JAVA练习题含答案-answers to practice 2
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Multiple Choice
1)Which operator is used to concatenate two strings?
(a)+
(b)–
(c)*
(d)/
Answer: A (see page 35)
2)Which operator returns the remainder of integer division?
(a)%
(b)/
(c)*
(d)none of the above
Answer: A (see page 26)
3)What is the value of the variable c in the statements that follow?
String phrase = "Make hay while the sun is shining.";
char c = phrase.charAt(10);
(a)w
(b)h
(c)i
(d)None of the above
Answer: B (see page 40)
4)The escape sequence the represents the new-line character is:
(a)\r
(b)\t
(c)\n
(d)\\
Answer: C (see page 43)
5)The syntax that declares a Java named constant named SALES_TAX is:
(a)double SALES_TAX = 7.50;
(b)public double SALES_TAX = 7.50;
(c)public static double SALES_TAX = 7.50;
(d)public static final double SALES_TAX = 7.50;
Answer: D (see page 47)
6)In Java, a block comment is delimited by:
(a)*/ /*
(b)/* /*
(c)/* */
(d)*/ */
Answer: C (see page 50)
7)To mark a block comment for inclusion in the Javadoc documentation, the block must be
delimited by:
(a)/** */
(b)*/* */
(c)**/ /*
(d)**/ */
Answer: A (see page 50)
8)Valid arguments to the System.out object‟s println method include:
(a) “Anything with double quotes”
(b) String variables
(c) Variables of type int
(d) All of the above
Answer: D (see page 59)
9)Which statement or group of statements produces the output: Java programming is fun!
(a)System.out.print(Java programming);
System.out.print(is fun!);
(b)System.out.println(Java programming is fun!);
(c)System.out.println(“Java programming”);
System.out.println(“ is fun!”);
(d)System.out.print(“Java programming”)
System.out.println(“ is fun!”);
Answer: D (see page 60)
10)If a hyphen is added after the % in a format specifier, the output will be _________.
(a)Left justified
(b)Right justified
(c)Centered
(d)None of the above
Answer: A (see page 64)
11)The statement: System.out.printf("%6.2f", 597.7231); displays:
(a)597.723
(b)597.72
(c)000597.72
(d)None of the above
Answer: B (see page 64)
12)The Java method printf is based on the ________ language.
(a)Pascal
(b)C++
(c)C
(d)ADA
Answer: C (see page 67)
13)The class NumberFormat allows you to specify a constant representing which country‟s
currency format should be used. To use this constant you must import:
(a)java.util.Locale
(b)java.util.Currency
(c)java.util.Properties
(d)None of the above.
Answer: A (see page 71)
14)Standard code libraries in Java are called:
(a)Methods
(b)Classes
(c)Packages
(d)Statements
Answer: C (see page 72)
15)What Java package includes the class Scanner?
(a)awt
(b)swing
(c)io
(d)util
Answer: D (see page 78)