Java Tutorial/Design Pattern/Composite Pattern

Flexible structure Composite

   <source lang="java">

import java.util.ArrayList; import java.util.Iterator; interface Movable {

 void operation();

} class File implements Movable {

 private String name;
 public File(String name) {
   this.name = name;
 }
 public String toString() {
   return name;
 }
 public void operation() {
   System.out.println(this);
 }

} class FileTree extends ArrayList<Movable> implements Movable {

 private String name;
 public FileTree(String name) {
   this.name = name;
 }
 public String toString() {
   return name;
 }
 public void operation() {
   System.out.println(this);
   for (Iterator<Movable> it = iterator(); it.hasNext();)
     it.next().operation();
 }

} public class CompositeStructure {

 public static void main(String args[]) {
   FileTree root = new FileTree("root");
   root.add(new File("Leaf1"));
   FileTree c2 = new FileTree("Node1");
   c2.add(new File("Leaf2"));
   c2.add(new File("Leaf3"));
   root.add(c2);
   c2 = new FileTree("Node2");
   c2.add(new File("Leaf4"));
   c2.add(new File("Leaf5"));
   root.add(c2);
   root.operation();
 }

}</source>