Questions and Answers of Starting Out With Java From Control Structures

This javadoc tag is used to document a parameter variable. a. @parameterb. @paramc. @paramvard. @arg
Write a method named times Ten. The method should accept a double argument, and return a double value that is ten times the value of the argument.
In physics, an object that is in motion is said to have kinetic energy. The following formula can be used to determine a moving object’s kinetic energy: The variables in the formula are as
This statement causes a method to end and sends a value back to the statement that called the method.a. Endb. Sendc. Exitd. Return
Write a method named square that accepts an integer argument and returns the square of that argument.
Write a program that asks the user to enter a distance in meters. The program will then present the following menu of selections: 1. Convert to kilometers2. Convert to inches3. Convert to feet4.
This javadoc tag is used to document a method’s return value.a. @methodreturnb. @retc. @returnd. @returnval
Write a method named get Name that prompts the user to enter his or her first name, and then returns the user’s input.
True or False: You terminate a method header with a semicolon.
The profit from the sale of a stock can be calculated as follows: Profit = ((NS × SP) - SC) - ((NS × PP) + PC)Where NS is the number of shares, PP is the purchase price per share, PC is the
True or False: When passing an argument to a method, Java will automatically perform a widening conversion (convert the argument to a higher-ranking data type), if necessary.
True or False: When passing an argument to a method, Java will automatically perform a narrowing conversion (convert the argument to a lower-ranking data type), if necessary.
Suppose you want to deposit a certain amount of money into a savings account, and then leave it alone to draw interest for the next 10 years. At the end of 10 years, you would like to have $10,000 in
True or False: A parameter variable’s scope is the entire program that contains the method in which the parameter is declared.
True or False: When code in a method changes the value of a parameter, it also changes the value of the argument that was passed into the parameter.
You can use the following logic to determine whether a number is even or odd: if ((number % 2) == 0){ // The number is even.}else{ // The number is odd.}Write a program with a method
True or False: When an object, such as a String, is passed as an argument, it is actually a reference to the object that is passed.
True or False: The contents of a String object cannot be changed.
True or False: When passing multiple arguments to a method, the order in which the arguments are passed is not important.
Write a program that tests your ESP (extrasensory perception). The program should randomly select the name of a color from the following list of words: Red, Green, Blue, Orange, Yellow To
True or False: No two methods in the same program can have a local variable with the same name.
True or False: It is possible for one method to access a local variable that is declared in another method.
True or False: You must have a return statement in a value-returning method.
What does an object use its fields for?
This is a collection of programming statements that specify the fields and methods that a particular type of object may have.a. Classb. Methodc. Parameterd. Instance
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; }}
What is the difference between a class and an instance of a class?
Write a class named Employee that has the following fields: • Name. The name field references a String object that holds the employee’s name.• IdNumber. The idNumber is an int variable
What are an object’s methods?
A class is analogous to a(n) __________.a. Houseb. Blueprintc. Drafting tabled. Architect
Assume that the following method is a member of a class. Find the error.public void total(int value1, value2, value3){ return value1 + value2 + value3;}
A contractor uses a blueprint to build a set of identical houses. Are classes analogous to the blueprint or the houses?
How is a class like a blueprint?
An object is a(n) __________.a. Blueprintb. Primitive data typec. Variabled. Instance of a class
The following statement attempts to create a Rectangle object. Find the error. Rectangle box = new Rectangle;
Consider the following class declaration: public class Square{ private double sideLength; public double getArea() { return sideLength * sideLength; } public double
What is an accessor method? What is a mutator method?
Design a class that holds the following personal data: name, address, age, and phone number. Write appropriate accessor and mutator methods. Demonstrate the class by writing a program that creates
You have programs that create Scanner, Random, and PrintWriter objects. Where are the Scanner, Random, and PrintWriter classes?
This is a class member that holds data.a. Methodb. Instancec. Fieldd. Constructor
Find the error in the following class: public class TwoValues{ private int x, y; public TwoValues() { x = 0; } public TwoValues() { x = 0; y =
Look at the following description of a problem domain:The bank offers the following types of accounts to its customers: savings accounts, checking accounts, and money market accounts. Customers are
Is it a good idea to make fields private? Why or why not?
What does the new operator do?
This key word causes an object to be created in memory.a. Createb. Newc. Objectd. Construct
Find the error in the following class: public class FindTheError{ public int square(int number) { return number * number; } public double square(int
What values do reference variables hold?
This is a method that gets a value from a class’s field, but does not change it.a. Accessorb. Constructorc. Voidd. Mutator
What is the purpose of the new key word?
Design a TestScores class that has fields to hold three test scores. The class should have a constructor, accessor and mutator methods for the test score fields, and a method that returns the average
How is the relationship between an object and a reference variable similar to a kite and a spool of string?
This is a method that stores a value in a field or in some other way changes the value of a field.a. Accessorb. Constructorc. Voidd. Mutator
Assume a program named MailList.java is stored in the Data Base folder on your hard drive. The program creates objects of the Customer and Account classes. Describe the steps that the compiler goes
Write a Circle class that has the following fields: • Radius: a double• PI: a final double initialized with the value 3.14159The class should have the following methods: •
You hear someone make the following comment: “A blueprint is a design for a house. A carpenter can use the blueprint to build the house. If the carpenter wishes, he or she can build several
When the value of an item is dependent on other data, and that item is not updated when the other data is changed, what has the value become?a. Bitterb. Stalec. Asynchronousd. Moldy
Why are constructors useful for performing “start-up” operations?
In this chapter we used the metaphor of a kite attached to a spool of string to describe the relationship between an object and a reference variable. In this metaphor, does the kite represent an
This is a method that is automatically called when an instance of a class is created.a. Accessorb. Constructorc. Voidd. Mutator
Under what circumstances does Java automatically provide a default constructor for a class?
When a variable is said to reference an object, what is actually stored in the variable?
When a local variable has the same name as a field, the local variable’s name does this to the field’s name.a. Shadowsb. Complementsc. Deletesd. Merges with
What do you call a constructor that accepts no arguments?
For this assignment, you will write a program that lets the user play against the computer in a variation of the popular blackjack card game. In this variation of the game, two six-sided dice are
A string literal, such as "Joe", causes what type of object to be created?
This is automatically provided for a class if you do not write one yourself.a. Accessor methodb. Default instancec. Default constructord. Variable declaration
When the same name is used for two or more methods in the same class, how does Java tell them apart?
The following table lists the freezing and boiling points of several substances. Design a class that stores a temperature in a temperature field and has the appropriate accessor and mutator
Look at the UML diagram in Figure 6-17 and answer the following questions:a) What is the name of the class?b) What are the fields?c) What are the methods?d) What are the private members?e) What are
Two or more methods in a class may have the same name, as long as this is different.a. Their return valuesb. Their access specifierc. Their parameter listsd. Their memory address
Assume that limo is a variable that references an instance of the class shown in Figure 6-17. Write a statement that calls set Make and passes the argument "Cadillac".Figure 6-17. Car - make -
How does method overloading improve the usefulness of a class?
The process of matching a method call with the correct method is known as __________.a. Matchingb. Bindingc. Linkingd. Connecting
What does the key word new do?
A class’s responsibilities are __________.a. The objects created from the classb. Things the class knowsc. Actions the class performsd. Both b and c
Write a program that uses the Die class that was presented in this chapter to play a simple dice game between the computer and the user. The program should create two instances of the Die class (each
What is an accessor? What is a mutator?
True or False: The new operator creates an instance of a class.
On a roulette wheel, the pockets are numbered from 0 to 36. The colors of the pockets are as follows: • Pocket 0 is green.• For pockets 1 through 10, the odd numbered pockets are red and the
What is a stale data item?
Write a class named Coin. The Coin class should have the following field: • A String named sideUp. The sideUp field will hold either “heads” or “tails” indicating the side of the coin
Describe a programming problem that would require the use of an accumulator.
Write the header for a method named light Years. The method should return a long and have one long parameter variable: miles.
Write the header for a method named distance. The method should return a double and have two double parameter variables: rate and time.
Write the header for a method named days. The method should return an int and have three int parameter variables: years, months, and weeks.
Look at the following method header. What type of value does the method return? Public static double getValue(int a, float b, String c)
In Java, method arguments are passed by value. What does this mean?
Suppose a method named show Values accepts two int arguments. Which of the following method headers is written correctly?a) Public static void showValues()b) Public static void showValues(int num1,
What is the difference between an argument and a parameter?
Write a void method that displays your full name. The method should be named my Name.
Is the following line of code a method header or a method call? Public static void calcTotal()
Is the following line of code a method header or a method call? CalcTotal();
True or False: To calculate the total number of iterations of a nested loop, add the number of iterations of all the loops.
Assume x is an int variable, and rand references a Random object. What does the following statement do?x = rand.nextInt(100);
True or False: A variable may be defined in the initialization expression of the for loop.
Assume x is an int variable, and rand references a Random object. What does the following statement do?x = rand.nextInt();
Write a program that plays a simple dice game between the computer and the user. When the program runs, a loop should repeat 10 times. Each iteration of the loop should do the following: •
This type of method does not return a value. a. Nullb. Voidc. Emptyd. Anonymous
What is the difference between a void method and a value-returning method?
Assume x is a double variable, and rand references a Random object. What does the following statement do? x = rand.nextDouble();

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