Returning an Array incorrectly, overwriting all with the last item

Question

I've seen some similar post but not the same issue I'm having. What I'm trying to do is calling a function that shows the name of the files numbered as

1- File1.txt,
2- File2.txt
..

This works as expected. The problem is that I need to return the path of those files in another Array. When I System.out.print(arrayRutasFicheros[j]) inside for, it shows all paths correctly. But when I try to access arrayRutasFicheros[j] from other functions. It just overwrites all the paths and just shows the last one.

public static String[] listarArchivos() throws IOException{

    File[] listadoDeFiles = documento.listFiles();
    File[] arrayFicheros = null;
    String[] arrayRutasFicheros = null;

    if(documento.exists() ) {

        for (int k=0; k< listadoDeFiles.length ;k++) {

            File ficheroRuta = listadoDeFiles[k];

            File fichero = new File(documento.getPath() + sep+ ficheroRuta.getName());

            if(fichero.isFile()==true) {

                arrayFicheros =new File[] {fichero};

                System.out.println( k + " - " + ficheroRuta.getName());

                for(int j= 0; j<arrayFicheros.length; j++) {

                    arrayRutasFicheros =  new String[] {arrayFicheros[j].getPath()};

                    //here it works and it display all the path
                    System.out.println(arrayRutasFicheros[j]);
                }   

            }   
        }       
    }

    return arrayRutasFicheros;
}

public static muestraUnArchivo() throws IOException {

    String [] Fichero =listarArchivos();

    for(int k=0; k<Fichero.length; k++) {

    //here just the last one
    System.out.print(Fichero[k]);       
    }
}

Expected:

-E:\Eclipse\Files\File1.txt   
-E:\Eclipse\Files\File2.txt  
-E:\Eclipse\Files\File3.txt   

Output:

-E:\Eclipse\Files\File3.txt

Answer 1

Your array is recreated on every iteration of the loop, which is also on an array of length 1. You need a dynamic structure to store the string paths, because you don't know ahead of time how many there are. Also, you don't need to keep creating single element arrays; use a List<String>. Something like,

public static String[] listarArchivos() throws IOException {
    List<String> al = new ArrayList<>();
    if (documento.exists()) {
        File[] listadoDeFiles = documento.listFiles();
        for (File ficheroRuta : listadoDeFiles) {
            File fichero = new File(documento.getPath() 
                    + sep + ficheroRuta.getName());
            if (fichero.isFile()) {
                al.add(fichero.getPath());
            }
        }
    }

    return al.toArray(new String[0]);
}