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import java.util.ArrayList; import java.util.UUID; public class QueryTool { public class Query { public QueryResults executeQuery(String query) { System.out.println( "Executing Query: " + query ); QueryResults resultSet = new QueryResultsImpl() ; resultSet.fetchData(); return resultSet ; } } public QueryResults query(String str) { Query q = new Query() ; QueryResults resultSet = q.executeQuery(str); return resultSet ; } public ArrayList map(QueryResults rs) { ArrayList out = new ArrayList<>() ; QueryResultsIterator iter = rs.createIterator() ; while ( !iter.isDone() ) { String key = UUID.randomUUID().toString(); out.add( key + " => " + iter.currentItem() ) ; iter.next(); } return out ; } public static void main(String[] args) { QueryTool q = new QueryTool() ; QueryResults dataset = q.query( "select * from test" ) ; ArrayList mapset = q.map(dataset) ; for (String item : mapset ) { System.out.println( item ) ; } } }