question

A Java program is best classified as

answer

software

question

6 bits can be used to represent ________ distinct items or

answer

64

question

When executing a program, the processor reads each program instruction from

answer

main memory

question

Which memory capacity is the largest?

answer

12,000,000 megabytes

question

Binary numbers are composed entirely of

answer

0s and 1s

question

Volatility is a property of

answer

RAM

question

The ability to directly obtain a stored item by referencing its address is known as

answer

random access

question

Which phase of the fetch-decode-execute cycle might use a circuit in the arithmetic-logic unit?

answer

execute

question

In order for a computer to be accessible over a computer network, the computer needs its own

answer

network address

question

For a computer to communicate over the Internet, it must use

answer

the combined TCP/IP protocol

question

A URL (Universal Resource Locator) specifies the address of

answer

a document or other type of file on the Internet

question

It is important to dissect a problem into manageable pieces before trying to solve the problem because

answer

most problems are too complex to be solved as a single, large activity

question

Once we have implemented the solution, we are not done with the problem because

answer

1) the solution may not be the best (most efficient) 2) the solution may have errors and need testing and fixing before we are done 3)the solution may, at a later date, need revising to handle new specifications 4) the solution may, at a later date, need revising because of new programming language features

question

Java is an example of

answer

both high-level language and fourth generation language

question

In the following list, which statement is not true regarding Java as a programming language? 1) It is a relatively recent language, having been introduced in 1995 2) It is a language whose programs do not require translating into machine language before they are executed 3) It is an object-oriented programming language 4) It is a language that embraces the idea of writing programs to be executed using the World Wide Web 5) all of these are true

answer

It is a language whose programs do not require translating into machine language before they are executed

question

Comments should

answer

be insightful and explain what the instruction's intention is

question

The main method for a Java program is defined by

answer

public static main(String[ ] args)

question

The line of Java code "// System.out.println("Hello");" will

answer

do nothing

question

The instruction: System.out.println("Hello World"); might best be commented as

answer

// used to demonstrate an output message

question

Which character below is not allowed in an identifier? 1) $ 2) _ 3) 0 (zero) 4) q 5) ^

answer

^

question

Which of the following is not syntactically legal in Java? 1) public class Foo 2) System.out.println("Hi"); 3) { } 4) s t a t i c main(String[ ] args) 5) only System.out.println("Hi"); is legally valid, all of the rest are illegal

answer

4) s t a t i c main(String[ ] args)

question

Which of the following is a legal Java identifier? 1) i 2) class 3) ilikeclass! 4) idon'tlikeclass 5) i-like-class

answer

i

question

A unique aspect of Java that allows code compiled on one machine to be executed on a machine of a different hardware platform is Java's

answer

bytecodes

question

Java is similar in syntax to what other high level language?

answer

C++

question

An error in a program that results in the program outputting $100 instead of the correct answer, $250 is

answer

a logical error

question

Which of the following is true regarding Java syntax and semantics? 1) a Java compiler can determine if you have followed proper syntax but not proper semantics 2) a Java compiler can determine if you have followed proper semantics but not proper syntax 3) a Java compiler can determine if you have followed both proper syntax and semantics 4) a Java compiler cannot determine if you have followed either proper syntax or semantics 5) a Java compiler can determine if you have followed proper syntax and can determine if you have followed proper semantics if you follow the Java naming convention rules

answer

a Java compiler can determine if you have followed proper syntax but not proper semantics

question

Following Java naming convention, which of the following would be the best name for a class about store customers? 1) StoreCustomer 2) Store Customer 3) storeCustomer 4) STORE_CUSTOMER 5) Store-Customer

answer

StoreCustomer

question

Which of the following would be a good variable name for the current value of a stock? 1) curstoval 2) theCurrentValueOfThisStockIs 3) currentStockVal 4) csv 5) current

answer

currentStockVal

question

Which of the following is a legal Java identifier? 1) 1ForAll 2) oneForAll 3) one/4/all 4) 1_4_all 5) 1forall

answer

oneForAll

question

A color image is broken down into individual pixels (points), each of which is represented by

answer

3 values denoting the intensity of red, green, and blue in the image

question

Which of the following characters does not need to have an associated "closing" character in a Java program? 1) { 2) ( 3) [ 4) ; 5) all of these require closing characters

answer

;

question

Mistyping "println" as "printn" will result in

answer

a syntax error

question

________ is the physical aspect of the computer that can be seen.

answer

Hardware

question

________ is the brain of a computer.

answer

CPU

question

The speed of the CPU is measured in ________.

answer

megahertz gigahertz

question

Why do computers use zeros and ones?

answer

because digital devices have two stable states and it is natural to use one state for 0 and the other for 1.

question

One byte has ________ bits.

answer

8

question

Which of the following are storage devices? (Choose all that apply.) 1) floppy disk 2) hard disk 3) flash stick 4) CD-ROM

answer

floppy disk hard disk flash stick

question

________ is a device to connect a computer to a local area network (LAN).

answer

NIC

question

________ are instructions to the computer.

answer

Software Programs

question

Computer can execute the code in ________.

answer

machine language

question

________ translates high-level language program into machine language program.

answer

A compiler

question

________ is an operating system.

answer

Windows XP

question

________ is a program that runs on a computer to manage and control a computer's activities.

answer

Operating system

question

Java was developed by ________.

answer

Sun Microsystems

question

Java ________ can run from a Web browser.

answer

applets

question

________is an object-oriented programming language.

answer

Java C++

question

________is interpreted.

answer

Java

question

________is Architecture-Neutral.

answer

Java

question

________is a technical definition of the language that includes the syntax and semantics of the Java programming language.

answer

Java language specification

question

________ contains predefined classes and interfaces for developing Java programs.

answer

Java API

question

________ consists of a set of separate programs for developing and testing Java programs, each of which is invoked from a command line.

answer

Java JDK

question

________provides an integrated development environment (IDE) for rapidly developing Java programs. Editing, compiling, building, debugging, and online help are integrated in one graphical user interface.

answer

Java IDE

question

The main method header is written as:

answer

public static void main(String[ ] args)

question

Which of the following statements is correct? 1) Every line in a program must end with a semicolon. 2) Every statement in a program must end with a semicolon. 3) Every comment line must end with a semicolon. 4) Every method must end with a semicolon. 5) Every class must end with a semicolon.

answer

Every statement in a program must end with a semicolon.

question

Which of the following statements is correct to display Welcome to Java on the console? (Choose all that apply.) 1) System.out.println('Welcome to Java'); 2) System.out.println("Welcome to Java"); 3) System.println('Welcome to Java'); 4) System.out.print('Welcome to Java'); 5) System.out.print("Welcome to Java");

answer

System.out.println("Welcome to Java"); System.out.print("Welcome to Java");

question

The JDK command to compile a class in the file Test.java is

answer

javac Test.java

question

Which JDK command is correct to run a Java application in ByteCode.class?

answer

java ByteCode

question

Java compiler translates Java source code into ________.

answer

Java bytecode

question

________ is a software that interprets Java bytecode.

answer

Java virtual machine

question

Suppose you define a Java class as follows: public class Test{ } In order to compile this program, the source code should be stored in a file named

answer

Test.java

question

The extension name of a Java bytecode file is

answer

.class

question

The extension name of a Java source code file is

answer

.java

question

Which of the following lines is not a Java comment? (Choose all that apply.) 1) /** comments */ 2) // comments 3) -- comments 4) /* comments */ 5) ** comments **

answer

-- comments ** comments **

question

the reserved words

answer

public static void class

question

Every statement in Java ends with ________.

answer

a semicolon (;)

question

A block is enclosed inside ________.

answer

braces

question

The ________ method displays a message dialog box.

answer

JOptionPane.showMessageDialog(null, "Welcome to Java!", "Example 1.2 Output", JOptionPane.INFORMATION_MESSAGE); JOptionPane.showMessageDialog(null, "Welcome to Java!");

question

To use JOptionPane in your program, you may import it using:

answer

import javax.swing.JOptionPane; import javax.swing.*;

question

Consider the following statement: System.out.println("1 big bad wolft8 the 3 little pigsn4 dinnerr2night"); This statement will output ________ lines of text

answer

2

question

If you want to output the text "hi there", including the quote marks, which of the following could do that?

answer

System.out.println(""hi there"");

question

The word println is a(n)

answer

method

question

A Java variable is the name of a

answer

data value stored in memory that can change its value but cannot change its type during the program's execution

question

Of the following types, which one cannot store a numeric value? 1) int 2) byte 3) float 4) char 5) all of these can store numeric values

answer

char

question

What value will z have if we execute the following assignment statement? float z = 5 / 10;

answer

z will equal 0.0

question

A cast is required in which of the following situations? 1) using charAt to take an element of a String and store it in a char 2) storing an int in a float 3) storing a float in a double 4) storing a float in an int 5) all of these require casts

answer

storing a float in an int

question

If x is an int and y is a float, all of the following are legal except which assignment statement? 1) y = x; 2) x = y; 3) y = (float) x; 4) x = (int) y; 5) all of these are legal

answer

x = y;

question

Given the following assignment statement, which of the following answers is true regarding the order that the operators will be applied based on operator precedence? a = (b + c) * d / e - f;

answer

+, *, /, -

question

What will be the result of the following assignment statement? Assume b = 5 and c = 10. int a = b * (-c + 2) / 2;

answer

-20

question

is true regarding the mod operator, %

answer

It can be performed on any numeric values, and the result always is numeric

question

What is output with the statement System.out.println(x+y); if x and y are int values where x=10 and y=5?

answer

15

question

What is output with the statement System.out.println(""+x+y); if x and y are int values where x=10 and y=5?

answer

15

question

If you want to store into the String name the value "George Bush", you would do which statement?

answer

1) String name = "George Bush"; 2) String name = new String("George Bush"); 3) String name = "George" + " " + "Bush"; 4) String name = new String("George" + " " + "Bush");

question

Consider having three String variables a, b, and c. The statement c = a + b; also can be achieved by saying

answer

c = a.concat(b);

question

If the String major = "Computer Science", what is returned by major.charAt(1)?

answer

'o'

question

Which of the following would return the last character of the String x? 1) x.charAt(0); 2) x.charAt(last); 3) x.charAt(length(x)); 4) x.charAt(x.length( )-1); 5) x.charAt(x.length( ));

answer

x.charAt(x.length( )-1);

question

Suppose that String name = "Frank Zappa". What will the instruction name.toUpperCase( ).replace('A', 'I'); return?

answer

"FRINK ZIPPI"

question

Which library package would you import to use NumberFormat and DecimalFormat?

answer

java.text

question

Which library package would you import to use the class Random?

answer

java.util

question

The Random class has a method nextFloat( ) which returns a random float value between

answer

0 and 1

question

If you want to output a double so that at least 1 digit appears to the left side of the decimal point and exactly 1 digit appears to the right side of the decimal point, which pattern would you give a DecimalFormat variable when you instantiate it?

answer

"0.0"

question

Consider the double value likelihood = 0.013885. What would be output if DecimalFormat dformatter = DecimalFormat("0.00##"); and you execute System.out.println(df.format(likelihood)); ?

answer

0.0139

question

Using getCurrencyInstance( ) formats a variable, automatically inserting

answer

decimal point for cents dollar sign percent sign

question

What value will z have if we execute the following assignment statement? int z = 50 / 10.00;

answer

a run-time error arises because z is an int and 50 / 10.00 is not

question

Since you cannot take the square root of a negative number, you might use which of the following instructions to find the square root of the variable x?

answer

Math.sqrt(Math.abs(x));

question

Assume that x is a double that stores 0.362491. To output this value as 36%, you could use the NumberFormat class with NumberFormat nf = NumberFormat.getPercentInstance( ); Which of the following statements then would output x as 36%?

answer

System.out.println(nf.format(x));

question

If you want to draw a red circle inside of a green square in an applet where the paint method is passed a Graphics object called page, which of the following sets of commands might you use?

answer

page.setColor(Color.green); page.fillRect(50, 50, 100, 100); page.setColor(Color.red); page.fillOval(60, 60, 80, 80);

question

You specify the shape of an oval in a Java applet by defining the oval's

answer

bounding box

question

In order to create a constant, you would use which of the following Java reserved words?

answer

final

question

If a, b, and c are int variables with a = 5, b = 7, c = 12, then the statement int z = (a * b - c) / a; will result in z equal to

answer

4

question

Java is a strongly typed language. What is meant by "strongly typed"?

answer

Every variable has a single type associated with it throughout its existence in the program, and the variable can only store values of that type

question

As presented in the Software Failure, the root cause of the Mars Climate Orbiter problem was

answer

a communication issue between subsystems

question

Suppose a Scanner object is created as follows: Scanner input = new Scanner(System.in); What method do you use to read an int value?

answer

input.nextInt();

question

The following code fragment reads in two numbers: (Choose all that apply.) Scanner input = new Scanner(System.in); int i = input.nextInt(); double d = input.nextDouble(); What are the correct ways to enter these two numbers?

answer

Enter an integer, a space, a double value, and then the Enter key. Enter an integer, two spaces, a double value, and then the Enter key. Enter an integer, an Enter key, a double value, and then the Enter key.

question

Every letter in a Java keyword is in lowercase.

answer

true

question

Which of the following is a valid identifier? (Choose all that apply.) 1) $343 2) class 3) 9X 4) 8+9 5) radius

answer

$343 radius

question

Which of the following are correct names for variables according to Java naming conventions? (Choose all that apply.) 1) radius 2) Radius 3) RADIUS 4) findArea 5) FindArea

answer

1) radius 4) findArea

question

Which of the following are correct ways to declare variables? (Choose all that apply.) 1) int length; int width; 2) int length, width; 3) int length; width; 4) int length, int width;

answer

1) int length; int width; 2) int length, width;

question

________ is the Java assignment operator.

answer

=

question

To assign a value 1 to variable x, you write

answer

x = 1;

question

Which of the following assignment statements is incorrect? (Choose all that apply.) 1) i = j = k = 1; 2) i = 1; j = 1; k = 1; 3) i = 1 = j = 1 = k = 1; 4) i == j == k == 1;

answer

3) i = 1 = j = 1 = k = 1; 4) i == j == k == 1;

question

To declare a constant MAX_LENGTH inside a method with value 99.98, you write

answer

final double MAX_LENGTH = 99.98;

question

Which of the following is a constant, according to Java naming conventions? (Choose all that apply.) 1) MAX_VALUE 2) Test 3) read 4) ReadInt 5) COUNT

answer

MAX_VALUE COUNT

question

To improve readability and maintainability, you should declare ________ instead of using literal values such as 3.14159.

answer

constants

question

Which of these data types requires the most amount of memory? 1) long 2) int 3) short 4) byte

answer

long

question

To declare an int variable number with initial value 2, you write

answer

int number = 2;

question

What is the result of 45 / 4?

answer

11

question

Which of the following expressions will yield 0.5? (Choose all that apply.) 1) 1 / 2 2) 1.0 / 2 3) (double) (1 / 2) 4) (double) 1 / 2 5) 1 / 2.0

answer

1.0 / 2 (double) 1 / 2 1 / 2.0

question

Which of the following expression results in a value 1? 1) 2 % 1 2) 15 % 4 3) 25 % 5 4) 37 % 6

answer

37 % 6

question

24 % 5 is ________.

answer

4

question

-24 % 5 is ________.

answer

-4

question

-24 % -5 is ________.

answer

-4

question

To add a value 1 to variable x, you write (Choose all that apply.) 1) 1 + x = x; 2) x += 1; 3) x := 1; 4) x = x + 1; 5) x = 1 + x;

answer

x += 1; x = x + 1; x = 1 + x;

question

To add number to sum, you write (Note: Java is case-sensitive) (Choose all that apply.) 1) number += sum; 2) number = sum + number; 3) sum = Number + sum; 4) sum += number; 5) sum = sum + number;

answer

sum += number; sum = sum + number;

question

Suppose x is 1. What is x after x += 2?

answer

3

question

What is x after the following statements? int x = 1; int y = 2; x *= y + 1;

answer

x is 3

question

What is x after the following statements? int x = 1; x *= x + 1;

answer

x is 2

question

Math.pow(2, 3) returns ________.

answer

8.0

question

The ________ method returns a raised to the power of b.

answer

Math.pow(a, b)

question

To assign a double variable d to a float variable x, you write

answer

x = (float)d;

question

What is the printout of the following code: double x = 5.5; int y = (int)x; System.out.println("x is " + x + " and y is " + y);

answer

x is 5.5 and y is 5

question

Which of the following assignment statements is illegal? (Choose all that apply.) 1) float f = -34; 2) int t = 23; 3) short s = 10; 4) int t = (int)false; 5) int t = 4.5;

answer

int t = (int)false; int t = 4.5;

question

What is the value of (double)5/2?

answer

2.5

question

What is the value of (double)(5/2)?

answer

2.0

question

The expression (int)(76.0252175 * 100) / 100 evaluates to ________.

answer

76

question

If you attempt to add an int, a byte, a long, and a double, the result will be a ________ value.

answer

double

question

Which of the following is the correct expression of character 4?

answer

'4'

question

A Java character is stored in ________.

answer

two bytes

question

Suppose x is a char variable with a value 'b'. What is the printout of the statement System.out.println(++x)?

answer

c

question

Which of the following statement prints smithexam1test.txt?

answer

System.out.println("smithexam1test.txt");

question

Suppose i is an int type variable. Which of the following statements display the character whose Unicode is stored in variable i? 1) System.out.println(i); 2) System.out.println((char)i); 3) System.out.println((int)i); 4) System.out.println(i + " ");

answer

3) System.out.println((char)i);

question

The Unicode of 'a' is 97. What is the Unicode for 'c'?

answer

99

question

Will System.out.println((char)4) display 4?

answer

No

question

What is the printout of System.out.println('z' - 'a')?

answer

25

question

An int variable can hold ________. (Choose all that apply.) 1) 'x' 2) 120 3) 120.0 4) "x" 5) "120"

answer

'x' 120

question

Which of the following assignment statements is correct? (Choose all that apply.) 1) char c = 'd'; 2) char c = 100; 3) char c = "d"; 4) char c = "100";

answer

char c = 'd'; char c = 100;

question

The expression "Java " + 1 + 2 + 3 evaluates to ________.

answer

Java 123

question

Note that the Unicode for character A is 65. The expression "A" + 1 evaluates to ________.

answer

A1

question

Note that the Unicode for character A is 65. The expression 'A' + 1 evaluates to ________.

answer

66

question

The System.currentTimeMillis() returns ________.

answer

the current time in milliseconds since midnight, January 1, 1970 GMT (the Unix time)

question

Programming style is important, because ________. (Choose all that apply.) 1) a program may not compile if it has a bad style 2) good programming style can make a program run faster 3) good programming style makes a program more readable 4) good programming style helps reduce programming errors

answer

good programming style makes a program more readable good programming style helps reduce programming errors

question

According to Java naming convention, which of the following names can be variables? (Choose all that apply.) 1) FindArea 2) findArea 3) totalLength 4) TOTAL_LENGTH 5) class

answer

findArea totalLength

question

If a program compiles fine, but it produces incorrect result, then the program suffers ________.

answer

a logic error

question

The ________ method displays an input dialog for reading a string. (Choose all that apply.) 1) String string = JOptionPane.showMessageDialog(null, "Enter a string", "Input Demo", JOptionPane.QUESTION_MESSAGE); 2) String string = JOptionPane.showInputDialog(null, "Enter a string", "Input Demo", JOptionPane.QUESTION_MESSAGE); 3) String string = JOptionPane.showInputDialog("Enter a string", "Input Demo", JOptionPane.QUESTION_MESSAGE); 4) String string = JOptionPane.showInputDialog(null, "Enter a string"); 5) String string = JOptionPane.showInputDialog("Enter a string");

answer

2) String string = JOptionPane.showInputDialog(null, "Enter a string", "Input Demo", JOptionPane.QUESTION_MESSAGE); 4) String string = JOptionPane.showInputDialog(null, "Enter a string"); 5) String string = JOptionPane.showInputDialog("Enter a string");

question

The ________ method parses a string s to an int value.

answer

Integer.parseInt(s);

question

The ________ method parses a string s to a double value.

answer

Double.parseDouble(s);

question

In Java a variable may contain

answer

a value or a reference

question

If two variables contain aliases of the same object then

answer

answers the object may be modified using either alias and the object will become an "orphan" if both variables are set to null are correct

question

Which properties are true of String objects? 1) Their lengths never change 2) The shortest string has zero length 3) Individual characters within a String may be changed using the replace method 4) The index of the first character in a string is one 5) Only Their lengths never change and The shortest string has zero length are true

answer

Only Their lengths never change and The shortest string has zero length are true

question

What happens if you attempt to use a variable before it has been initialized?

answer

Answers A syntax error may be generated by the compiler and A runtime error may occur during execution are correct

question

What is the function of the dot operator?

answer

Both, It allows one to access the data within an object when given a reference to the object and It allows one to invoke a method within an object when given a reference to the object are correct

question

In Java, "instantiation" means

answer

creating a new object of the class

question

In the StringMutation program shown in Listing 3.1, if phrase is initialized to "Einstein" what will Mutation #3 yield if Mutation #1: mutation1 = phrase.concat(".")?

answer

XINSTXIN.

question

Say you write a program that makes use of the Random class, but you fail to include an import statement for java.util.Random (or java.util.*). What will happen when you attempt to compile and run your program.

answer

The program won't compile-you'll receive a syntax error about the missing class.

question

What will be displayed by this command: System.out.println(Math.pow(3, 3-1));

answer

9

question

An "alias" is when

answer

two different reference variables refer to the same physical object

question

The String class' compareTo method

answer

yields 0 if the two strings are identical

question

An API is

answer

an Application Programming Interface

question

The advantage(s) of the Random class' pseudo-random number generators, compared to the Math.random method, is that

answer

you may create several random number generators you can generate random ints, floats, and ints within a range you can initialize and reinitialize Random generators

question

Java.text's NumberFormat class includes methods that

answer

allow you to format currency, allow you to format percentages, round their display during the formatting process, but not truncate their display during the formatting process

question

The advantages of the DecimalFormat class compared with the NumberFormat class include

answer

only precise control over the number of digits to be displayed and control over the presence of a leading zero

question

Consider the following enumeration enum Speed { FAST, MEDIUM, SLOW };

answer

The name of the Speed enumeration whose ordinal value is zero is FAST

question

What is the advantage of putting an image in a JLabel instance?

answer

It becomes part of the component and is laid out automatically

question

What is the function of a frame's pack method?

answer

It sets the size appropriately for display

question

Layout managers are associated with

answer

containers

question

A containment hierarchy is

answer

a nested collection of relationships among containers

question

The main difference between a frame and a panel is

answer

frames can have a title bar; panels cannot

question

The Swing package

answer

is complementary to the AWT

question

Autoboxing is

answer

the automatic conversion of a wrapper object to/from its corresponding primitive type

question

In addition to their usage providing a mechanism to convert (to box) primitive data into objects, what else do the wrapper classes provide?

answer

static constants

question

A JPanel can be added to a JFrame to form a GUI. In order to place other GUI components such as JLabels and Buttons into the JFrame, which of the following messages is passed to the JPanel? 1) insert 2) include 3) get 4) getContentPane 5) add

answer

add

question

Which of the following GUI components is used to accept input into a JFrame? 1) JLabel 2) JPanel 3) JInput 4) JTextField 5) JInputField

answer

JTextField

question

JOptionPane is a class that provides GUI

answer

dialog boxes

question

The behavior of an object is defined by the object's

answer

methods

question

The relationship between a class and an object is best described as

answer

objects are instances of classes

question

To define a class that will represent a car, which of the following definitions is most appropriate? 1) private class car 2) public class car 3) public class Car 4) public class CAR 5) private class Car

answer

public class Car

question

Which of the following reserved words in Java is used to create an instance of a class? 1) class 2) public 3) public or private, either could be used 4) import 5) new

answer

new

question

In order to preserve encapsulation of an object, we would do all of the following except for which one?

answer

Make the class final

question

If a method does not have a return statement, then

answer

it must be a void method

question

Consider a sequence of method invocations as follows: main calls m1, m1 calls m2, m2 calls m3 and then m2 calls m4, m3 calls m5. If m4 has just terminated, what method will resume execution?

answer

m2

question

A variable whose scope is restricted to the method where it was declared is known as a(n)

answer

local variable

question

A class' constructor usually defines

answer

how an object is initialized

question

Having multiple class methods of the same name where each method has a different number of or type of parameters is known as

answer

method overloading

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Instance data for a Java class

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may be primitive types or objects

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An example of passing message to a String where the message has a String parameter would occur in which of the following messages? 1) length 2) substring 3) equals 4) toUpperCase 5) none of these, it is not possible to pass a String as a parameter in a message to a String

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equals

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Which of the following could be used to instantiate a new Student s1? 1) Student s1 = new Student( ); 2) s1 = new Student( ); 3) Student s1 = new Student("Jane Doe", "Computer Science", 3.333, 33); 4) new Student s1 = ("Jane Doe", "Computer Science", 3.333, 33); 5) new Student(s1);

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Student s1 = new Student("Jane Doe", "Computer Science", 3.333, 33);

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Consider a Rational class designed to represent rational numbers as a pair of int's, along with methods reduce (to reduce the rational to simplest form), gcd (to find the greatest common divisor of two int's), as well as methods for addition, subtraction, multiplication, and division. Why should the reduce and gcd methods be declared to be private.

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Because they will only be called from methods inside of Rational

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StringTokenizer is a class in the java.util library that can divide a String based on some delimiter String (a delimiter is a separator). If the instruction StringTokener st = new StringTokenizer(str, "&&"); is executed, where str is some String, then st divides up str into separate Strings whenever

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two ampersands are found

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Which of the following Applet methods is called automatically when the applet is first loaded? 1) Applet (the Applet's constructor) 2) init 3) start 4) getCodeBase 5) getImage

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init

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Consider a method defined with the header: public void foo(int a, int b). Which of the following method calls is legal? 1) foo(0, 0.1); 2) foo(0 / 1, 2 * 3); 3) foo(0); 4) foo( ); 5) foo(1 + 2, 3 * 0.1);

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foo(0 / 1, 2 * 3);

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Consider a method defined with the header: public void doublefoo(double x). Which of the following method calls is legal? 1) doublefoo(0); 2) doublefoo(0.555); 3) doublefoo(0.1 + 0.2); 4) doublefoo(0.1, 0.2); 5) all of these are legal except for doublefoo(0.1, 0.2);

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all of these are legal except for doublefoo(0.1, 0.2);

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In a UML diagram for a class

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classes are represented as rectangles there may be a section containing the name of the class there may be a section containing the attributes (data) of the class there may be a section containing the methods of the class

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Visibility modifiers include

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public, private, protected

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The expressions that are passed to a method in an invocation are called

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actual parameters

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What are the objects needed in order to create a Java GUI (graphical user interface)? 1) components 2) events 3) listeners 4) all of these 5) only classes from AWT and/or Swing are needed

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all of these

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What happens if you declare a class constructor to have a void return type?

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You'll likely receive a syntax error

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The software failure at the Denver International Airport's baggage handling system is a good example of 1) how a large system can be obsolete by the time it is developed 2) how designers sometimes have too much faith in the technology they are using 3) how failures are often a result of multiple variables caused by a system as a whole in actual operation 4) how the use of a centralized computer is really unrealistic in today's distributed processing 5) all of these

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all of these

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