Mega Code Archive
Iterator pattern for container
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import java.util.ArrayList;
import java.util.Iterator;
public class TestCorporation {
public static void main(String args[]) {
Corporation corporation = new Corporation();
Division rnd = new Division("R&D");
rnd.add(new VP("A", "R&D"));
rnd.add(new VP("B", "R&D"));
rnd.add(new VP("C", "R&D"));
Division sales = new Division("Sales");
sales.add(new VP("E", "Sales"));
sales.add(new VP("F", "Sales"));
sales.add(new VP("G", "Sales"));
sales.add(new VP("F", "Sales"));
Division western = new Division("Sales");
western.add(new VP("W", "Sales"));
western.add(new VP("Z", "Sales"));
sales.add(western);
VP vp = new VP("Cary", "At Large");
corporation.add(rnd);
corporation.add(sales);
corporation.add(vp);
corporation.print();
}
}
class Corporation extends Corporate {
private ArrayList<Corporate> corporate = new ArrayList<Corporate>();
public Corporation() {
}
public void add(Corporate c) {
corporate.add(c);
}
public void print() {
Iterator iterator = corporate.iterator();
while (iterator.hasNext()) {
Corporate c = (Corporate) iterator.next();
c.print();
}
}
}
abstract class Corporate {
public String getName() {
return "";
}
public void add(Corporate c) {
}
public Iterator iterator() {
return null;
}
public void print() {
}
}
class Division extends Corporate {
private Corporate[] corporate = new Corporate[100];
private int number = 0;
private String name;
public Division(String n) {
name = n;
}
public String getName() {
return name;
}
public void add(Corporate c) {
corporate[number++] = c;
}
public Iterator iterator() {
return new DivisionIterator(corporate);
}
public void print() {
Iterator iterator = iterator();
while (iterator.hasNext()) {
Corporate c = (Corporate) iterator.next();
c.print();
}
}
}
class VP extends Corporate {
private String name;
private String division;
public VP(String n, String d) {
name = n;
division = d;
}
public String getName() {
return name;
}
public void print() {
System.out.println("Name: " + name + " Division: " + division);
}
public Iterator iterator() {
return new VPIterator(this);
}
}
class VPIterator implements Iterator {
private VP vp;
public VPIterator(VP v) {
vp = v;
}
public VP next() {
return vp;
}
public boolean hasNext() {
return false;
}
public void remove() {
}
}
class DivisionIterator implements Iterator {
private Corporate[] corporate;
private int location = 0;
public DivisionIterator(Corporate[] c) {
corporate = c;
}
public Corporate next() {
return corporate[location++];
}
public boolean hasNext() {
if (location < corporate.length && corporate[location] != null) {
return true;
} else {
return false;
}
}
public void remove() {
}
}
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