Java IndexOutOfBoundsException "Source Does Not Fit in Dest"

Java IndexOutOfBoundsException "Source Does Not Fit in Dest"

Learn about the IndexOutOfBoundsException: "Source does not fit in dest" in Java. We're going to look at why we get this error when using the Collections.copy method and how it can be solved. We'll also look at alternatives to Collections.copy to make a copy of the list.

1. Overview

In Java, making a copy of a List _can sometimes produce an _IndexOutOfBoundsException: “Source does not fit in dest”. In this short tutorial, we're going to look at why we get this error when using the Collections.copymethod and how it can be solved. We'll also look at alternatives to _Collections.copy _to make a copy of the list.

2. Reproducing the Problem

Let's start with a method to create a copy of a List _using the _Collections.copy method:

static List<Integer> copyList(List<Integer> source) {
    List<Integer> destination = new ArrayList<>(source.size());
    Collections.copy(destination, source);
    return destination;
}

Here, the copyList method creates a new list with an initial capacity equal to the size of the source list. Then it tries to copy the elements of the source list to the destination list:

List<Integer> source = Arrays.asList(1, 2, 3, 4, 5);
List<Integer> copy = copyList(source);

However, once we make a call to the copyList method, it throws an exception java.lang.IndexOutOfBoundsException: Source does not fit in dest.

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