Element of a Multidimensional Array, Java

Question

I have an array:

public String[][] bombBoard = new String[9][9];

This array is filled with values (*), however randomly throughout there are some other values (@).

Later in the program I want to tell the user how where the (@) is, if there are in the vicinity:

public void loadNumbers()
{
    try
    {
        if (bombBoard[bombRow][bombCol] == "@") 
        {
            System.out.println("You have landed on a bomb!");
            //break
        }
        else if (bombBoard[bombRow+1][bombCol].equals("@"))
        {
            System.out.println("There is a bomb in the vicinity!" + bombBoard[bombRow+1][bombCol]);
        }
        else if (bombBoard[bombRow-1][bombCol] == "@")
        {
            System.out.println("There is a bomb in the vicinity!" + bombBoard[bombRow-1][bombCol]);
        }
        else if (bombBoard[bombRow][bombCol+1] == "@")
        {
            System.out.println("There is a bomb in the vicinity!" + bombBoard[bombRow][bombCol+1]);
        }
        MORE CODE...
    }

}

It prints: "There is a bomb in the vicinity!@"

I want it to print "There is a bomb at 3, 2"

Probably so simple, but I'm drawing blanks. Instead of pulling back whats inside the element, I want the element index (I presume). Please halp!

Compare String values with String's equals method, not with the == operator. You did it correctly on the second condition. — rgettman
– rgettman, Commented Nov 14, 2013 at 19:47

Vivin Paliath · Accepted Answer · 2013-11-14 19:48:45Z

1

I assume you just want to print out the coordinates of the @? If so you can do it like this:

System.out.println("There is a bomb at " + bombRow + ", " + bombCol + 1);

Use the same pattern for the other conditions. Also, you want to compare strings using .equals instead of == (the latter only compares references).

answered Nov 14, 2013 at 19:48

Vivin Paliath

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3 Comments

RS3 Over a year ago

This worked with a slight modification (instead of bombCol + 1, I used (bombCol + 1)) since it wasn't doing Math without the parens! Thanks.

RS3 Over a year ago

I changed them all to == and it seems to work. How does .equals differ from == besides the obvious?

Vivin Paliath Over a year ago

@RichardS I assume it works because of string interning. .equals will compare the actual String's contents whereas == only checks to see if they point to the same thing.

Dylan Meeus · Accepted Answer · 2013-11-14 19:49:51Z

0

try

 System.out.println("There is a bomb in the vicinity!" + (bombRow+1).toString() +"," +bombCol.toString());

answered Nov 14, 2013 at 19:49

Dylan Meeus

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