在Java中传递多个参数

Question

I have below code working for me.

import java.sql.*;
class MyClass {
  public static void main (String[] Owner ) throws Exception
  {
   Class.forName ("oracle.jdbc.OracleDriver");

   Connection conn = DriverManager.getConnection
     ("jdbc:oracle:thin:@//host:port/SID", "username", "password");

   try {
     Statement stmt = conn.createStatement();

     try {
          for (int i=0; i < owner.length; i++){
             String consumerName =  "TestConsumer";
             ResultSet msgs = Stmt.executeQuery("select msg_id from Table where owner = '" + owner[i] + "' and consumer_name = '" + consumerName + "' and msg_state = 'READY'" );

                   while (msgs.next())
                     System.out.println (msgs.getString(1));
                                     try { msgs.close(); } catch (Exception closeMsgsExcp) {}
             } 
        }     

            finally {
             try { stmt.close(); } catch (Exception closeStmtExcp) {}
               }
      } 

      finally {
           try { conn.close(); } catch (Exception closeConnExcp) {}
             }

   }

}

But when i try to change this code to the following i get an error - Error: Main method not found in class MyClass, please define the main method as: public static void main(String[] args). I need to receive owner and consumerName as arguments/input for my program.

import java.sql.*;
class MyClass {
  public static void main (String[] Owner, String[] consumerName ) throws Exception
  {
   Class.forName ("oracle.jdbc.OracleDriver");

   Connection conn = DriverManager.getConnection
     ("jdbc:oracle:thin:@//host:port/SID", "username", "password");

   try {
     Statement stmt = conn.createStatement();

     try {
          for (int i=0; i < owner.length; i++){
             //String consumerName =  "TestConsumer";
             ResultSet msgs = Stmt.executeQuery("select msg_id from Table where owner = '" + owner[i] + "' and consumer_name = '" + consumerName[i] + "' and msg_state = 'READY'" );

                   while (msgs.next())
                     System.out.println (msgs.getString(1));
                                     try { msgs.close(); } catch (Exception closeMsgsExcp) {}
             } 
        }     

            finally {
             try { stmt.close(); } catch (Exception closeStmtExcp) {}
               }
      } 

      finally {
           try { conn.close(); } catch (Exception closeConnExcp) {}
             }

   }

}

, how can this be done?

Answer 1

Use the String-Array to pass the parameters in. The main-Method has only the args parameter.

Java Doc: Main Method

You can pass all owners into the array, then put a limiter String into it (which can't be an owner or consumer) and then put all consumers into the array. In the main you iterate over the args-array and create two arrays of it.

Answer 2

您不能更改public static void main的语法。