How to replace a string in a text file?

Question

Hi All,
i read one text file and based on that i replaced the old character with the new string but it doesnt works.do any one of you have idea on this?
My Code:
String newPassword=(String) getInputText1().getValue();
String password=(String)getSimNo().getValue();
String sampleText = (String) getMobileNo().getValue();
FileReader fr =new FileReader("c:/newLogin.txt");
BufferedReader br =new BufferedReader(fr);
String record=br.readLine();
while (record !=null)
String[] afterSplit=record.split(":");
for (int p = 0; p < 1; p++) {
String userName=afterSplit[1];
String passWord=afterSplit[3];
if(userText.equals(userName) && password.equals(passWord)) {
passWord.replaceAll(passWord,newPassword);
System.out.println("password: " + password +" changed to : "+ newPassword +" successfully");
record =br.readLine();
sample fiile in the text:
userName:sebas:password:navin
userName:sebas1:password:navin1

Answer 1

All readLine does is copy a line of the file into a local variable. Change the copy as you will, the file won't change.
You need to write a new version of the file, with the altered lines. Then, if required, you can delete the original file and rename the new file to the old file name.