Java Arrays

Consider the following code segment. Which of the following represents the contents of the array arr after the code segment is executed?

• {0, 1, 2, 3, 4, 5, 6}

• {1, 1, 1, 1, 1, 1, 1}

• {1, 1, 3, 3, 5, 5, 7}

• {1, 2, 3, 4, 5, 6, 7}

• {2, 2, 4, 4, 6, 6, 7}

Consider the following method. Which of the following code segments, if located in a method in the same class as changeIt, will cause the array myArray to contain {0, 5, 0, 0} ?

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Assume that an array of integer values has been declared as follows and has been initialized. Which of the following code segments correctly interchanges the value of  arr[0] and  arr[5] ?

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In the following code segment, assume that the string str has been properly declared and initialized. The code segment is intended to print the number of strings in the array animals that have str as a substring. The code segment does not work as intended. Which of the following changes should be made so the code segment works as intended?

• The Boolean expression in the for loop header should be changed to i < animals.length.

• The Boolean expression in the for loop header should be changed to i < animals.length - 1.

• The Boolean expression in the for loop header should be changed to i < animals[i].length.

• The condition in the if statement should be changed to animals[i].equals(str).

• The condition in the if statement should be changed to animals[i].substring(str).

Consider the code segment below, where arr is a one-dimensional array of integers. Which of the following code segments will produce the same output as the code segment above?

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Consider the following code segment, which is intended to print the sum of all elements of an array. A runtime error occurs when the code segment is executed. Which of the following changes should be made so that the code segment works as intended?

• The for loop header should be replaced with for (int k = 0; k < arr.length; k++).

• The for loop header should be replaced with for (int k = 0; k <= arr.length; k--).

• The for loop header should be replaced with for (int k = 1; k <= arr.length - 1; k++).

• The statement in the body of the for loop should be replaced with sum += arr[0].

• The statement in the body of the for loop should be replaced with sum += arr[k - 1].

The method countTarget below is intended to return the number of times the value target appears in the array arr. The method may not work as intended. Which of the following changes, if any, can be made to line 4 so that the method will work as intended?

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Consider the following method. Which of the following code segments, if any, can be used to replace the body of the method so that numbers will contain the same values?

• I only

• I and III only

• II and III only

• I, II, and III

• None of the code segments will return an equivalent result.

Consider the following two methods that appear within a single class. What is printed as a result of the call start()?

• 0 0 0 0 0 0

• 0 0 0 0 0 6

• 1 2 3 4 5 6

• 1 2 3 4 5 0

• changeIt will throw an exception.

Consider an integer array nums, which has been properly declared and initialized with one or more values. Which of the following code segments counts the number of negative values found in nums and stores the count in counter ?

• I only

• II only

• I and II only

• I and III only

• I and III only