System.arraycopy getting java.lang.ArrayIndexOutOfBoundsException

Question

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);
    }

Answer 1

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.

Answer 2

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];

Answer 3

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.