根据Java中已存在的文件夹名称生成文件夹名称

Question

I'm looking for a way to generate folder names based on already existing folder names ie

    List<String> foos = new ArrayList<String>();        

    foos.add( "myfolder" );          
    foos.add( "myfolder_1" );        
    foos.add( "myfolder_3" );        

    foos.add(generateFolderName(foos, "myfolder")); // should add myfolder_4
    foos.add(generateFolderName(foos, "foobar")); // foobar
    foos.add(generateFolderName(foos, "foobar")); // foobar_1

Has anyone a suggestion how to implement generateFolderName() ?

Answer 1

Thanks for the replies. My answer so far is this. But I'm not sure If have overseen something.

public static String generateFolderName( List<String> p_folder, String p_name )
{
    if( !p_folder.contains(p_name) )
    {                          
        return p_name;
    }                 
    else
    {
        ArrayList<String> matches = new ArrayList<String>();

        for(String item : p_folder)
        {           
            if( Pattern.matches(p_name + "_[0-9]{1,5}", item))
                matches.add(item);                                                
        }            

        int highestIndex = 1;
        for(String item : matches)
        {                                   
            String strNum = item.substring(
                                           item.lastIndexOf("_") + 1, 
                                           item.length()
                                       );    

            int num = new Integer( strNum ) + 1;            

            if (num > highestIndex)
                highestIndex = num;
        }

        return p_name + "_" + highestIndex;
    }        
}