Cloning in Java is tedious to implement. You need to
1. have the class implement cloneable
2. implement the clone method
public void clone
{ try
{ X ret = super.clone();
// now clone all object data fields and" copy all number Data fields
ret.objdata1 = objdata1.clone
ret.numdata1 = numdata1;
return ret;
} catch(CloneNotSupportedException)
{ return null;
}
}
Tip
Use serialization for cloning. As long as all data fields are serializable.
the entire cloning process can be automated.
class EZClone implements Cloneable, Serializable
{ public Object clone()
try
{ ByteArrayOutputStream bout = new ByteArrayOutputStream();
ObjectOutputStream out = new ObjectOutputStream(bout);
out.writeQbject(this);
out.close();
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
ObjectInputStream in = new ObjectInputStream(bin);
Object ret = in.readObject();
in.close();
return ret;
} catch(Exception e)
{ return null;
}
}
class X extends EZClone
{ // no clone necessary
}
