protected ArrayMapEntryMemory entryNext(ArrayMapEntryMemory entry) {
        return entry.next;
    }
Gets the <code>next</code> field from a <code>HashEntry</code>.
Used in subclasses that have no visibility of the field.

@param entry the entry to query, must not be null
@return the <code>next</code> field of the entry
@throws NullPointerException if the entry is null
@since Commons Collections 3.1
jphp-runtime/src/php/runtime/memory/support/ArrayMemoryMap.java