Ch 3

Front 1

The identifier of the object is called the _____.

Back 1

object reference

Front 2

Creating an object of a class is called _____, and the object is called an _____

Back 2

instantiating an object

instance of the class.

Front 3

The data associated with an object of a class are called _____, or _____.

Back 3

instance variables

fields

Front 4

The operations for a class is called _____.

Back 4

methods

Front 5

Invoking a method on an object is called _____.

Back 5

calling the method

Front 6

The fields and methods of a class are called its _____.

Back 6

members

Front 7

We say that the data is private to the class. In other words, the class _____ the data and the methods provide the only interface for setting or changing the data values.

Back 7

encapsulates

Front 8

How to instantiate objects and how to call the class methods

Back 8

Application Programming Interface (API)

Front 9

A special method of the class.

The job of the _____ is to assign initial values to the data of the class.

Back 9

Constructor

Front 10

Class code is already written and tested
New applications can be built faster
The applications will be more reliable

These explains _____.

Back 10

Reusability

Front 11

The _____ consists of a comma-separated list of initial data values to assign to the object.

Back 11

argument list

Front 12

_____'s argument is empty. This constructor assigns default values to all data in the object.

Back 12

Default constructor

Front 13

_____ is so-called "get " methods and return the current values of object data.

Back 13

Accessor methods

Front 14

_____ is so-called "set" methods and change the values of object data.

Back 14

Mutator methods

Front 15

The _____ is used in an expression. When the expression is evaluated, this replaces the method call.

Back 15

method returns a value

Front 16

Declare a variable named myMenu suitable for holding references to Menu Objects.

Back 16

Menu myMenu;

Front 17

Declare a reference variable of type File named myFile.

Back 17

File myFile

Front 18

Suppose a reference variable of type String called myString has already been declared. Create an object of type String and assign it to the reference variable myString.

Back 18

String myString2 = new String();

myString = myString2;

Front 19

Suppose a reference variable of type File called myFile has already been declared. Create an object of type File with the initial file name input.dat and assign it to the reference variable myFile.

Back 19

myFile = new File("input.dat");

Front 20

Suppose a reference variable of type Double called myDouble has already been declared. There is also a double variable x that has been declared an initialized. Create and object of type Double with the initial value of x and assign it to the refence variable myDouble.

Back 20

Double myDouble2 = new Double(x);

myDouble = myDouble2;

Front 21

One of the constructors for PrintStream class has a single OutputStream argument. Assume that dos is a variable that references an OutputStream object. Create a PrintStream object using dos and assign the resulting reference to ps, a PrintStream variable that has already been declared.

Back 21

ps = new PrintStream(dos);

Front 22

Assume that arithmetic is a reference to an object that has a method named add, that accepts two int arguments and returns their sum. Two int variables, euroSales and asiaSales have already been declared and initialized. Another int variable, eurasiaSales, has already been declared. Write a statement that calls add to compute the sum of euroSales and asiaSales and that stores this value in eurasiaSales.

Back 22

eurasiaSales = arithmetic.add(euroSales, asiaSales);

Front 23

Assume that dateManager is a reference to an object that has a method named printTodaysDate, that accepts no arguments and returns no value. Write a statement that calls printTodaysDate.

Back 23

dateManager.printTodaysDate();

Front 24

Assume that dataTransmitter is a variable that refers to an object that provides a method, named sendObject. There is one argument for this method, a reference to a Customer object. Assume that there is a reference to an object of type Customer, in a variable called john_doe. Invoke the method, using this reference as your argument.

Back 24

dataTransmitter.sendObject(john_doe);

Front 25

21141: Assume that dataTransmitter is a variable that refers to an object that provides a method, named sendNumber. There is one int arugment for this method. Invoke this method and use the number 5 as an argument.

Back 25

dataTransmitter.sendNumber(5);

Front 26

21145: Assume that dataTransmitter is a variable that refers to an object that provides a method , named sendTwo . There are two arguments for this method : a double and an int . Invoke the method with the double value of 15.955 and the int valueof 133 .

Back 26

dataTransmitter.sendTwo(15.955, 133);

Front 27

Assume there is a class AirConditioner that supports the following behaviors : turning the air conditioner on and off. The following methods are provide this behavior : turnOn and turnOff . Both methods take no arguments and return no value .
Assume there is a reference variable myAC to an object of this class , which has already been created. Using the reference variable , invoke a method to tell the air conditioner object to turn on.

Back 27

myAC.turnOn();

Front 28

20817: Assume that the String variable named text has already been declared. Assign to it the empty string.

Back 28

text = "";

Front 29

20950: Declare a String variable named oneSpace, and initizlie it to a String consisting of a single space.

Back 29

String oneSpace = new String (" ");

Front 30

20815: Write the declaration of two String variables named background and selectionColor and initialize them to “white” and “blue” respectively.

Back 30

String background = new String ("white");
String selectionColor = new String ("blue");

Front 31

20820: Given a String variable address , write a String expression consisting of the string "http://" concatenated with the variable 's String value . So, if the variable refers to "www.turingscraft.com", the value of the expression would be "http://www.turingscraft.com".

Back 31

"http://" + address

Front 32

20963: Given a String variable word, write a String expression that parenthesizes the value of word. So, if word contains “sadly”, the value of the expression would be the String “(sadly)”

Back 32

"(" + word + ")"

Front 33

20850: Given four int variables that have been declared and given values, octet1, octet2, octet3, and octet4, write a String expression whose value is the String equivalent of each of these variables joined by a single period(.)

Back 33

octet1 + "." + octet2 + "." + octet3 + "." + octet4

Front 34

20819: Given a String variable named sentence that has been initialized , write an expression whose value is the number of characters in the String referred to by sentence.

Back 34

sentence.length()

Front 35

20818: Write an expression whose value is the number of characters in the following String: "CRAZY!\n\\\t\\\\\\\\\\n. . . .\\\\\r\007'\\'\"TOOMUCH!"

Back 35

"CRAZY!\n\\\t\\\\\\\\\\n. . . .\\ \\\r\007'\\'\"TOOMUCH!".length()

Front 36

20810: Given the String variable str, write an expression that evaluates to the character at index 0 of str.

Back 36

str.charAt(0)

Front 37

20822: Assume that name is a variable of type String that has been assigned a value. Write an expression whose value is the first character of the value of name. So if the value of name were “Smith” the expression’s value would be ‘S’.

Back 37

name.charAt(0)

Front 38

20811: Given the String variable name, write an expression that evaluates to the third character of name.

Back 38

name.charAt(2)

Front 39

20871: Given a String variable named sentence that has been initialized, write an expression whose value is the index of the very last character in the String referred to by sentence.

Back 39

sentence.length() - 1

Front 40

20952: Assume that name is a variable of type String that has been assigned a value. Write an expression whose value is the last character of the value of name. So if the value of name were “Blair” the expression’s value would be ‘r’.

Back 40

name.charAt(name.length() - 1)

Front 41

20876: Assume that word is a variable of type String that has been assigned a value. Write an expression whose value is a String consisting of the first three characters of the value of word.

Back 41

word.substring(0,3)

Front 42

20878: Assume that name is a variable of type String that has been assigned a value. Write an expression whose value is a String containing the second character of the value of name.

Back 42

name.substring(1,2)

Front 43

20879: Write an expression that results in a String consisting of the third through tenth characters of the String s.

Back 43

s.substring(2,10)

Front 44

20880: Assume that name is a variable of type String that has been assigned a value. Write an expression whose value is a String containing the last character of the value of name.

Back 44

name.substring(name.length() - 1,name.length())

Front 45

20874: Assume that word is a variable of type String that has been assigned a value. Write an expression whose value is a String consisting of the last three characters of the value of word.

Back 45

word.substring(word.length()-3,word.length())

Front 46

20875: Given the String variable address, write an expression that returns the position of the first occurrence of the String “Avenue” in address.

Back 46

address.indexOf("Avenue")

Front 47

Assume that sentence is a variable of type String that has been assigned a value. Assume furthermore that this value is a String consisting of words separated by single space characters with a period at the end. Assume that there is another variable declared, firstWord, also of type String. Write the statements needed so that the first word of the value of sentence is assigned to firstWord.

Back 47

firstWord = sentence.substring(0,sentence.indexOf(' '));

Front 48

20884: Assume that sentence is a variable of type String that has been assigned a value. Assume furthermore that this value is a String consisting of words separated by single space characters with a period at the end. For example: “This is a possible value of sentence.” Assume that there is another variable declared, secondWord, also of type String. Write the statements needed so that the second word of the value of sentence is assigned to secondWord. So, if the value of sentence were “Broccoli is delicious.” your code would assign the value “is” to secondWord.

Back 48

int start = sentence.indexOf(" ") + 1;

int end = sentence.indexOf(" ", start+1);

secondWord = sentence.substring(start,end);

Front 49

20883: Write a sequence of statements that finds the first comma in the String line, and assigns to the variable clause the portion of line up to, but not including the comma. You may assume that an int variable pos, as well as the variables line and clause, have already been declared.

Back 49

pos = line.indexOf(',');
clause = line.substring(0,pos);

Front 50

20969: Write a statement that reads a word from standard input into firstWord. Assume that firstWord has already been declared as a String variable. Assume also that stdin is a variable that references a Scanner object associated with standard input.

Back 50

firstWord = stdin.next();

Front 51

20971: Assume that name has been declared suitably for storing names (like “Misha”, “Emily” and “Sofia”). Assume also that stdin is a variable that references a Scanner object associated with standard input. Write some code that reads a value into name then prints the message “Greetings, NAME” on a line by itself, where NAME is replace the value that was read into name.

Back 51

name = stdin.next();

System.out.println("Greetings, " + name);

Front 52

20606: Given an int variable datum that has already been declared, write a few statements that read an integer value from standard input into this variable.

Back 52

Scanner stdin = new Scanner( System.in);

datum = stdin.nextInt();

Front 53

21152: Assume the availability of class name IMath that provides a static method, toThePowerOf is a method that accepts two int arguments and returns the value of the first parameter raised to the power of the second. An int variable cubeSide has already been declared and initialized. Another int variable, cubeVolume, has already been declared. Write a statement that calls toThePowerOf to compute the value of cubeSide raised to the power of 3 and that stores this value in cubeVolume.

Back 53

cubeVolume = IMath.toThePowerOf(cubeSide, 3);

Front 54

21010: The area of a square is stored in a double variable named area. Write an expression whose value is length of one side of the square.

Back 54

Math.sqrt(area)

Front 55

21011: The area of a square is stored in a double variable named area. Write an expression whose value is length of the diagonal of the square.

Back 55

Math.sqrt(area*2)

Front 56

Write an expression whose value is the largest of population1, population2, population3, and poplation4 by calling max.

Back 56

Math.max(Math.max(population1,population2),Math.max(population3,population4))

Front 57

20587: Suppose a reference variable of type Double called myDouble is already declared. Create an object of type Double with the initial value of 1.5 and assign it to the reference variable myDouble.

Back 57

myDouble = new Double(1.5);

Front 58

The _____ class allows non-GUI applications to interact with users using dialog boxes.

Back 58

JOptionPane

Front 59

The JOptionPane method that gets input from the user is

Back 59

showInputDialog

Front 60

Data returned by JOptionPane is always of the _____ type (excluding yes-or-no questions).

Back 60

String