1. Common Data Type

public class Matryoska

implements java.io.Serializable {

private Matryoska child;

private String strMicrofilm;

public Matryoska(String strMicrofilm,

Matryoska child){

setChild(child);

setMicrofilm(strMicrofilm);

}

public void setMicrofilm (String strMicrofilm){

this.strMicrofilm = strMicrofilm;

}

public void setChild(Matryoska child){

this.child = child;

}

public Matryoska getChild(){

return child;

}

public String getMicrofilm(){

return strMicrofilm;

}

}// class Matryoska