JavaP2 Unit 2 Data Structures Quiz

Which of the following arrays has a length of 5?

• double[] arr = new double[6];

• double[] arr = {0, 1, 2, 3, 4, 5};

• double[] arr = new double[]{1, 2.3, 4, 5};

• None of the above

Which of the following are valid arrays?

• I only

• II only

• III only

• I and II

• I and III

What is the output of the following program?

• hel

• hello

• hellow

• Error

• None of the above

When run, which of the following yields the integer 5?

• int[] newArray = {5, 5, 5, 5, 5, 5};

  System.out.println(newArray.length);

• String pets[] = new String[5];

  System.out.println(pets.length());

• int[] anotherArray = {5, 10, 15, 20, 25};

  System.out.println(anotherArray[(anotherArray.length - 2)] - 15);

• String[] favoriteNumbers = {"5", "7", "12", "13", "5"};

  System.out.println(favoriteNumbers[favoriteNumbers[0]]);

• int[] greatArray = {5, 4, 3, 2, 1, 0};

  System.out.println(greatArray.get(0));

What values will the array contain after the following the code is run?

• {6, 5, 4, 3, 2, 1, 0, -1, -2, -3, -4}

• {1, -3, 3, -1, 5, 1, 7, 3, 9, 5, 11}

• {1, 3, 5, 7, 9, 7, 5, 3, 1, -1, -3}

• {-4, 1, -2, 3, -4, 5, -6, 7, -8, 9}

You are working at the frozen yogurt shop in the mall. Your boss asks you to count how many flavors have the word chocolate in their name. You begin going through the list of flavors, but quickly realize that their are over 9000 flavors to check! Luckily, your boss stored all of the different flavors in a Java Array named flavorArray on the company computer. Write a Java program to count the number of flavors that have chocolate in their name.

• 
• 
• 
• 

What value will be held in mysteryNumber when this code finishes running?

• 0

• 17

• 1

• 16

What will the Array gameBoard contain after this code runs?

• ["X", "O", "X", "O", "X", "O", "X", "O", "X"]

• ["X", "O", "O", "X", "O", "O", "X", "O", "O"]

• ["O", "X", "X", "O", "X", "X", "O", "X", "X"]

• ["O", "X", "O", "X", "O", "X", "O", "X", "O"]

What would be a correct way to instantiate this 2D array?

• int[][] table = {

  1, 0, 10, 0,

  3, 8, 38, 0

  };

• int[][] table = {

  {1, 0, 10, 0},

  {3, 8, 38, 0}

  };

• int[][] table = {

  {1}, {0}, {10}, {0},

  {3}, {8}, {38}, {0}

  };

• int[][] table = {

  "1, 0, 10, 0",

  "3, 8, 38, 0"

  };

• int[][] table = new int[1, 0, 10, 0][3, 8, 38, 0];

Which is the correct way to construct and assign a 2D array, with 8 rows and 10 columns, to the variable popcorn?

• int[8][10] popcorn;

• int[8][10] popcorn = new int[8][10];

• int[][] popcorn = new int[8][10];

• int[8][10] popcorn = new int[][];

• int[][] popcorn = new int[][](8, 10);