CODEWITHSUNDEEP
javaarrays
SJS
SJS

Reputation: 5667

System.arraycopy getting java.lang.ArrayIndexOutOfBoundsException

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);
    }

Upvotes: 5

Views: 13541

Answers (4)

Khushboo Sharma
Khushboo Sharma

Reputation: 11

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.

Upvotes: 0

mamboking
mamboking

Reputation: 4637

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.

Upvotes: 1

Suraj Chandran
Suraj Chandran

Reputation: 24791

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];

Upvotes: 1

Jon Skeet
Jon Skeet

Reputation: 1502086

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.

Upvotes: 10

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