How to Write new content at the bottom of previous content in a I/O File

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I am trying to Write new content to the file i've created but when i input some new values it deletes my last values and replace it with the new ones, Is there any way to keep putting new values and put that information in new lines of the file?

    String line = "";
    System.out.println( "Escriba el ID" );
    CL.setID( reader.next() );
    System.out.println( "Escriba el Presupuesto" );
    CL.setPresupuesto( reader.next() );
    System.out.println( "Escriba el Nombre del cliente" );
    CL.setNombre( reader.next() );

    try {
        BufferedReader input = new BufferedReader( new FileReader( file ) );
        Scanner input2 = new Scanner( file );
        PrintWriter output = new PrintWriter( file );

        output.println( "ID: #" + CL.getID() );
        output.println( "Presupuesto: " + CL.getPresupuesto() + " $" );
        output.println( "Nombre: " + CL.getNombre() );
        output.println( line );
        output.println( "----------------------------------------" );
        output.close();
    }
    catch( IOException ex ) {
        System.out.println( "Error!!!!" );
    }

    try {
        Scanner input = new Scanner( file );

        String ID = input.nextLine();
        String c = input.nextLine();
        String Name = input.nextLine();
        System.out.printf( "%s \n%s$\n%s\n", ID, c, Name );
        System.out.println( "Cliente Añadido exitosamente!!!" );
        input.close();

    }
    catch( FileNotFoundException ex ) {
        System.out.println( "ERROR!!!!!!!" );
    }

You are using PrintWriter and by default it does not open file in append mode.

You need to open file in append mode:

PrintWriter pw = new PrintWriter(new FileOutputStream( file, true /* append = true /));

Detailed documentation link

Input/Output with files - C++ Tutorials, ofstream: Stream class to write on files; ifstream: Stream class to read from files; fstream: already existed before, its previous content is deleted and replaced by the new one. All i/o streams objects have, at least, one internal stream pointer: The above example is fine, but as you can see the data was not written to a new line. Example PowerShell to append text to a file on to a new line. To append content on to a new line you need to use the escape character followed by the letter “n”: So to continue the example above you could use: Add-Content C:\temp\test.txt "`nThis is a new

You can do so by getting all of the lines of a file, adding the lines you want to the end of that list, deleting the old file, then re-writing the new & old lines to the file. This is using Java 8 and makes it way simpler

public static void addLines(String file, String...content) {
    Path path = Paths.get(file);
    List<String> existingContent = Files.readAllLines(path);
    existingContent.addAll(content);
    if (Files.exists(path)) {
        Files.delete(path);
    }
    Files.write(path, existingContent);
}

io — Core tools for working with streams — Python 3.8.5 , So will giving a bytes object to the write() method of a text stream. Changed in At the top of the I/O hierarchy is the abstract base class IOBase . It defines the� The print commands write the element to the opened file. If you use the cat command to display the content of the output file, it will be this: New York London Paris New Delhi. As you can see, the list elements have been written line by line in the output file. In the examples, the file has been opened in write mode with the ‘w’ option. All the previous content of the file in this mode will be overwritten.

You can just set append-flag on FileOutputStream:

PrintWriter output = new PrintWriter(new FileOutputStream(new File(file), true);
output.append("ID: #" + CL.getID());

Javadoc says:

Parameters:

file - the file to be opened for writing. append - if true, then bytes will be written to the end of the file rather than the beginning

File Reading and Writing Methods, If you run into problems, visit the Common Pitfalls section at the bottom of this page. After the file content is read in, .close() is called on myfile, closing the file object. 'a' switch makes sure that the new content is tacked on at the end of the existing text file. File I/O is notoriously fraught with stumbling blocks for beginning� opens a text file for appending. (appending means to add text at the end). ios::ate: opens a file for output and move the read/write control to the end of the file. ios::in: opens a text file for reading. ios::out: opens a text file for writing. ios::trunc: truncates the content before opening a file, if file exists.

I/O and Network � The Julia Language, Write a text representation of a value x to the output stream io . New types T should overload show(io::IO, x::T) . julia> struct MyException <: Exception msg:: AbstractString end julia> function Base.showerror(io::IO, Read a single line of text from the given I/O stream or file (defaults to stdin ). If you notice, when the new content is larger than the old (e.g., between the “about” and “contact” panels), the box does resize first. When that’s not an issue (going from larger to smaller content), I think it’s fine to have the content show up before the resize – saves some wait time.

File I/O VIs and Functions - LabVIEW 2018 Help, Requires: Base Development System. Use the File I/O VIs and functions to open and close files, read from and write to Write to Binary File, Writes binary data to a new file, appends data to an existing file, or replaces the contents of a file. Before you plunge into a content writing career, it's important to be aware of the facts. Most writers graduate with a degree or certificate in content writing and are quick to learn the realities of the industry, including: Low pay. Most content writing positions do not pay well, especially entry level writing positions.

For a list of common I/O tasks, see Common I/O Tasks. Unicode surrogate characters must be written out as pairs together in the same call, not individually. If you require support for surrogate pairs in your application, consider using a character array and the Write method overload. See also. Encoding; File and Stream I/O; How to: Read Text

Comments
  • stackoverflow.com/a/8210660/133203
  • Where is the code for initializing/instantiating file variable ?