小编ann*_*nno的帖子

所以我的代码看起来像这样:

try {
    while ((line = br.readLine()) != null) {
        Matcher m = urlPattern.matcher (line);
        while (m.find()) {
            System.out.println(m.group(1));

            //the println puts linebreak after each find

            String filename= "page.txt";
            FileWriter fw = new FileWriter(filename,true);
            fw.write(m.group(1));
            fw.close();

            //the fw writes everything after each find with no line break
    }
}

我在行输出正确的形式System.out.println(m.group(1));然而当我以后想要写m.group(1)它显示的内容它写入文件而不放置换行符,因为代码没有.

所以我试图在java中比较2个巨大的文本列表.文本可能如下所示:

list1:值1,值2,值3 ... list2:值1604,值7000,值1 ...

关键是我喜欢从列表1到列表2中的每一行(每个值都在自己的行中)进行比较,并从列表2中删除重复项,将ARRAY 3写入文件.这就是我得到的:

编辑:

    File haveFile = new File("Combine Without Dups.txt");
    BufferedReader br = null;
    br = new BufferedReader(new FileReader(haveFile));
    String line ;
    String list = null ;

    while ((line = br.readLine()) != null) {

    list = line ;

    }

    File compareFile = new File("database.txt");
    BufferedReader br2 = null;
    br2 = new BufferedReader(new FileReader(compareFile));
    String line2 ;
    String list2 = null ;

    while ((line2 = br2.readLine()) != null) {

    list2 = line2 ;

    list2.removeAll(list);