes an array of four Fractions. Prompt the user for values for each. Display every possible combination of addition results and every possible combination of multiplication results for each Fraction pair (that is, each type will have 16 results).
Create a constructor named Exam that assigns "Good luck" to a previously declared String variable named message. Create an empty overloaded constructor for the Exam class with two (2) String parameters named period and level. Declare a double-type accessor named getPrice that returns the value of price. Declare a boolean-type accessor named isFinished that returns the value of status. Declare a class named Midterm that inherits from the class named Exam. Create three (3) class declarations to show multiple levels of inheritance. Use the classes named Exam, Midterm, and Essay. Create a constructor named Midterm that prints "Exam has started." using println(). Its first statement should be a call to a constructor in the parent class. Given the base class named Quiz and the derived class named Essay, write a statement to show inheritance between these classes.
which of the following statements relating to information hiding in object-oriented programming is false? 1. Information hiding depends on the extensive use of global variable 2. Information hiding protects the value of variables from being changed inappropriately 3. Information hiding makes it easier for programmers to extend class without worrying about who may access the class properties/variable 4. Information hiding makes it easier for programmers to re-use classes without knowing the details of how they work internally.
Test your newly created subclasses inside the same TestComputer program you previouslycreated: create two new Laptops and two new Desktops with the data of your choice. UsetoString() method to show all data fields (including the data fields in the super class and sub class)Hint: Make sure to avoid redundancy in your code – no fields implemented in the Parent Classshould be repeated/reimplemented/redefined in children. package project2;class Desktop extends Computer { private int width; private int height; public Desktop() { super(); width = height = 0; } public Desktop(String manufacturer, String diskSize, String manufacturingDate, int numberOfCores, int width, int height) { super(manufacturer, diskSize, manufacturingDate, numberOfCores); this.width = width; this.height = height; } public int getWidth() { return width; } public int getHeight() { return height; } public void setWidth(int width) {…
Which of the following statements are true. In a child class, we use the keyword "super" to call a method in the parent class. It is good practice to override the Object equals methods for any class we write. It is good practice to override the toString method for any class we write Inheritance allows us to reuse code and save programming time. All of the above are true statements.