Question

我将一个文件的内容读入String(char[]) content：

8264,1
28462,1
15836,1

然后我想将第二列乘以5并附加另一个带有已处理值的文件：

8264,5
28462,5
15836,5

问题在于迭代content。如果我按下图所示进行迭代，那么显然我会得到8，2，6，4等字符，而不是8264,5行。< / p>

FileWriter fw = new FileWriter(filew.getAbsoluteFile());
BufferedWriter bw = new BufferedWriter(fw);
StringBuilder sb = new StringBuilder();
for (int k = 0; k < content.length(); k++) 
{
    char c = content.charAt(k);
    //multiply second column by 5
}

Answer 1

如果你想逐行迭代我会推荐一个扫描仪。

PrintWriter pw = new PrintWriter(...file/stream...);
Scanner sc = new Scanner(...your file/stream/string...);
while (sc.hasNextLine()) {
    String line = sc.nextLine();
    String[] parts = line.split(",");
    int first = Integer.parseInt(parts[0]);
    int second = Integer.parseInt(parts[1]);
    second *= 5;
    pw.println(first + "," + second);
}
sc.close();
pw.close();

如何迭代String（char []）

1 个答案: