I recently started mutltidimensional int arrays in java. Before that one dimensional arrays had sufficed.
To print those I used System.out.println(Arrays.toString(myarray));
But it won't work with multi dimensional arrays, it does the same thing as it does when you try to print a one dimensional array directly only many times.
You'll need to iterate through it.
The easiest way to do so is to use the provided Arrays.deepToString() which searches for arrays within the array. Note that it, like Arrays.toString(), is only available in Java 1.5+ although I certainly hope that you are using Java 5 by now.
For example:
int[][] myArray = { { 1, 2, 3 }, { 4, 5, 6 } };
System.out.println(Arrays.deepToString(myArray));
Alternatively, you can iterate yourself which also allows for more customization with the style in which you choose to print.
For example:
int[][] myArray = { { 1, 2, 3 }, { 4, 5, 6 } };
for(int[] arr : myArray)
System.out.println(Arrays.toString(arr));
Arrays.deepToString first, since for most cases it's probably preferable.Try something like:
int number[][] = { {1, 2, 3}, {1}, {2}};
for (int i = 0; i < number.length; i++)
System.out.println(Arrays.toString(number[i]));
Try Commons Lang 3's ArrayUtils toString method:
@Test
public void multiArrayToString(){
int[] a = {1,2,3};
int[] b = {4,5,6};
int[][] c = {a, b};
String aCommonsLangToString = ArrayUtils.toString(a);
String bCommonsLangToString = ArrayUtils.toString(b);
String cCommonsLangToString = ArrayUtils.toString(c);
System.out.println(aCommonsLangToString);
System.out.println(bCommonsLangToString);
System.out.println(cCommonsLangToString);
}
Output:
{1,2,3}
{4,5,6}
{{1,2,3},{4,5,6}}
[[1, 2, 3], [4, 5, 6]].you can easily iterate trough the array like this:
if (yourArray != null) {
// Where object type means the type of your array.
for (ObjectType subArray : yourArray) {
// If this method can't receive nulls, then validate that subArray isn't null
System.out.println(Arrays.toString(subArray));
}
}
Arrays.toString()Arrays.deepToString()is better though