CS 232: Final
The import statement import java.util. ; imports the Scanner class and any other java.util classes as well.
*
The statement count _ 1; is identical in meaning to count = count + 1.
+=
______are pieces of information that are sent into, or passed to, a method, usually because the method requires the information to perform its task or carry out its purpose.
Arguments
A relational operator compares two items; an expression containing a comparison operator has a(n)______value.
Boolean
______variables are variables that are shared by every instantiation of a class.
Class
True or False: A variable comes into existence, or goes out of scope, when you declare it.
False
True or False: Each class you develop should only have one parameterized constructor.
False
True or False: If you create your own constructor, the automatically created constructor still exists.
False
True or False: In Java, if a class is public (that is, if you use the public access modifier before the class name), you must save the class in a file with exactly the same name and a .class extension.
False
True or False: In a Java if statement, the Boolean expression, such as (someVariable == 10), does not have to appear within parentheses.
False
True or False: Java will not promote types in a method call.
False
True or False: Object-oriented programming is a style of programming in which sets of operations are executed one after another in sequence.
False
True or False: String objects can be directly compared.
False
True or False: The cast type is the type to which all operands in an expression are converted so that they are compatible with each other.
False
True or False: The following code illustrates a valid condition to check whether your age is at least 21. if(age > 21)
False
True or False: Under some circumstances, the following println() statement will execute. if (payRate < 5.65 && payRate > 60) System.out.println("Error in pay rate");
False
True or False: When you declare variables in a class, you most often declare static instance variables.
False
True or False: When you use a loop within a loop, you should always think of the inner loop as the all-encompassing loop.
False
True or False: Within a looping structure, a floating-point expression is evaluated.
False
True or False: You can pass multiple arguments to a method by listing the arguments within the call to the method and separating them with colons.
False
True or False: You declare an array variable in the same way you declare any simple variable, but you insert a pair of curly brackets after the type.
False
True or False: if statements cannot be in a class's set method.
False
What is the value of the result in the following program code? char aChar = 'C'; Boolean result = Character.isWhitespace(aChar);
False
______True or False: Polymorphism refers to the hiding of data and methods within an object.
False
Which operator has the highest precedence?
Logical NOT
What is the fully qualified identifier of a method named displayName() declared within the Mailing class?
Mailing.displayName()
You use the______, which is written as the exclamation point ( ! ), to negate the result of any Boolean expression.
NOT operator
______if statements are particularly useful when two conditions must be met before some action is taken.
Nested
What is wrong with the following condition? Correct it. if (grade > 70 || grade <= 80)
The condition is true for every number. if (grade > 70 && grade <= 80)
True or False: A character that is a digit is represented in computer memory differently from a numeric value represented by the same digit.
True
True or False: A variable declaration is a statement that reserves a named memory location.
True
True or False: Expressing an is-a relationship is correct only when you refer to the object and the class in the proper order.
True
True or False: Just as you can block statements to depend on an if, you can also block statements to depend on an else.
True
True or False: The class String is defined in java.lang.String, which is automatically imported into every program you write.
True
True or False: The method declaration is the first line, or header, of a method.
True
True or False: The return type for a method can be any type used in Java.
True
True or False: Whether you decide to use a while, for, or do...while loop in an application, you can improve loop performance by making sure the loop does not include unnecessary operations or statements.
True
True or False: You are never required to use a switch structure; you can always achieve the same results with nested if statements.
True
True or False: You can change the length of a String in a StringBuilder object with the setLength() method.
True
True or False: You can write your own constructor method, and you often do so when you want to ensure that fields within classes are initialized to some appropriate default value.
True
______True or False: Not all classes have a main() method.
True
______casting forces a value of one data type to be used as a value of another type.
Type
A(n)______situation is one where the compiler cannot determine which version of a method to call.
ambiguous
______Stand-alone programs are called Java______.
applications
The______types are all variations of the integer type.
byte, short, and long
Given the following method declaration, write a valid method call. public static void calcArea(String roomName, int length, int width)
calcArea("Room 116", 23, 43);
In a switch statement,______is followed by one of the possible values for the test expression and a colon.
case
The______method requires an integer argument that indicates the position of the character that the method returns.
charAt()
Using a custom class as a class variable can be accomplished through______or______.
composition, nesting
The + sign in the following expression refers to the______operation. System.out.println("My age: " + ageVar);
concatenation
A variable or data field may be a(n)______; that is, it should not be changed during the execution of a program.
constant
The______is called when a class is instantiated.
constructor
An item's______describes the type of data that can be stored there, how much memory the item occupies, and what types of operations can be performed on the data.
data type
A(n)______structure involves choosing between alternative courses of action based on some value within a program.
decision
A(n)______constructor is one that requires no arguments.
default
A(n)______is a GUI object resembling a window in which you can place messages you want to display.
dialog box
The String class______method evaluates the contents of two String objects to determine if they are equivalent.
equals()
Public classes are accessible by all objects, which means that public classes can be ______, or used as a basis for any other class.
extended
A(n)______data type can hold floating-point values of up to six or seven significant digits of accuracy.
float
Strings and other objects that can't be changed are known as______.
immutable
A loop controlled by the user is a type of______loop because you don't know how many times it will eventually loop.
indefinite
The three elements within the for loop are used _____, ____, and ______ the control variable.
initialize, test, update
A(n)______dialog box asks a question and provides a text field in which the user can enter a response.
input
When you instantiate an object from a class, memory is reserved for each _______field in the class.
instance
______A(n)______of a class is an existing object of a class.
instance
The______method of the Character class returns true if the argument is a digit (0-9) and false otherwise.
isDigit()
To run the First application from the command line, you type______First.
java
To convert a String to an integer, you use the Integer class, which is part of ______ and is automatically imported into programs you write.
java.lang
To compile a file named First.java, you type______First.java and then press Enter.
javac
To write a definite loop, you initialize a(n)______, a variable whose value determines whether loop execution continues.
loop control variable
Combining loops to improve performance is referred to as______.
loop fusion
A(n)______is a program module that contains a series of statements that carry out a task.
method
31. Besides data, classes contain______.
methods
The______operator returns the remainder of integer division.
modulus or %
An inside block is______, or contained entirely within, the outside block.
nested
When loops are______, each pair contains an inner loop and an outer loop.
nested
To allocate the needed memory for a class object, you must use the______operator.
new
Writing______programs involves creating classes, creating objects from those classes, and creating applications.
object-oriented
When you combine mathematical operations in a single statement, you must understand______, or the rules for the order in which parts of a mathematical expression are evaluated.
operator order of precedence
You use arithmetic _______to perform calculations with values in your programs.
operators
When you______a Java method, you write multiple methods with a shared name.
overload
A(n)______, or a library of classes, is simply a folder that provides a convenient grouping of classes.
package
A method of the Double class is the______method, which takes a String argument and returns its double value.
parseDouble()
The do...while loop is a(n)______loop—one in which the loop control variable is tested after the loop body executes.
post-test
A while loop is a(n)______loop—one in which the loop control variable is tested before the loop body executes.
pretest
Data fields within a class typically use the access specifier.
private
Using a programming language, programmers write a series of______, similar to English sentences, to carry out the tasks they want the program to perform.
program statements
Programmers often use _______, a tool that helps them plan a program's logic by writing plain English statements.
pseudocode
A(n)______is a series of if statements that determine whether a value falls within a specified range.
range check
As an object, a String variable name is not a simple data type. It is a(n)______; that is, a variable that holds a memory address.
reference
A(n)______statement causes a value to be sent from a called method back to the calling method.
return
Programming statements written in a high-level programming language are called ______.
source code
A(n)______is an integer contained within square brackets that indicates one of an array's variables, or elements.
subscript
The______reference reduces ambiguity in a method by ensuring the compiler uses the class variable.
this
The AND operator is written as______.
two ampersands or &&
Line comments start with______.
two forward slashes (//)
The prefix and postfix increment operators are _____ operators because you use them with one value.
unary
Verifying user data through a loop is the definition of______.
validating data
A data item is constant when it cannot be changed while a program is running. A data item is______when it might change.
variable
A(n)______loop is one in which the loop-controlling Boolean expression is the first statement in the loop.
while
