Java - SetLim

public void setLim(int n) {//declaro una variab ent

    if (vacia()) {

        ar = new char[n];

    } else {

        if (ar.length < n) {

            char arr[] = new char[n];

            System.arraycopy(ar, 0, arr, 0, ar.length);

            ar = arr;

        } else {

            char aux[] = new char[n];

            System.arraycopy(this.ar, 0, aux, 0, aux.length);

            ar = aux;

        }

    }