How to find output?

Question

How do you know what the output of a double array?
For example, if the code is:

int[][] myArr = {{1,2,3}.{4,5,6}};
int x = myArr[2][1];
System.out.println(x);

//*how do you know what the output is?

Answer 1

this code doest work:

- you need to sepperate the array with a "," not a "."

- you say myArr[2][1] but the first number is the row, and the scond number is the number in that row

Answer 2

The two arrays have an index (starts at 0) and each value have an index (starts at 0)

First array (1,2,3)
myArr[0][0] - myArr[0][2]
Second array (4,5,6)
myArr[1][0] - myArr[1][2]

5 -> myArr[1][1]
2 -> myArr[0][1]
4 -> myArr[1][0]

myArr[2][1] does not exist.