System.arraycopy getting ava.lang.ArrayIndexOutOfBoundsException.. I am trying to copy data from one array to the next. but I am getting a exception
private String array[] = { "NO DATA YET" };
private void setListData()
{
String array2[] = { "Iphone", "Tutorials", "Gallery", "Android", "item 1", "item 2", "item3", "item 4" };
System.arraycopy(array2, 0, array, 0, array2.length);
}
You're trying to copy 8 items into an array of length 1. You can't do that.
From the documentation:
Otherwise, if any of the following is true, an IndexOutOfBoundsException is thrown and the destination is not modified:
- The srcPos argument is negative.
- The destPos argument is negative.
- The length argument is negative.
- srcPos+length is greater than src.length, the length of the source array.
- destPos+length is greater than dest.length, the length of the destination array.
In this case, destPos + length is 8, and dest.length is 1, hence the exception is being thrown.
Note that arrays in Java have a fixed length. If you want an expandable container, look at ArrayList.
IndexOutOfBoundsException, however, it threw ArrayIndexOutOfBoundsException. That's what confused me, because in my algorithm, I cannot figure out, what was wrong, as it does not provide any details.
ArrayIndexOutOfBoundsException is an IndexOutOfBoundsException - it's a subclass. If you know which statement in your method is failing, you can add logging just before it for what your call is going to do - and then it should be obvious which parameter is causing the problem.Because the length of array is 1.
The declaration array[] = { "NO DATA YET" }; creates an array of length 1 with one item in it.
Instead declare destination array as:
private String array[] = new String[8];
array only has a length of 1 and you're trying to copy 8 things into it from array2. Try using an ArrayList or something that will grow as you need it to grow.
SOLUTION TO ALL TYPES OF ARRAYINDEXOUTOFBOUNDS EXCEPTION:
Understand this with the help of following example facing ArrayIndexOutOfBoundsException:
public static void main(String [] args){
String dest[] = { "Iphone", "Tutorials", "Gallery", "Android", "item 1", "item 2", "item3", "item 4" };
String src[]=new String[8];
System.arraycopy(src, 0, dest, 1, src.length);
System.out.println(dest[4]);
}
Solution to this above case can be any of the following:
1. Either increase the size of destination array so it could find a place.
2. Since we are starting from index 1 so you may copy only 7 elements from the source array.
3. Or you can start copying from index 0 in the destination array so it can accommodate all the array elements of source array.
