How to use String toString?

Question

hey guys,
I've 2-D array and i would like to printout using String toString method. I'v used that method to printout non-array values but I really don't know how to display 2-D array using the String toString method. Can someone please help me? thanks in advance!

Answer 1

I do not understand your question. Please post
whatever code you have and indicate where you are
stuck.I'm sure you're aware of the String toString method which is often used to display the output in different classes without the main method.
I've following code:
public static int bingoCard [][] = new int[SIZE][SIZE]; 
public BingoCard()   {
        Integer ran = 0;
        for (i = 0; i < SIZE; i ++) {
             if (i == 0) {
                min = 1;
                max = 15;
            } else {
                min = max + 1;
                max += 15;
//             System.out.println("Min: " + min + " " + "Max: " + max);
            // generate all 15 balls in this range
            for (j = min; j <= max; j++) {
                bC.add(new Integer(j));               
//             // randomize the 15 balls           
            for (j = 0; j < SIZE; j++) {
                while (bingoCard[i][j] == 0) {
                    ran = (Integer)bC.removeRandom(); // get Integer object back
                    if (max <= 15 && (ran.intValue() >= 1 && ran.intValue() <= 15))
                        bingoCard[i][j] = ran.intValue();              
                    else if(max <= 30 && (ran.intValue() >= 16 && ran.intValue() <= 30))
                        bingoCard[i][j] = ran.intValue();           
                    else if(max <= 45 && (ran.intValue() >= 31 && ran.intValue() <= 45))
                        bingoCard[i][j] = ran.intValue();              
                    else if(max <= 60 && (ran.intValue() >= 46 && ran.intValue() <= 60))
                        bingoCard[i][j] = ran.intValue();             
                    else if(max <= 75 && (ran.intValue() >= 61 && ran.intValue() <= 75))
                        bingoCard[i][j] = ran.intValue();
//                 System.out.println("Numbers in the card: " +  bingoCard[i][j]);
        bingoCard[2][2] = 0;       
Now, i want to dipslay the bingoCard[][] using following method
public String toString () { // return that array } instead of using following method which displays it for now
public static void display () {
        for ( i = 0; i < SIZE; i++) {
             System.out.print(" "+ columnTitles[i] +"   ");
        System.out.println(); 
        for (i = 0; i < SIZE; i++) {  
            for (j = 0; j < SIZE; j++) {               
                System.out.print(" "+bingoCard[j] +" ");
if (bingoCard[j][i] < 10)
System.out.print(" ");
System.out.println();
Any help would be really apperciated. =]