I@49d67b41 prints when trying to print a 2d array

Question

This is an unusual problem I have: I've created a 2d int array with dimensions of 3X3, no parameters and when I try to print it out on the screen it displays something like this : [[I@49d67b41. Any suggestions?

public static void main (String[]  args) {
    System.out.println(test2());
}

static int [][] test2 () {
    int [][] l = new int[3][3];
    return l;
}

What do you think it should print and why? – Sotirios Delimanolis Apr 14 '14 at 21:13 — Sotirios Delimanolis, Apr 14 '14 at 21:13

score 3 · Accepted Answer · edited Apr 14 '14 at 21:16

3

Use

System.out.println(Arrays.deepToString(test2));

edited Apr 14 '14 at 21:16

BackSlash

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answered Apr 14 '14 at 21:14

Andres

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3

Nope. You should use `Arrays.deepToString(test2)` in that specific case, as it's a 2d array. Otherwise it will print the same horrible string for each sub-array :) – BackSlash Apr 14 '14 at 21:15
+1 for being on the right lines. Better than my answer. – christopher Apr 14 '14 at 21:15

score 0 · Answer 2 · answered Apr 14 '14 at 21:14

int[][] is a subclass of type Object. The default toString() method is being called, and you're seeing the hex code of your object. You need to implement your own method for printing out the int[][] type.

Example

for(int[] values : test2()) {
    for(int value : values) {
         System.out.print(int + " ");
    }
    System.out.println();
}

I@49d67b41 prints when trying to print a 2d array

2 Answers2