Oracle无效标识符不理解字符串

在JDBC中，您的SQL语句不应以分号终止。

更改

String command = "SELECt distinct fname, lname, student_id FROM student"+       " where degree='"+ degree + "';";

至

String command = "SELECt distinct fname, lname, student_id FROM student"+       " where degree='"+ degree + "'";