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设计模式之组合模式，component

2013-11-29 18:14 162 查看

package liu.composite.demo;
public abstract class Component {
public String name;

public Component(String name){

  this.name = name;

}

public Component(){



}

public abstract void add(Component c);

public abstract void remove(Component c);

public abstract void display(int depth);

}

-----------------------------

package liu.composite.demo;
import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;
public class Composite extends Component {
public Composite(String name){

  super(name);

}

private List<Component> children = new ArrayList<Component>();

@Override

public void add(Component c) {

  children.add(c);



}
@Override

public void remove(Component c) {

  children.remove(c);



}
@Override

public void display(int depth) {

  for(int i = 0 ;i<depth;i++)

   System.out.print("-");

  System.out.println(name);



  for(Iterator tmp = children.iterator();tmp.hasNext();){

   ((Component) tmp.next()).display(depth+2);

   //System.out.println();

  }



}
}

---------------------------

package liu.composite.demo;
public class Leaf extends Component {
public Leaf(String name){

  super(name);

}

@Override

public void add(Component c) {

  System.out.println("can not add to a leaf");



}
@Override

public void remove(Component c) {

  System.out.println("can remove from a leaf");



}
@Override

public void display(int depth) {

  for(int i = 0 ;i<depth;i++)

   System.out.print("-");

  System.out.println(name);



}
}

----------------------------------

package liu.composite.demo;
public class Main {
public static void main(String[] args) {

  Composite root = new Composite("root");

  root.add(new Leaf("Leaf A"));

  root.add(new Leaf("Leaf B"));


  Composite comp = new Composite("Composite x");

  comp.add(new Leaf("Leaf XA"));

  comp.add(new Leaf("Leaf XB"));

  root.add(comp);



  Composite comp2 = new Composite("Composite xy");

  comp2.add(new Leaf("Leaf XYA"));

  comp2.add(new Leaf("Leaf XYB"));

  comp.add(comp2);

  root.add(new Leaf("Leaf C"));

  Leaf leaf = new Leaf("Leaf D");

  root.add(leaf);

  root.remove(leaf);

  root.display(1);



}
}

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标签： java 设计模式

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