Starting Out with Java: Early Objects (6th Edition)
6th Edition
ISBN: 9780134462011
Author: Tony Gaddis
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 3, Problem 1FTE
Find the error in the following class:
public class MyClass
{
private int x;
private double y;
public void MyClass(int a, double b)
{
x = a;
y = b;
}
}
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
2. Consider the following class definitions:
public class BClass
}
private int x;
public void set(int a)
}
X a;
{
public void print()
}
System.out.print(x);
{
{
public class DClass extends BClass
}
private int y;
public void set(int a, int b)
}
//Postcondition: x =a; y=Db;
{
public void print( ) {.…}
a. Write the definition of the print method of DClass that overrides it.
b. Write the definition of the method set of the class DClass.
Find the error(s) in the following class definition:
public class TestClass
private int value1;
private int value2;
public void TestClass(int num1, int num2)
{
value1= num1;
value2 = num2;
}
Consider the following class:
public class theClass
{
private double value;
private string str;
public static int count;
public theClass ()
{
}
public theClass (double d, int, x, String s)
{
}
public void print()
{
}
public static void incrementCount()
{
}
}
a) How many members do class theClass have?
b) Compare the purpose of the two constructors.
c) Use the reference this to write the definition of a method print( )to output the value of the instance data members separated by commas.
d) Write a statement to create an object myClass of the class theClass and initialise the instance variables to 5, 10.75 and the string Class.
e) Write a definition (heading) for a copy constructor for the class.
Chapter 3 Solutions
Starting Out with Java: Early Objects (6th Edition)
Ch. 3.1 - In this chapter, we use the metaphor of a...Ch. 3.1 - Prob. 3.2CPCh. 3.1 - When a variable is said to reference an object,...Ch. 3.1 - A string literal, such as Joe, causes what type of...Ch. 3.1 - Prob. 3.5CPCh. 3.1 - Prob. 3.6CPCh. 3.1 - Prob. 3.7CPCh. 3.1 - Prob. 3.8CPCh. 3.1 - Prob. 3.9CPCh. 3.1 - What is a stale data item?
Ch. 3.3 - Assume that r1 and r2 are variables that reference...Ch. 3.4 - How is a constructor named?Ch. 3.4 - What is a constructors return type?Ch. 3.4 - Prob. 3.14CPCh. 3.8 - Prob. 3.15CPCh. 3.8 - When designing an object-oriented application, who...Ch. 3.8 - How do you identify the potential classes in a...Ch. 3.8 - What are a classs responsibilities?Ch. 3.8 - What two questions should you ask to determine a...Ch. 3.8 - Will all of a classs actions always be directly...Ch. 3 - This is a collection of programming statements...Ch. 3 - A class is analogous to a(n) _______. a. house b....Ch. 3 - An object is a(n) _____. a. blueprint b. attribute...Ch. 3 - This is a class member that holds data. a. method...Ch. 3 - This key word causes an object to be created in...Ch. 3 - This key word causes a value to be sent back from...Ch. 3 - This is a method that gets a value from a classs...Ch. 3 - This is a method that stores a value in a field or...Ch. 3 - When the value of an item is dependent on other...Ch. 3 - This is a method that is automatically called when...Ch. 3 - When a local variable has the same name as a...Ch. 3 - If you do not write a constructor for a class,...Ch. 3 - A classs responsibilities are __________. a. the...Ch. 3 - Prob. 14TFCh. 3 - True or False: When passing an argument to a...Ch. 3 - Prob. 16TFCh. 3 - True or False: Each instance of a class has its...Ch. 3 - True or False: When you write a constructor for a...Ch. 3 - True or False: To find the classes needed for an...Ch. 3 - Find the error in the following class: public...Ch. 3 - Prob. 2FTECh. 3 - The following statement attempts to create a...Ch. 3 - Design a class named Pet, which should have the...Ch. 3 - Look at the following partial class definition,...Ch. 3 - Look at the following description of a problem...Ch. 3 - What is the difference between a class and an...Ch. 3 - A contractor uses a blueprint to build a set of...Ch. 3 - What is an accessor method? What is a mutator...Ch. 3 - is it a good idea to make fields private? Why or...Ch. 3 - If a class has a private field, what has access to...Ch. 3 - Prob. 6SACh. 3 - Assume a program named MailList.java is stored in...Ch. 3 - Prob. 8SACh. 3 - Why are constructors useful for performing...Ch. 3 - Prob. 10SACh. 3 - What is the difference between an argument and a...Ch. 3 - Under what circumstances does Java automatically...Ch. 3 - What do you call a constructor that accepts no...Ch. 3 - Employee Class Write a class named Employee that...Ch. 3 - Car Class Write a class named Car that has the...Ch. 3 - Personal Information Class Design a class that...Ch. 3 - Temperature Class Write a Temperature class that...Ch. 3 - Retail Item Class Write a class named RetailItem...Ch. 3 - Payroll Class Design a Payroll class that has...Ch. 3 - TestScores Class Design a TestScores class that...Ch. 3 - Circle Class Write a Circle class that has the...Ch. 3 - Pet Class Design a class named Pet, which should...Ch. 3 - Patient Charges Write a class named Patient that...
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
What is an algorithm?
Starting Out With Visual Basic (7th Edition)
What does a comparator do?
Digital Fundamentals (11th Edition)
Calories from Fat and Carbohydrates A nutritionist who works for a fitness club helps members by evaluating the...
Starting Out with Programming Logic and Design (4th Edition)
Consider the following array: int [] a = new int[10]; What is the last index of a? What is the value of a.lengt...
Java: An Introduction to Problem Solving and Programming (7th Edition)
Turtle Graphics: STOP Sign In this chapter, you saw an example of a loop that draws an octagon Write a program ...
Starting Out with Python (4th Edition)
What are the advantages in implementing a language with a pure interpreter?
Concepts of Programming Languages (11th Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- Consider the following class definition: (8) class base { public: void setXYZ(int a, int b, int c) ; voidsetX ( int a ) ; int getX ()const{returnx; } void setY ( int b ); intgetY()const{returny; } int mystryNum () {return ( x &*#x00A0;y - z &*#x00A0;z) ;} void print () const; base () } base(int a, int b, int c); protected: void setz ( int c) { z= c; } void secret(); int z= 0; private: int x= 0; int y = 0; }; a. Which member functions of the class base are protected? b. Which member functions of the class base are inline? c. Write the statements that derive the class myclass from class base as a public inheritance. d. Determine which members of class base are private, protected, and public in class myclass.arrow_forwardclass first { public: void setX(); void print() const; protected: int y; void setY(int a); private: int x; }; Suppose that class second is derived from class first using the statement: class second: private first which members of class first are private, protected, and public in class second?arrow_forward2. Consider the following class definitions: public class BClass private int x; public void set(int a) { x = a; } public void print() System.out.print(x); } public class DClass extends BClass { private int y; public void set(int a, int b) //Postcondition: x =a; y=b; } public void print( ) {..} a. Write the definition of the print method of DClass that overrides it. b. Write the definition of the method set of the class DClass. ||arrow_forward
- public class date { private int day; // from 1 to 31 private int month; // from 1 to 12 private int year; // from 2000 upwards public void advance (); // move to next day }; Implement a constructor that initializes new objects of date class to be set to the 1st of January 2000. Implement setters for day, month, and year. Implement the advance method, which moves to the next day, ensuring that all data members are updated appropriately.arrow_forwardclass A{ void methodA(){} void methodB(); } class B extends A{ void methodA(){ } } class A should be abstract methodB should be abstract both a and b both classes are okayarrow_forwardConsider the following class definition: (8)class base{public:void setXYZ(int a, int b, int c);void setX(int a);int getX() const { return x; }void setY(int b);int getY() const { return y; }int mystryNum() { return (x * y - z * z); }void print() const;base() {}base(int a, int b, int c);protected:void setZ(int c) { z = c; }void secret();int z = 0;private:int x = 0;int y = 0;};a. Which member functions of the class base are protected?b. Which member functions of the class base are inline?c. Write the statements that derive the class myClass from classbase as a public inheritance.d. Determine which members of class base are private, protected,and public in class myClass.arrow_forward
- public class Father { public String name; public int age; // customer name Father(){ name=”Hassan”; age=50;} public void display(){ System.out.println(“Name:”+name); System.out.println(“Age:”+age); } } 1. Based on Figure 3, create a class named Child that inherits the Father class. Declare an instance name location (String) for class Child. 2. Define a constructor in class Child and give an appropriate initial values for the instance (name, age, location). 3. Define a method display () in class Child, execute the display ( ) method in superclass using the keyword super. Method display ( ) in class Child should print the information of name, age and location 4. Create other class named Main for the main method and create 2 objects for the 2 classes (Father and Child). Then execute the display ( ) method for Father and Child. Example of the output as in Figure 4: Father's info: Name: Josh Age: 50 Child's info: Name: Christy Age: 20 Location:…arrow_forward// Is my code correct? //please make it more efficient as you can. Thank you //please correct it if there is some mistakes public class PartTimeEmployee extends Person { //private variables private double payRate; private double hoursWorked; public PartTimeEmployee() { super(); /*invokes the default constructor of class Person */ payRate = 0; hoursWorked = 0; } public PartTimeEmployee(String idPerson, String nameFirst, String nameLast, String date, String addressPerson, double pay, double hours) { super(idPerson, nameFirst, nameLast, date, addressPerson); /*invokes the non-default constructor in other words, override the parameters from Person() non-defaukt with another set of parameters, example 'idPerson' variable overrides 'id' in Person() */ this.payRate = pay; this.hoursWorked = hours; } public String toString(String idPerson,…arrow_forwardTrue or False, An abstract class must have at least one abstract method.arrow_forward
- Determine if this statement is true or false Take the following method, which is defined in some class: class SomeClass: SomeBaseClass{ private int override MyMethod() { //do something.... } } This is an example of run time polymorphism, as MyMethod is being redefined in the child class by the override keyword.arrow_forwardQUESTION 15 public class numClass { private int a; private static int y = 10; public numClass(int newX) {a=newx; } public void set(int newx) { a=newx; y+=a; } public void setY(int newy) { y=newY; } public static int getY() { return y; } }// end of class public class output { public static void main(String[] args) { numClass one = new numClass(10); numClass two = new numClass (2); try{ one. sety(30); two.set(4); if(one.getY()==30) throw new Exception ("30"); one.setY(40); } catch (Exception e) { two.sety (50); } System.out.println(two.getY()); }// end of main } // end of classarrow_forwardIdentify the constructor for the following class class Teacher { int id; String name; } a. Teacher0 b. class) c. id() d. name()arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill EducationStarting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSONDigital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON
- C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSONDatabase Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage LearningProgrammable Logic ControllersComputer ScienceISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education
Database System Concepts
Computer Science
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:McGraw-Hill Education
Starting Out with Python (4th Edition)
Computer Science
ISBN:9780134444321
Author:Tony Gaddis
Publisher:PEARSON
Digital Fundamentals (11th Edition)
Computer Science
ISBN:9780132737968
Author:Thomas L. Floyd
Publisher:PEARSON
C How to Program (8th Edition)
Computer Science
ISBN:9780133976892
Author:Paul J. Deitel, Harvey Deitel
Publisher:PEARSON
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781337627900
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning
Programmable Logic Controllers
Computer Science
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education
Introduction to Classes and Objects - Part 1 (Data Structures & Algorithms #3); Author: CS Dojo;https://www.youtube.com/watch?v=8yjkWGRlUmY;License: Standard YouTube License, CC-BY