I have a 2d array named multi and its declaration is
Object[][] multi = new Object[10][10];
I tried to add some elements like that x and y are Integers
multi[y][x]=10;
not when i print anything from this array or the hole array i got nulloutput the whay i print
System.out.println(multi[0][0]);
or
for(int r = 0; r < 10; r++) {
for(int g = 0; g <10; g++) {
System.out.println(multi[r][g]);
}
}
Put values to array and print them.
Object[][] multi = new Object[10][10];
Double d = 0.1;
Double anotherD = 2.5;
multi[0][0] = d ;
multi[1][3] = anotherD;
for (int i = 0; i < multi.length; i++)
{
for (int j = 0; j < multi[i].length; j++)
{
System.out.println(multi[i][j]);
}
}
You should see following output when run the above code:
0.1 null [lots of nulls ommited] null 2.5 null [lots of nulls ommited] null
If you array stores obects of the type Object you should consider adding real objects and not just an undeclared value.
Object[][] multi = new Object[10][10];
Instead of:
multi[0][0] = 10;
You should use
multi[0][0] = new Double(10);
Or you do an additional step and declare a variable for that
Double dValue = 10;
multi[0][0] = dValue;
If you only store one type of object (or basic type) you should consider declaring an array of that specific type; e.g. for double:
double[][] multi = new double[10][10];
nullprints, and one print with10, if you only assign one value. Could you include the whole code, or rather the method that is executed this specific code.multi[r](for0 <= r < 10) are initiallynull; they would only not be if you assign them a non-null value subsequently.multi[0][0]=10;and print oly one element like thatSystem.out.println(multi[0][0]);i got anullprint