Exam 7: Arrays and Array Lists

Consider the following code snippet: ArrayList<Integer> num1 = new ArrayList<Integer>(); Int data; Scanner in = new Scanner(System.in); For (int i = 0; i < 5; i++) { Data = in.nextInt(); Num1.add(data); If (data == 0 && num1.size() > 3) { Num1.remove(num1.size() - 1); } } System.out.println("size is : " + num1.size()); What is the output of the given code snippet if the user enters 1,2,0,0,1 as the input?

Which code snippet calculates the sum of all the even elements in an array values?

Which statement is true about the code snippet below? ArrayList<String> names = new ArrayList<String>(); Names.add("John"); Names.add("Jerry"); ArrayList<String> friends = new ArrayList<String>(names); Names.add("Harry");

Which statements are true regarding the differences between arrays and array lists? I. Arrays are better if the size of a collection will not change II. Array lists are more efficient than arrays III. Array lists are easier to use than arrays

Which one of the following statements is correct about the given code snippet? Int[] somearray = new int[6]; For (int i = 1; i < 6; i++) { Somearray[i] = i + 1; }

What will be printed by the statements below? Int[] values = { 10, 20, 30, 40}; For (int i = 1; i < values.length; i++) Values[i] = values[i - 1]; For (int i = 0; i < values.length; i++) System.out.print (values[i] + " ");

Consider the following code snippet in Java 6 or later: String[] data = { "abc", "def", "ghi", "jkl" }; String[] data2 = Arrays.copyOf(data, data.length - 1); What does the last element of data2 contain?

Assume the following variable has been declared and given a value as shown: Int[][] data = { {9, 17, -4, 21 }, {15, 24, 0, 9}, {6, 2, -56, 8}, }; Which is the value of data.length?

What is the output of the following code snippet? public static void main(String[] args) { String[] arr = { "aaa", "bbb", "ccc" }; Mystery(arr); System.out.println(arr[0] + " " + arr.length); } Public static void mystery(String[] arr) { Arr = new String[5]; Arr[0] = "ddd"; }

What is the output of the code snippet below? Int[][] numarray = { { 8, 7, 6 }, { 0, 0, 0 } }; System.out.print(numarray[0][0]); System.out.print(numarray[1][0]);

Consider the following 2-dimensional array. Select the statement that gives the number of columns in the third row. Int[][] counts = { { 0, 0, 1 }, { 0, 1, 1, 2 }, { 0, 0, 1, 4, 5 }, { 0, 2 } };

Which statements are true about the buffer overrun attack launched over the Internet in 1988? I. The buffer overrun exploited a program that was written in C running on the Unix operating system II. The Java programming language generates a run-time exception when buffer overrun occurs III. In recent years computer attacks have lessened

Assume the array of integers values has been created. Which condition must be used in the indicated area so the loop below will assign max the largest value in values? Int max = values[0]; For (int current = 1; current < values.length; current++) { If (/* Put condition here */) Max = values[current]; }

Your program needs to store an integer sequence of unknown length. Which of the following is most suitable to use?

Consider the following code snippet: String[] data = { "abc", "def", "ghi", "jkl" }; String [] data2; In Java 6 and later, which statement copies the data array to the data2 array?

Which one of the following statements is correct for displaying the value in the second row and the third column of a two-dimensional, size 3 by 4 array?

Which code snippet calculates the sum of all the elements in even positions in an array?

What is the value of the count variable after the execution of the given code snippet? ArrayList<Integer> num = new ArrayList<Integer>(); Num)add(1); Num)add(2); Num)add(1); Int count = 0; For (int i = 0; i < num.size(); i++) { If (num.get(i) % 2 == 0) { Count++; } }

Which statements about array algorithms are true? I. The array algorithms are building blocks for many programs that process arrays II. Java contains ready-made array algorithms for every problem situation III. It is inefficient to make multiple passes through an array if you can do everything in one pass

Consider the following line of code: Int[] somearray = new int[30]; Which one of the following options is a valid line of code for displaying the twenty-eighth element of somearray?