FRQ Pop Quiz

There is a method called initializeKeyPad() that takes in a 2D array and will initialize the 2D array to represent a numerical keypad:

1 2 3 4 5 6 7 8 9 0

The method will also print the numeric pad upside-down, like this:

0 7 8 9 4 5 6 1 2 3

There is another method called reverseArray() that generates an integer array containing the numbers from 1 to 10 in descending order. Print the array twice as initialized and reversed, like this:

10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10

There is final method called intializeRandomList() that takes in the parameters n (integer), asciiStart (integer), and x (integer). The method should generate n random integers between 0 and 32 and add them to the asciiStart character to obtain random characters. These characters should be added to an ArrayList and returned.

Write the methods initializeKeyPad(int[][] arr), reverseArray(), and initializeRandomList().

public class Methods {
    public static void initializeKeyPad(int[][] arr) {
        for (int i = 0; i < arr.length; i++) {
          for (int j = 0; j < arr[0].length; j++) {
            arr[i][j] = i * 3 + j + 1;
          }
        }
    
        arr[arr.length - 1][arr[0].length - 1] = 0;
    
        for (int i = arr.length - 2; i >= 0; i--) {
          for (int j = arr[0].length - 1; j >= 0; j--) {
            System.out.print(arr[i][j] + " ");
          }
          System.out.println();
        }
    
        arr[arr.length - 1][0] = 0;
      }
    }
  
    public static int[] reverseArray() {
      int[] arr = new int[10];
      for (int i = 0; i < arr.length; i++) {
        arr[i] = i + 1;
      }
  
      for (int i = 0; i < arr.length / 2; i++) {
        int temp = arr[i];
        arr[i] = arr[arr.length - i - 1];
        arr[arr.length - i - 1] = temp;
      }
  
      return arr;
    }
  
    public static ArrayList<Character> initializeRandomList(int n, int asciiStart, int x) {
      ArrayList<Character> randomList = new ArrayList<>();
        Random randomGenerator = new Random(x);
  
      for (int i = 0; i < n; i++) {
        randomList.add((char) (randomGenerator.nextInt(33) + asciiStart));
      }
  
      return randomList;
    }

int[][] arr = new int[4][3];
Methods.initializeKeyPad(arr);
int[] reversedArray = Methods.reverseArray();
ArrayList<Character> randomList = Methods.initializeRandomList(10, 65, 12345);

9 8 7 
6 5 4 
3 2 1 

|   int[] reversedArray = Methods.reverseArray();

cannot find symbol

  symbol:   method reverseArray()

FRQ Pop Quiz • 6 min read

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