Emergency Pop Quiz

public class Keypad{
public static void initializeKeypad() {
    int[][] keypad = new int[4][3];
    int digit = 1;

    for (int row = 0; row < 4; row++) {
        for (int col = 0; col < 3; col++) {
            if (digit <= 9) {
                keypad[row][col] = digit++;
            } else {
                keypad[row][col] = 0; // For digit 0
            }
        }
    }

    // Print the keypad
    for (int row = 0; row < 4; row++) {
        for (int col = 0; col < 3; col++) {
            System.out.print(keypad[row][col] + " ");
        }
        System.out.println(); // Move to the next row
    }
}

public static void main(String[] args) {
    initializeKeypad();
}
}
Keypad.main(null)


1 2 3 
4 5 6 
7 8 9 
0 0 0 

import java.util.*;

public class Main {
    public static ArrayList<Integer> initializeRandomList(Integer n, Integer min, Integer max) {
        ArrayList<Integer> randList = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            int randomNum = (int) (Math.random() * (max - min + 1)) + min;
            randList.add(randomNum); // Use .add() to add elements to ArrayList
        }
        return randList;
    }

    public static void main(String[] args) {
        ArrayList<Integer> randomList = initializeRandomList(5, 2, 8);
        System.out.println(randomList);
    }
}
Main.main(null)

[3, 3, 2, 7, 4]

import java.util.*;

public class Main {
    public static ArrayList<Integer> reversedArray(ArrayList<Integer> n) {
        ArrayList<Integer> reverse = new ArrayList<>();
        for (int i = n.size() - 1; i >= 0; i--) {
            reverse.add(n.get(i));
        }
        return reverse;
    }

    public static void main(String[] args) {
        ArrayList<Integer> originalList = new ArrayList<>(Arrays.asList(1, 2, 3, 4, 5));

        ArrayList<Integer> reversedList = reversedArray(originalList);
        
        System.out.println("Original List:");
        System.out.println(originalList);
        
        System.out.println("Reversed List:");
        System.out.println(reversedList);
    }
}
Main.main(null)

Original List:
[1, 2, 3, 4, 5]
Reversed List:
[5, 4, 3, 2, 1]