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Example using StringInput and StringOutput 

class IoKonto extends Konto implements StringInputOutput{

  private void init(double saldo, String navn){
    this.saldo = saldo; this.navn = navn;

  public IoKonto(String navn){
  public String toStringRepresentation(){
    return("Konto[" + navn + "|" + saldo + "]");

  public void fromStringRepresentation(String s){
   // only for demo purposes
   String nameComponent = 
     s.substring(s.indexOf('[')+1, s.indexOf('|'));
   String saldoComponent =
      s.substring(s.indexOf('|')+1, s.indexOf(']'));
} // end IoKonto

Navigate to programAn example of a client of IoKonto