Concatenate arrays to a List

This is a simple code snippet which explains, how to concatenate two arrays
into a list

private List getChildren(ContextNode parentItem) {
List siblings = null;
siblings = new ArrayList();
Collections.addAll(siblings, ((ContextNode)parentItem).getChildNodes());
Collections.addAll(siblings, ((ContextNode)parentItem).getAttributes());
return siblings;
}

Convert HashMap to an array

Map aMap = new HashMap (  ) ; 
 aList = new ArrayList (  aMap.values (  )   ) ;  
 aMap.clear (  ) ;