JAVA练习题含答案-answer to practice 6
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Chapter 6
Arrays
Multiple Choice
1)The individual variables that together make up the array are referred to as:
(a)indexed variables
(b)subscripted variables
(c)elements of the array
(d)all of the above
Answer: D
2)What is the correct expression for accessing the 5th element in an array named colors?
(a)colors[3]
(b)colors[4]
(c)colors[5]
(d)colors[6]
Answer: B
3)Consider the following array:
What is the value of myArray[myArray[1] – myArray[0]]
(a)7
(b)9
(c)-3
(d)6
Answer: C
Copyright © 2006 Pearson Education Addison-Wesley. All rights reserved. 1
2 Walter Savitch •Absolute Java2/e: Chapter 6 Test Bank
4)The subscript of the first indexed variable in an array is:
(a)0
(b)1
(c)2
(d)3
Answer: A
5)The correct syntax for accessing the length of an array named Numbers is:
(a)Numbers.length()
(b)Numbers.length
(c)both A and B
(d)none of the above
Answer: B
6)An ArrayIndexOutOfBounds error is a:
(a)compiler error
(b)syntax error
(c)logic error
(d)all of the above
Answer: C
7)Which of the following initializer lists correctly initializes the indexed variables of an array named
myDoubles?
(a)double myDoubles[double] = {0.0, 1.0, 1.5, 2.0, 2.5};
(b)double myDoubles[5] = new double(0.0, 1.0, 1.5, 2.0, 2.5);
(c)double[] myDoubles = {0.0, 1.0, 1.5, 2.0, 2.5};
(d)array myDoubles[double] = {0.0, 1.0, 1.5, 2.0, 2.5};
Answer: C
8)The base type of an array may be all of the following but:
(a)string
(b)boolean
(c)long
(d)all of these may be a base type of an array.
Answer: D
9)The correct syntax for passing an array as an argument in a method is:
(a)a[]
(b)a()
(c)a
(d)a[0]..a[a.length]
Answer: C
Copyright © 2006 Pearson Education Addison-Wesley. All rights reserved.
Chapter 6 Arrays 3 10)Java provides a looping mechanism for objects of a collection. This looping mechanism is called a
__________ loop.
(a)While
(b)For
(c)For each
(d)All of the above
Answer: C
11) A _________ can occur if a programmer allows an accessor method to return a reference to an array
instance variable.
(a)short circuit
(b)privacy leak
(c)partially filled array
(d)syntax error
Answer: B
12) A ________ loop is a good way to step through the elements of an array and perform some program
action on each indexed variable.
(a)while
(b)do…while
(c)for
(d)all of the above
Answer: C
True/False
1)An array is a collection of variables all of the same type.
Answer:True
2)An array has only one public instance variable, which is named length.
Answer:True
3)An arrays length instance variables value can be changed by a program.
Answer:False
4)An array name references a memory address.
Answer:True
5)You can only use array indexed variables as arguments to methods.
Answer:False
Copyright © 2004 Addison-Wesley. All rights reserved.