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java进程多个字符串参数(java process multiple string arguments)

 我在java中有以下代码：  
public void loadFiles(String file_1, String file_2) throws FileNotFoundException, IOException {

    String line_file1;
    String line_file2;
    BufferedReader buf_file1 = new BufferedReader(new FileReader(new File(file_1)));
    BufferedReader buf_file2 = new BufferedReader(new FileReader(new File(file_2)));

}
 
 现在，当他运行此过程时，他同时期望file_1和file_2。 但是，当只有file_1时，我也想让它通过。 我应该如何指定这个？ 

I have the following code in java: 
public void loadFiles(String file_1, String file_2) throws FileNotFoundException, IOException {

    String line_file1;
    String line_file2;
    BufferedReader buf_file1 = new BufferedReader(new FileReader(new File(file_1)));
    BufferedReader buf_file2 = new BufferedReader(new FileReader(new File(file_2)));

}
 
Now when he runs this process, he expects both a file_1 and file_2. But I also want to make it go through when there is only a file_1. How should I specify this?

原文：https://stackoverflow.com/questions/37985580

更新时间：2023-01-12 13:01

最满意答案

 像这样的东西？  
 http://murrayhopkins.wordpress.com/2008/10/28/mysql-left-join-on-last-or-first-record-in-the-right-table/  
 编辑：我认为它必须是这样的，但我也不是SQL专家：  
SELECT tf_threads.*, tf_posts_tmp.*
FROM tf_threads
LEFT JOIN (SELECT p1.*
           FROM tf_posts as p1
           LEFT JOIN tf_posts AS p2
           ON p1.postid = p2.postid AND p1.date < p2.date) as tf_posts_tmp
ON (tf_threads.thread_id=tf_posts_tmp.thread_id)

Something like this? 
http://murrayhopkins.wordpress.com/2008/10/28/mysql-left-join-on-last-or-first-record-in-the-right-table/ 
Edit: I think that it has to be something like this, but I'm also not an SQL expert: 
SELECT tf_threads.*, tf_posts_tmp.*
FROM tf_threads
LEFT JOIN (SELECT p1.*
           FROM tf_posts as p1
           LEFT JOIN tf_posts AS p2
           ON p1.postid = p2.postid AND p1.date < p2.date) as tf_posts_tmp
ON (tf_threads.thread_id=tf_posts_tmp.thread_id)

java进程多个字符串参数(java process multiple string arguments)

最满意答案

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