FRQ Test • 2 min read

Initialize a Numberical Keypad

public static void initializedKeypad() {
    int[] keypad = {1, 2, 3, 4, 5, 6, 7, 8, 9, 0};

    for (int i = 0; i < keypad.length; i++) {
        System.out.print(keypad[i] + " ");
        if ((i+1) % 3 == 0) {
            System.out.println();
        }
    }
}

Reverse an Array

public static void reverseArray() {
    int[] lst = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

    for (int x = lst.length; x > 0; x--){
        System.out.print(x + " ");
    }

    for (int i = 1; i <= lst.length; i++ ) {
        System.out.print(i + " ");
    }
}

Initialize Random Integers in ArrayList using Math.Random

Main

public static void main(String[] args) {
    System.out.println("Keypad:");
    initializedKeypad();

    System.out.println("\nReversed Array:");
    reverseArray();

    System.out.println("\nRandom List:");
    ArrayList<Integer> randomList = initializedRandomList(5,2,8);
    System.out.println(randomList);
}
main(null);

Keypad:
1 2 3 
4 5 6 
7 8 9 
0 
Reversed Array:
10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10