Adding more than 1 thing into a Java Array

May 1, 2022

For this program, I am supposed to add two different kinds of ‘mirrors’ (the forward and backward slashes represent mirrors in my game) which is ‘/’ and ‘\’. I have successfully added the first set of slashes into my maze array but I can’t seem to figure out how to add both of the different slashes at the same time.

public static void placeMirrors(){
    Scanner input = new Scanner(System.in);

    // Promopting user for how many mirrors they want
    System.out.print("\nHow many mirrors do you want in your maze?");
    System.out.print("The maximum number of mirrors you can have is 8. The minimum is 2.\n");
    int usersMirrors = input.nextInt();

    // Deploying mirrors randomly within the maze
    for (int i = 1; i <= usersMirrors;) {
        int x = (int)(Math.random() * numRows);
        int y = (int)(Math.random() * numCols);

        // *FIGURE OUT ADDING BOTH SETS AT ONCE THING*
        if((x >= 0 && x < numRows) && (y >= 0 && y < numCols) && (maze[x][y] == ".")) {
            maze[x][y] = "\\";
            i++;
        }
    }
    System.out.println("Mirrors placed.");
}

>Solution :

I think you just need to add a second if inside the loop. I assume you’re adding the "mirrors" in pairs.

// Deploying mirrors randomly within the maze
for (int i = 1; i <= usersMirrors;) {
    int x = (int)(Math.random() * numRows);
    int y = (int)(Math.random() * numCols);

    if((x >= 0 && x < numRows) && (y >= 0 && y < numCols) && (maze[x][y].equals( "." ) )) {
        maze[x][y] = "\\";
        i++;
    }

    x = (int)(Math.random() * numRows);
    y = (int)(Math.random() * numCols);

    if((x >= 0 && x < numRows) && (y >= 0 && y < numCols) && (maze[x][y].equals( "." ) )) {
        maze[x][y] = "/";
    }
}