[英]How to replace a specific character in a text file by giving the index value?
遇到了這段代碼,該代碼替換了給定值的所有字符。
File temp = File.createTempFile("newfile", ".txt");
FileWriter fw = new FileWriter(temp);
Reader reader = new FileReader(file);
BufferedReader br = new BufferedReader(reader);
while (br.ready()) {
fw.write(br.readLine().replaceAll("n", "j") + "\n");
}
fw.close();
br.close();
reader.close();
temp.renameTo(file);
}
沒有用“ j”代替所有的“ n”,沒有辦法指定我只想更改的索引嗎?
while語句中的行如下:
fw.write(br.readLine().replaceAll("n", "j") + "\n");
可以擴展為:
String str = br.readLine(); //get text
String replace = str.replaceAll("n", "j"); //replace content
replace = replace + "\n"; //add new line
fw.write(replace); //write to file
對於替換某個索引的實例,您需要執行類似的操作:
StringBuilder str = new StringBuilder(br.readLine()); //Read line into StringBuilder
if(str.length() > 3) //Check if string is long enough
str.setChar(4, 'x'); //Replace character in line at index 4 to 'x'
fw.write(str); //write to file
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