bean+sql数据库

package org.pan.util;
import java.sql.*;
public class DBConnectionManager {
String driverName = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
String url = "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=shool";
String user = "sa";
String password = "sa";
ResultSet rs=null;

public Connection getConnection() {
try {
Class.forName(driverName);
return DriverManager.getConnection(url, user, password);
}
catch (Exception e) {
e.printStackTrace();
return null;
}
}

public ResultSet executeQuery(String sql) {
try{
DBConnectionManager dcm = new DBConnectionManager();
Connection conn = dcm.getConnection();
Statement stmt=conn.createStatement();
ResultSet rs=stmt.executeQuery(sql);

}catch(Exception e){
e.printStackTrace();
}
return rs;
}
}
在编译的时候出现：
D:\jsp>javac con_sql.java
con_sql.java:3: class DBConnectionManager is public, should be declared in a fil
e named DBConnectionManager.java
public class DBConnectionManager {
^
1 error