没有 space beetwen 值 txt java

Question

代码工作正常，除了一个问题。加薪后 space 的 beetwen 值消失了，然后我的程序就不能正常工作了。

Joe 2022/04/05 HR-Manager44200
Steve 2022/04/06 Admin 100000

Scanner console = new Scanner(System.in); 
System.out.print("Name of employee : "); 
String pID = console.nextLine(); System.out.print("Allowance : "); 
replenish = console.nextInt();    
File originalFile = new File("worker.txt");
    BufferedReader br = new BufferedReader(new FileReader(originalFile));

    File tempFile = new File("tempfile.txt");
    PrintWriter pw = new PrintWriter(new FileWriter(tempFile));

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

        if (line.contains(pID)) {
            String strCurrentSalary = line.substring(line.lastIndexOf(" "));
            if (strCurrentSalary != null || !strCurrentSalary.trim().isEmpty()) {
                int replenishedSalary = Integer.parseInt(strCurrentSalary.trim()) + replenish;
                System.out.println("Sum with added : " + replenishedSalary);
                line = line.substring(0, line.lastIndexOf(" ")) + replenishedSalary;
            }

        }
        pw.println(line);
        pw.flush();
    }
    pw.close();
    br.close();

我想知道问题出在哪里以及为什么space没有添加

Answer 1

你正在丢失 space 因为 line.substring(0, line.lastIndexOf(" ")) 将 return 一个子字符串直到最后一个 space 不包括 space 所以你可以添加一个space 在 line.substring(0, line.lastIndexOf(" ")) 之后，如下所示。

line = line.substring(0, line.lastIndexOf(" ")) + " " + replenishedSalary;

您也可以使用 String.format 来创建下面的行。

line = String.format("%s %d",line.substring(0, line.lastIndexOf(" ")),replenishedSalary)

没有 space beetwen 值 txt java

no space beetwen values txt java

java

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