关于Decorator Pattern 被包装的对象生成顺序的问题

关于包装类包装之后，对象生成顺序

 

package pku.ss.caoning.ipctest.decoratorTest;

 

public abstract class AbstractDecorator implements Parent {
 private Parent object;
 
 public AbstractDecorator(Parent object){
  this.object=object;
 }
 
 public void print() {
  // TODO Auto-generated method stub
  System.out.println("Decorator");
 }

 

}

---

package pku.ss.caoning.ipctest.decoratorTest;

 

public class ConcreteClass implements Parent {
 public ConcreteClass(){
  System.out.println("ConcreteClass");
 }
 
 public void print() {
  // TODO Auto-generated method stub
  
 }

 

}

---

package pku.ss.caoning.ipctest.decoratorTest;

 

public class ConcreteDecorator1 extends AbstractDecorator {

 

 public ConcreteDecorator1(Parent object) {
  super(object);
  // TODO Auto-generated constructor stub
  System.out.println("ConcreteDecorator1");
 }

 

}

---

package pku.ss.caoning.ipctest.decoratorTest;

 

public class ConcreteDecorator2 extends AbstractDecorator {

 

 public ConcreteDecorator2(Parent object) {
  super(object);
  // TODO Auto-generated constructor stub
  System.out.println("ConcreteDecorator2");
 }

 

}

---

package pku.ss.caoning.ipctest.decoratorTest;

 

public class Main {

 

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  new ConcreteDecorator2(new ConcreteDecorator1(new ConcreteClass()));
 }

 

}

---

package pku.ss.caoning.ipctest.decoratorTest;

 

public interface Parent {

 

 public void print();
}

---

结果是：

ConcreteClass
ConcreteDecorator1
ConcreteDecorator2

可以看出来new ConcreteDecorator2(new ConcreteDecorator1(new ConcreteClass()));的生成顺序是从内而外