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# Solucións BufferedReader e BufferedWriter

1. lectura por pantalla

```java
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class EscrituraPantalla {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String nombreFichero = "LecturaPantalla.txt";

        System.out.println("Introduce texto. Pulsa Enter en línea vacía para terminar:");

        try (FileWriter writer = new FileWriter(nombreFichero)) {
            while (true) {
                String linea = sc.nextLine();
                if (linea.isEmpty()) {
                    break; // termina si la línea está vacía
                }
                writer.write(linea + "\n"); // escribir línea en el fichero
            }
            System.out.println("Texto guardado correctamente en " + nombreFichero);
        } catch (IOException e) {
            System.out.println("Error al escribir el fichero:");
            e.printStackTrace();
        }

        sc.close();
    }
}

```

2. Invertir Palabras

```java
package Invertir;

import java.io.*;

public class Invertir {

        public static void main(String[] args) {

            String ficheroEntrada = "C:\\Users\\iagom\\Desktop\\Entrada.txt";
            String ficheroSalida = "C:\\Users\\iagom\\Desktop\\Salida.txt";

            int numLineas = 0;
            //Contamos las lineas del fichero
            try (BufferedReader contador = new BufferedReader(new FileReader(ficheroEntrada))) {
                while (contador.readLine() != null) {
                        numLineas++;
                }
            } catch (Exception e){
                System.out.println("Error en la lectura del fichero:" + e.getMessage());
            }


            String[][] contenido = new String[numLineas][];
            //Pasar cadenas a un array
            try (BufferedReader lector = new BufferedReader(new FileReader(ficheroEntrada))) {
                String linea;
                int indice = 0;

                while ((linea = lector.readLine()) != null) {
                    contenido[indice] = linea.split(" ");
                    indice++;
                }
            } catch (IOException e){
                System.out.println("Error leyendo las palabras");
            }


            try (BufferedWriter escritor = new BufferedWriter(new FileWriter(ficheroSalida))) {
            //Escribir lineas
                for (int i = contenido.length - 1; i >= 0; i--) {
                    for (int j = contenido[i].length - 1; j >= 0; j--) {
                        escritor.write(contenido[i][j]);
                        escritor.write(" ");
                    }
                    escritor.newLine();
                }
            } catch (IOException e){
                System.out.println("Error en la escritura del fichero");
            }

            System.out.println("El programa ha finalizado correctamente.");

        }
}


```


---

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