Question

我有以下代码适用于我。

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) {}
             }

   }

}

但是当我尝试将此代码更改为以下代码时，我得到一个错误-错误：在类MyClass中找不到主要方法，请将该主要方法定义为：public static void main（String [] args）。我需要接收owner和ConsumerName作为程序的参数/输入。

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) {}
             }

   }

}

，这怎么办？

Answer 1

使用String-Array传递参数。main-Method仅具有args参数。

Java Doc: Main Method

您可以将所有所有者传递到数组中，然后将限制器字符串（不能是所有者或使用者）放入其中，然后将所有使用者放入数组中。在主体中，您遍历args数组并为其创建两个数组。

Answer 2

您不能更改public static void main的语法。

在Java中传递多个参数

2 个答案: