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rephactor questions - weeks 3-
which operator is used to perform string concatenation in Java - correct answer +
if a String variable called greeting contains the characters "hello" what does the following expression do:
greeting.toUpperCase() - correct answer returns a new string containing the characters "HELLO"
if a string variable called pioneer contains the characters "Grace Murray Hopper", what is the result of the following expression:
pioneer.length() - correct answer 19
given the following declaration which expression would extract the substring "ledge"
String words = "Knowledge is power."; - correct answer words.substring(4, 9);
what output would be produced when the following is executed: String state = "Mississippi";
System.out.println(state.replace("is", "was")); - correct answer Mwasswassippi
If a String variable called address contains the characters "123 Main Street", what is the result of the following expression:
address.indexOf('3') - correct answer 2
which statement would produce the following output?
"Oom Pah Pah Oom Pah Pah," that's how it goes. - correct answer System.out.println(""Oom Pah
Pah Oom Pah Pah," that's how it goes."); which of the following literals is NOT valid: a. '"' b. ""\n" c. ""\n""
d. '\n' - correct answer c. ""\n""
what is the output of the following statement:
System.out.println("He said "Avada Kedavra""); - correct answer He said "Avada Kedavra"
what is \t - correct answer a horizontal tab
what is \n - correct answer a newline character which sends the output to the next line
what do the characters in a Unicode escape sequence represent? - correct answer the hexadecimal
code for a particular Unicode character
a small character set containing primarily English characters and basic symbols - correct answer
ASCII
a way to represent non-ASCII Unicode characters in a program - correct answer Unicode escape
sequence
the technique of ordering characters based on a character set - correct answer lexicographic
ordering
the way characters are stored in memory - correct answer character encoding
characters that don't map to the fixed-width, 16-bit Unicode encoding - correct answer
supplementary characters
characters (like newline) that have no visual symbol - correct answer non-printable characters
the character set Java uses to represent characters - correct answer Unicode
A list of characters used by a programming language - correct answer character set
the String class is part of the java.__ package - correct answer lang
if (total > 8)
System.out.println("collywobbles"); - correct answer the word collywobbles is not printed and
processing continues what output is printed by the following code if it is executed when appetizer is 3 and entree is 12? if (appetizer > 1) if (entree < 7) System.out.println("ketchup"); else System.out.println("mustard"); else if (appetizer < 0) System.out.println("mayonnaise"); else
System.out.println("relish"); - correct answer mustard
the condition of an if statement must be a ____ expression - correct answer boolean
What is wrong with the following code: if (count > 5) if (sum < MAX) System.out.println("cattywampus"); else
System.out.println("snickersnee"); - correct answer the indentation does not properly reflect the
processing Of the options given, what values of the variables height, size, and width would cause the following code to set the variable weight to 100? if (height < size) { weight = 50; if (width < 20)
System.out.println("short"); } else { if (width > 100) weight = 100; System.out.println("tall"); } a. height = 15, size = 10, width = 110 b. height = 15, size = 25, width = 50 c. height = 20, size = 12, width = 90
d. height = 12, size = 20, width = 200 - correct answer a. height = 15, size = 10, width = 110
the result of a __ __ can be assigned to a boolean variable - correct answer relational operator
the ___ operators have a lower precedence than the ___ operators - correct answer relational;
arithmetic
the relational operators can/cannot be used to put String objects in alphabetical order - correct
answer cannot
the less than operator (<) can/cannot be used to compare floating-point values - correct answer
can
the not operator (!) requires ___ operand(s) - correct answer one
if A and B are both false, then A && B is ___ - correct answer false
if A is true and B is false, then A || B is ___ - correct answer true
the exclusive or operator (^) produces/does not produce results that are opposite to the regular or
operator (||) - correct answer does not produce
If the value of num is 7 and the value of max is 10 what is the value of num after the following statement is executed:
num = (max < num)? max : max - num; - correct answer 3
What does the following statement print:
System.out.println((count < 0)? "Invalid" : count); - correct answer the value of count, or "Invalid"
if count is negative
in the switch statement, the case values must be _____ - correct answer constants
in most cases, a switch statement relies on the ___ statement to terminate each case - correct
answer break
a while loop is based on a _____ condition - correct answer boolean
a special value used to indicate the end of the input is called - correct answer a sentinel value
the indexOf method of the String class returns a value of __ if the character is not found - correct
answer -
in the Palindrones program, the ___ ___ evaluates one string to see if it is a palindrome - correct
answer inner loop
the Java - ___ is a repetition statement, or loop, allowing you to execute a set of programming
statements multiple times - correct answer do-while statement
a value that is passed into a method when it is called - correct answer argument
defines the code that is executed when a method is called - correct answer method declaration
variables declared inside of a method body - correct answer local data
part of the method header that specifies the type of value the method produces - correct answer
return type
the statement used to return a value from a method - correct answer return statement
the name used to refer to a value passed into a method - correct answer formal parameter
the keyword used as the return type for a method that doesn't return a value - correct answer void
