Search and Replace Content inside a File

Search and Replace Content inside a File
Today, We are going to see how to search a file for specific content and replace the content and write to a new File.

Let us create a text document with some content in it

Now we are going to write a code to change “File 1” into “File 2”, The content will be

“Sample Content in File 2”

public class FileOperation {
    
    public static void main(String[] args) throws Exception 
    {
         try
             {
             File file = new File("F://File1.txt");
             BufferedReader reader = new BufferedReader(new FileReader(file));
             String line = "", oldtext = "";
             while((line = reader.readLine()) != null)
                 {
                 oldtext += line + "\r\n";
                }
             reader.close();

             String replacedtext  = oldtext.replaceAll("File 1", "File 2");
           

             FileWriter writer = new FileWriter("F://File2.txt");
             writer.write(replacedtext);


             writer.close();

            }
            catch (IOException ex )
             {
             ex.printStackTrace();
            }
    }
}

Once the code is executed, File2.txt will get created and content will be,