Examples of java.util.ArrayList.subList()

java.util.ArrayList.subList()
Returns a view of the portion of this list between the specified {@code fromIndex}, inclusive, and {@code toIndex}, exclusive. (If {@code fromIndex} and {@code toIndex} are equal, the returned list isempty.) The returned list is backed by this list, so non-structural changes in the returned list are reflected in this list, and vice-versa. The returned list supports all of the optional list operations.
This method eliminates the need for explicit range operations (of the sort that commonly exist for arrays). Any operation that expects a list can be used as a range operation by passing a subList view instead of a whole list. For example, the following idiom removes a range of elements from a list:
```
 list.subList(from, to).clear(); 
```
Similar idioms may be constructed for {@link #indexOf(Object)} and{@link #lastIndexOf(Object)}, and all of the algorithms in the {@link Collections} class can be applied to a subList.
The semantics of the list returned by this method become undefined if the backing list (i.e., this list) is structurally modified in any way other than via the returned list. (Structural modifications are those that change the size of this list, or otherwise perturb it in such a fashion that iterations in progress may yield incorrect results.) @throws IndexOutOfBoundsException {@inheritDoc} @throws IllegalArgumentException {@inheritDoc}

            if (userList.size() > numberPerPage)
            {
                int numberOfPages = (int) ((userList.size() - 1 + numberPerPage) / numberPerPage);
                int from = (currentPage - 1) * numberPerPage;
                int to = Math.min(currentPage * numberPerPage,userList.size());
                context.put(SecurityConstants.CONTEXT_USERS, userList.subList(from, to));


                //now build a set of links to access each page (assumed we will show all links)
                StringBuffer pageLinks = new StringBuffer("page: ");
                for (int i = 1; i <= numberOfPages; i++)
                {

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            boolean del = r.nextBoolean();
            int pos = r.nextInt(result.size() + 1);
            int len = Math.min(result.size() - pos, 1 + r.nextInt(4));
            if (del && result.size() > 0)
            { // delete
                result.subList(pos, pos + len).clear();
            }
            else
            {
                for (int k = 0; k < len; k++, pos++)
                {

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            if (userList.size() > numberPerPage)
            {
                int numberOfPages = (int) ((userList.size() - 1 + numberPerPage) / numberPerPage);
                int from = (currentPage - 1) * numberPerPage;
                int to = Math.min(currentPage * numberPerPage,userList.size());
                context.put(SecurityConstants.CONTEXT_USERS, userList.subList(from, to));


                //now build a set of links to access each page (assumed we will show all links)
                StringBuffer pageLinks = new StringBuffer("page: ");
                for (int i = 1; i <= numberOfPages; i++)
                {

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            if (userList.size() > numberPerPage)
            {
                int numberOfPages = (int) ((userList.size() - 1 + numberPerPage) / numberPerPage);
                int from = (currentPage - 1) * numberPerPage;
                int to = Math.min(currentPage * numberPerPage,userList.size());
                context.put(SecurityConstants.CONTEXT_USERS, userList.subList(from, to));


                //now build a set of links to access each page (assumed we will show all links)
                StringBuffer pageLinks = new StringBuffer("page: ");
                for (int i = 1; i <= numberOfPages; i++)
                {

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      list.add(iter.next());
    }
    if (!indexedList) {
      if (list.size() > (endIdx-startIdx)) {
        // Iterator hasn't restricted what is returned so do the index range restriction here
        return list.subList(startIdx, endIdx);
      }
    }
    return list;
  }

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        new Support_ListTest("", alist).runTest();


        ArrayList subList = new ArrayList();
        for (int i = -50; i < 150; i++)
            subList.add(new Integer(i));
        new Support_ListTest("", subList.subList(50, 150)).runTest();
    }


    /**
     * @tests java.util.ArrayList#ArrayList(int)
     */

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    src.add(new Integer(6));


    // so src becomes a list like this:
    // [1, 2, 3, 1, 2, 3, 1, 2, 3, 5, 6]


    sub = new ArrayList(src.subList(3, 11));
    // [1, 2, 3, 1, 2, 3, 5, 6]
    assertEquals("TestA : Returned wrong indexOfSubList, ", 3, Collections
        .indexOfSubList(src, sub));


    sub = new ArrayList(src.subList(6, 11));

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    sub = new ArrayList(src.subList(3, 11));
    // [1, 2, 3, 1, 2, 3, 5, 6]
    assertEquals("TestA : Returned wrong indexOfSubList, ", 3, Collections
        .indexOfSubList(src, sub));


    sub = new ArrayList(src.subList(6, 11));
    // [1, 2, 3, 5, 6]
    assertEquals("TestB : Returned wrong indexOfSubList, ", 6, Collections
        .indexOfSubList(src, sub));


    sub = new ArrayList(src.subList(0, 3));

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    sub = new ArrayList(src.subList(6, 11));
    // [1, 2, 3, 5, 6]
    assertEquals("TestB : Returned wrong indexOfSubList, ", 6, Collections
        .indexOfSubList(src, sub));


    sub = new ArrayList(src.subList(0, 3));
    // [1, 2, 3]
    assertEquals("TestCC : Returned wrong indexOfSubList, ", 0, Collections
        .indexOfSubList(src, sub));


    sub = new ArrayList(src.subList(9, 11));

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    sub = new ArrayList(src.subList(0, 3));
    // [1, 2, 3]
    assertEquals("TestCC : Returned wrong indexOfSubList, ", 0, Collections
        .indexOfSubList(src, sub));


    sub = new ArrayList(src.subList(9, 11));
    // [5, 6]
    assertEquals("TestD : Returned wrong indexOfSubList, ", 9, Collections
        .indexOfSubList(src, sub));


    sub = new ArrayList(src.subList(10, 11));

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