Java FRQ Test • 3 min read

public class ReverseArray {
    public static void main(String[] args) {
        int[] arr = reverseArray();
        
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }

        for (int i = arr.length - 1; i >= 0; i--) {
            System.out.print(arr[i] + " ");
        }
    }

    public static int[] reverseArray() {
        int[] array = new int[10];
        for (int i = 0; i < 10; i++) {
            array[i] = 10 - i;
        }
        return array;
    }
}

ReverseArray.main(null)

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

public class NumericKeypad {

    public static void main(String[] args) {
        char[][] keypad = initializeKeypad();
        printUpsideDown(keypad);
    }

    public static char[][] initializeKeypad() {
        char[][] keypad = {
            {'1', '2', '3'},
            {'4', '5', '6'},
            {'7', '8', '9'},
            {'0'}
        };
        return keypad;
    }

    public static void printUpsideDown(char[][] keypad) {
        for (int i = keypad.length - 1; i >= 0; i--) {
            for (int j = 0; j < keypad[i].length; j++) {
                System.out.print(keypad[i][j] + " ");
            }
            System.out.println();
        }
    }
}

NumericKeypad.main(null)

0 
7 8 9 
4 5 6 
1 2 3