The atoms and the bonds are represented in the application by the Java ™ classes
Atom
and
Bond
. These classes obey the JavaBeans™
conventions, for example, the
Atom
class has a property called
symbol
which represents the abbreviated symbol of the element; this
property can be accessed through the methods
setSymbol
and
getSymbol
.
The Atom class
The following code example shows part of the
Atom
class.
Bean property in the Atom class
/**
* A class that represents an atom.
*/
public class Atom
{
...
private String symbol;
public String getSymbol()
{
return symbol;
}
public void setSymbol(String symbol)
{
this.symbol = symbol;
}
}
The
Atom
class has also a
name
property (the name of the element) , and an
id
property, which identifies the atom in the molecule.
The Bond class
The
Bond
class has two properties
firstAtom
and
secondAtom
which contain the identifiers of the two atoms linked by the
bond, and also a
type
property which can have the values
single
or
double
.
The Molecule class
A molecule is represented by an instance of the class
Molecule
. A molecule contains a list of atoms and a list of bonds.
The following code example shows the
Molecule
class.
Arrays of objects in the Molecule class
public class Molecule
{
private ArrayList atoms = new ArrayList();
private ArrayList bonds = new ArrayList();
public Atom[] getAtoms()
{
return (Atom[]) atoms.toArray(new Atom[0]);
}
public Bond[] getBonds()
{
return (Bond[]) bonds.toArray(new Bond[0]);
}
}