Question

拆分包含三个单词的字符串的最佳方法是什么？

我的代码现在看起来像这样（请参阅下面的更新代码）：

BufferedReader infile = new BufferedReader(new FileReader("file.txt"));

        String line;
        int i = 0;

        while ((line = infile.readLine()) != null) {
            String first, second, last;
            //Split line into first, second and last (word)

            //Do something with words (no help needed)
            i++;
        }

这是完整的file.txt：

Allegrettho     Albert          0111-27543
Brio            Britta          0113-45771
Cresendo        Crister         0111-27440
Dacapo          Dan             0111-90519
Dolce           Dolly           0116-31418
Espressivo      Eskil           0116-19042
Fortissimo      Folke           0118-37547
Galanto         Gunnel          0112-61805
Glissando       Gloria          0112-43918
Grazioso        Grace           0112-43509
Hysterico       Hilding         0119-71296
Interludio      Inga            0116-22709
Jubilato        Johan           0111-47678
Kverulando      Kajsa           0119-34995
Legato          Lasse           0116-26995
Majestoso       Maja            0116-80308
Marcato         Maria           0113-25788
Molto           Maja            0117-91490
Nontroppo       Maistro         0119-12663
Obligato        Osvald          0112-75541
Parlando        Palle           0112-84460
Piano           Pia             0111-10729
Portato         Putte           0112-61412
Presto          Pelle           0113-54895
Ritardando      Rita            0117-20295
Staccato        Stina           0112-12107
Subito          Sune            0111-37574
Tempo           Kalle           0114-95968
Unisono         Uno             0113-16714
Virtuoso        Vilhelm         0114-10931
Xelerando       Axel            0113-89124

@Pshemo的新代码建议：

public String load() {
    try {
        Scanner scanner = new Scanner(new File("reg.txt"));

        while (scanner.hasNextLine()) {
            String firstname = scanner.next();
            String lastname = scanner.next();
            String number = scanner.next();
            list.add(new Entry(firstname, lastname, number));
        }
        msg = "The file reg.txt has been opened";
        return msg;
    } catch (NumberFormatException ne) {
            msg = ("Can't find reg.txt");
            return msg;
    } catch (IOException ie) {
            msg = ("Can't find reg.txt");
            return msg;
    }
}

我收到多个错误，出了什么问题？

Answer 1

假设每一行总是包含三个单词而不是分割，那么每行只需使用Scanner方法next三次。

Scanner scanner = new Scanner(new File("file.txt"));
int i = 0;
while (scanner.hasNextLine()) {
    String first = scanner.next();
    String second = scanner.next();
    String last = scanner.next();
    //System.out.println(first+": "+second+": "+last);
    i++;
}

Answer 2

line.split("\\s+"); // don't use " ". use "\\s+" for more than one whitespace

Answer 3

假设该行有3个以上的单词，请使用split(delimiter)方法：

String line = ...;

String[] parts = line.split("\\s+"); // Assuming words are separated by whitespaces, use another if required

然后你可以分别访问第一个，第二个和最后一个：

String first = parts[0];
String second = parts[1];
String last = parts[parts.length() - 1];

请记住，索引从0开始。

Answer 4

String []parts=line.split("\\s+");

System.out.println(parts[0]);
System.out.println(parts[1]);
System.out.println(parts[parts.length-1]);

用三个单词拆分字符串

拆分包含三个单词的字符串的最佳方法是什么？

4 个答案: