Printing a 2d array in Java like a table

Question

I'd like to print an inputed 2-dimensional array like a table i.e if for some reason they put in all 1s...

Just like so above but in the console on Java eclipse, no fancy buttons and GUI's but in the console, here is what I have....

    import java.util.Scanner;
    public class Client {
        public static void main(String[] args){
            Scanner input = new Scanner(System.in);

            int[][] table = new int[4][4];
            for (int i=0; i < table.length; i++) {
                for (int j=0; j < table.length; j++) {
                    System.out.println("Enter a number.");
                    int x = input.nextInt();
                    table[i][j] = x;
                    System.out.print(table[i][j] + " "); 
                } 
                    System.out.println();
        }
        System.out.println(table);
    }
}

And this is what I get when I input everything and the console terminates:

Enter a number.

1

1 Enter a number.

1

1 Enter a number.

1

1 Enter a number.

1

1 

[[I@3fa1732d

Sorry but I couldn't find this anywhere if you could show me a question that asks how to print an array like so in the console then I won't question your downvote — Adam Calcanes, Jan 06 '14 at 22:16
Well then, thanks, It was probably the hyphen in the two-dimensional part of the title that threw off my search as I was also using 2d instead of two dimensional because it gave me more results — Adam Calcanes, Jan 06 '14 at 22:52

score 8 · Answer 1 · edited May 23 '17 at 12:26

8

Consider using java.util.Arrays.

There is a method in there called deepToString. This will work great here.

System.out.println(Arrays.deepToString(table));

Relevant here: Simplest way to print an array in Java

edited May 23 '17 at 12:26

Community

1
1

answered Jan 06 '14 at 22:00

Obicere

2,999
3
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Thanks for the help, I would upvote your answer if I had the rep but apparently my question deserved 2 downvotes, this is very useful, I'm just not too aware with the array utility so I went for the more complicated but what I better understand, and just modified my FOR loop like Tonga said I will definitely look into this and try to learn more about your answer. – Adam Calcanes Jan 06 '14 at 22:19
@AdamCalcanes sounds great. The post I linked contains a lot of information on how to accomplish this. Always great to learn new ways :D – Obicere Jan 06 '14 at 22:20

score 1 · Accepted Answer · answered Jan 06 '14 at 22:05

You need to print out the array separately from entering the number. So you can do something like this:

public class PrintArray {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        int[][] table = new int[4][4];
        for (int i = 0; i < table.length; i++) {
            for (int j = 0; j < table.length; j++) {
                // System.out.println("Enter a number.");
                int x = input.nextInt();
                table[i][j] = x;
            }
            //System.out.println();
        }
        // System.out.println(table);

        for (int i = 0; i < table.length; i++) {
            for (int j = 0; j < table[i].length; j++) {
                System.out.print(table[i][j] + " ");
            }
            System.out.println();
        }
    }
}

score 0 · Answer 3 · answered Jan 06 '14 at 22:00

0

You'll have loop back through those arrays to print out the contents. an array's toString() just prints the reference value.

answered Jan 06 '14 at 22:00

evanchooly

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1
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score 0 · Answer 4 · answered Jan 06 '14 at 22:00

System.out.print(table) calls a method in array class that prints out the identifier of the vairable. you need to either create a for loop that will print out each element like System.out.print(table[i][j]) or use the Arrays class and say Arrays.toString(table);

score 0 · Answer 5 · edited Jan 06 '14 at 22:40

0

Try copying this simple for loop to printing a 4x4 table:

 Scanner input = new Scanner();
    int numArray [] [] = new int [4] [4];
    for ( int c = 0; c < 4; c++ ) {
    for (int d = 0; d < 4; d++) { 
    System.out.print("Enter number : ");
    nunArray [c][d] = input.nextInt();
    } 
    }
    for (int a = 1; a<5;a++) {
    for (int b = 1; b <5;b++) {
    System.out.print(numArray [a][b]+" ");
    }
    System.out.println();
    }

edited Jan 06 '14 at 22:40

Adam Calcanes

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answered Jan 06 '14 at 22:35

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@Adam Calcanes there are errors in your code : line 6, variable should be 'numArray' instead of 'nunArray'. line 11, will also generate java.lang.ArrayIndexOutOfBoundsException. – Kenny Dabiri Oct 26 '16 at 12:48

Printing a 2d array in Java like a table

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