sql - Filling combo box throws java.lang.String cannot be cast to java.util.ArrayList -


for time had problem filling in combobox db data, code combo box:

sqlconnect con = new sqlconnect();  sqlutility select = new sqlutility();  arraylist <string> categories  = (arraylist) select.select("select category_name gamecategory"); jcombobox combobox = new jcombobox(categories.toarray()); system.out.println(categories);

code select in sqlutility

public class sqlutility<t> {     private preparedstatement pst = null;     private resultset rs          = null;     private sqlconnect database;      public sqlutility(){         database = sqlconnect.getdatabaseconnectioninstance();     }     @suppresswarnings("unchecked")     public t select(string query) {         try {             pst = database.conn.preparestatement(query);             rs  = pst.executequery();             if(rs.next()) {                 return (t) rs.getstring(1);              }         } catch (sqlexception e) {             e.printstacktrace();     }     return null; }

i have checked on different class connection works , im able retrieve data, code combobox incorrect, ideas?


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