Writing and Reading a Note

Now that you can create files, it's time to add real content. You'll write a short note to a text file and then read it back to confirm it was saved correctly. This is a core feature of any note-taking application.

Este exercício faz parte do curso

Input/Output and Streams in Java

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Instruções do exercício

Write the text "Start from the beginning" to a file named "note.txt".
Create a FileWriter in append mode for "note.txt" as fwAppendMode.
Add the text " Add to the end" to the file without overwriting its content.
Use FileReader to read the content of the file and display it on the console, one character at a time.

Exercício interativo prático

Experimente este exercício completando este código de exemplo.

import java.io.FileWriter;
import java.io.FileReader;
import java.io.IOException;

class FileReadWrite {

    public static void main(String[] args) {
        try {
            FileWriter fw = new FileWriter("note.txt");
            // Write "Start from the beginning" to the file
            fw.____("Start from the beginning");
            fw.close();

            // Create a FileWriter in append mode
            FileWriter fwAppendMode = new ____("note.txt", ____);

            // Add " Add to the end" to the end of file
            fwAppendMode.____(" Add to the end");
            fwAppendMode.close();

            FileReader fr = new FileReader("note.txt");
            int character;
            
            // Read the file content character by character
            while ((character = fr.____()) != -1) {
                System.out.print((char) character);
            }
            fr.close();
        } catch (IOException e) {
            System.out.println("An error occurred: " + e.getMessage());
        }
    }
}

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