wffweb/src/main/java/com/webfirmframework/wffweb/tag/html/AbstractHtml.java
public AbstractHtml getChildAt(final int index) {

        final Lock lock = sharedObject.getLock(ACCESS_OBJECT).readLock();
        try {
            lock.lock();

            return children.toArray(new AbstractHtml[children.size()])[index];
        } finally {
            lock.unlock();
        }
    }
public AbstractHtml getChildAt(final int index) {

        final Lock lock = sharedObject.getLock(ACCESS_OBJECT).readLock();
        try {
            lock.lock();

            return children.toArray(new AbstractHtml[children.size()])[index];
        } finally {
            lock.unlock();
        }
    }
Gets the child at the specified position. An efficient way to get the
child at particular position. If you want to get the child at 0th(zeroth)
index then use {@code AbstractHtml#getFirstChild()} method instead of
this method.

@param index
from this index the tag will be returned
@return the child at the specified index.
@since 3.0.1
@author WFF