所以,到目前为止,我已经查看了这个论坛上的每一个建议,但没有一个能真正帮助我找到我需要的答案。
这是我的主要代码: 我已经省去了工具,因为这很好。
public class Management {
private static int Price1 = 0;
private static int Price2 = 0;
public static void main(String[] args) {
try
{
Scanner file = new Scanner(new File("friendsfile"));
String s;
while(file.hasNext())
{
s = file.nextLine();
if(s.contains("House 1"))
{
Price1 = getPrice(s);
}
if(s.contains("House 2"))
{
Price2 = getPrice(s);
}
}
Filewriter fw = new Filewriter();
fw.fileWriter(Price1,Price2);
}
catch(FileNotFoundException fnfe)
{
System.out.println("File not found");
}
catch(Exception e)
{
System.out.println("HERE IS AN ERROR MATE!");
}
}
private static int getPrice(String s)
{
StringTokenizer st = new StringTokenizer(s,";");
st.nextToken();
int price1 = Integer.parseInt(st.nextToken().replace(" ",""));
return price1;
}
}
现在Filewriter看起来像这样:
public class Filewriter {
public static void fileWriter(int price1, int price2)
{
System.out.println("Ye");
final String FILE_PATH = "housesfile";
final String MARKER_LINE1 = "price1";
final String TEXT_TO_ADD1 = "price1: "+price1;
final String MARKER_LINE2 = "price2";
final String TEXT_TO_ADD2 = "price2: "+price2;
List<String> fileLines = new ArrayList<String>();
Scanner scanner = null;
try {
scanner = new Scanner(new File(FILE_PATH));
while (scanner.hasNextLine()) {
String line = scanner.nextLine();
fileLines.add(line);
if (line.trim().equalsIgnoreCase(MARKER_LINE1)) {
fileLines.add(TEXT_TO_ADD1);
}
if (line.trim().equalsIgnoreCase(MARKER_LINE2)) {
fileLines.add(TEXT_TO_ADD2);
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
if (scanner != null) {
scanner.close();
}
}
PrintWriter pw = null;
try {
pw = new PrintWriter(new File(FILE_PATH));
for (String line : fileLines) {
pw.println(line);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
if (pw != null) {
pw.close();
}
}
}
}
基本上我想要:
House 1: price; 520592
House 2: price; 342038
来自一个文件的那些价格编号,转换为此文件,这是另一个文件。
house #1
owner: -NAME-
price1: 500000
info: 3 bedrooms, 3 bathrooms.
last changed: - DATE -
rented: no
house #2
owner: -NAME-
price2: 150000
info: 3 bedroom, 3 bathroom.
last changed: -date-
rented: no
现在,它不会改变文件中的任何内容,为什么会这样?请帮忙。
答案 0 :(得分:0)
这是因为您在equalsIgnoreCase()
课程中使用Filewriter
并将其与price1
,price2
进行比较。但是,您的文件的值为price1: 500000
。
因此,将equalsIgnoreCase()
更改为contains()
,它应该有效。
更好,将两者更改为 大写 ,然后匹配:
line.trim().toLowerCase().contains(MARKER_LINE1.toLowerCase())
因此,您在Filewrite类中的while循环将是:
while (scanner.hasNextLine()) {
String line = scanner.nextLine();
fileLines.add(line);
if (line.trim().toLowerCase().contains(MARKER_LINE1.toLowerCase())) {
fileLines.add(TEXT_TO_ADD1);
}
if (line.trim().toLowerCase().contains(MARKER_LINE2.toLowerCase())) {
fileLines.add(TEXT_TO_ADD2);
}
}
修改强>
已尝试并且您的代码有效,但它还包含您之前添加的price1
,price2
值,您可能希望排除/覆盖(在上面修改的if语句中):
house #1
owner: -NAME-
price1: 500000
price1: 520592
info: 3 bedrooms, 3 bathrooms.
last changed: - DATE -
rented: no
house #2
owner: -NAME-
price2: 150000
price2: 342038
info: 3 bedroom, 3 bathroom.
last changed: -date-
rented: no