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update a file in java | Loop and Break

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update a file in java

by ayunoradmin · February 4, 2013

to update a file first we have to read from file and then update the contents of that file.

 import java.io.*;

public class UpdateFile {
  public static void main(String[] args) throws Exception {
    File f = new File("c:/new.txt");

    // check if file exists or not
    boolean exists = f.exists();

    StringBuffer buffer = new StringBuffer();
    String str;
    BufferedReader br = new BufferedReader(new FileReader(f));
    while (true) {
      str = br.readLine();
      if (str == null)
        break;
      buffer.append(str);
    }
    String st1 = "All";
    int c1 = buffer.indexOf(st1);
    buffer.replace(c1, c1 + st1.length(), "Some");

    String st2 = "not gold";
    int c2 = buffer.indexOf(st2);
    buffer.replace(c2, c2 + st2.length(), "Diamond");
    br.close();
    BufferedWriter bw = new BufferedWriter(new FileWriter(f));
    bw.write(buffer.toString());
    bw.close();
  }
}

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