I'm declaring a String array of [2][5]. Up until that point everything is fine. I can insert things into the array.
But when I insert an integer value into the array, 'null' keyword is automatically added before that int value.
So let's say I inserted 5 into arrayName[1][0]. When I print it afterwards I get 'null5'. Which is weird.
What exactly you guys think the problem is. Thanks, C@N.
If you're using += to add items, then I think this could happen. Use String.valueOf()
The only way I can see this happening is if you use +=:
String[] a = new String[1];
a[0] += 1;
System.out.println(a[0]);
Cause if you just use a[0] = 1; you would get compile error.
The reason you get null5 is because you are concatenating the string "null" with 5:
a[0] = (String) null + 1
So the question is what are you trying to achieve? Simply setting the value or adding to it?
If you just want to set it use:
String[] a = new String[1];
a[0] = Integer.toString(1);
System.out.println(a[0]);
If you do want to append to it:
String[] a = new String[1];
if (a[0] == null) {
a[0] = Integer.toString(1);
} else {
a[0] += 1;
}
System.out.println(a[0]);
if you are using any String variable let say myString (as a instance variable having default value null) and doing someting like this -
int i=5;
myString = myString+i;
because you are not initializing String mystring it get default value null and add up with i.
This may be one of the situation.
array[n][m]=String.valueOf(value).arrayName[1][0] = 5;does not work. Neither doesarrayName[1][0] = new Integer(5);.