值之间没有空格 txt java
代码工作正常，除了一个问题。加薪后，值之间的空间消失了，然后我的程序就无法正常工作。
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空间没有增加
Code works fine, except one problem. After increasing salary the spaces beetwen values disapears and then my programm doesn't work well.
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();
I want to know where is the problem and why space doesn't adding
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评论（1）
您正在丢失空间，因为
line.substring(0, line.lastIndexOf(" "))将返回直到最后一个空格的子字符串，不包括空格，因此您可以在line 之后添加空格.substring(0, line.lastIndexOf(" "))如下所示。您也可以使用
String.format创建如下行。You are losing space because
line.substring(0, line.lastIndexOf(" "))will return a substring up to the last space not including the space so you could add a space afterline.substring(0, line.lastIndexOf(" "))like below.Also you can use
String.formatto create the line as below.