这是什么问题
--------------------Configuration: JDK version 1.3.1_01 <Default>--------------------
D:\java_test\ManageServer.java:47: cannot resolve symbol
symbol : constructor DBControl (java.lang.String,java.lang.String,java.lang.String,java.io.PrintWriter)
location: class DBControl
DBControl dec = new DBControl(DBSource,UserName,Password,out);
^
1 error
Process completed.