软件体系结构期末考试总结（下）

public class SingleObject { //创建 SingleObject 的一个对象 private static SingleObject instance = new SingleObject(); //让构造函数为 private，这样该类就不会被实例化 private SingleObject(){} //获取唯一可用的对象 public static SingleObject getInstance(){ return instance; } public void showMessage(){ System.out.println(“Hello World!”); } }
public class SingletonPatternDemo { public static void main(String[] args) { //获取唯一可用的对象 SingleObject object = SingleObject.getInstance(); //显示消息 object.showMessage(); } }

public class SingleObject { 
//创建 SingleObject 的一个对象 
  private static SingleObject instance = new SingleObject(); 
//让构造函数为 private，这样该类就不会被实例化 
  private SingleObject(){} 
//获取唯一可用的对象 
  public static SingleObject getInstance(){ 
    return instance; 
  } 
  public void showMessage(){
  System.out.println("Hello World!"); 
  } 
}

public class SingletonPatternDemo { 
  public static void main(String[] args) { 
//获取唯一可用的对象 
  SingleObject object = SingleObject.getInstance(); 
//显示消息 
  object.showMessage(); 
  } 
}

/* 抽象工厂的抽象类，Java定义为接口*/
public interface AbstractFactory {
    //创建产品的方法
    public AbstractProductA  CreateProductA();
    public AbstractProductB  CreateProductB();
}
/*抽象产品接口*/
public interface AbstractProductA {
}
public interface AbstractProductB {
}
/*实际的产品*/
public class ProductA1 implements AbstractProductA {
    //实际的产品A1
}
public class ProductA2 implements AbstractProductA {
    //实际的产品A2
}
public class ProductB1 implements AbstractProductB {
    //实际的产品B1
}
public class ProductB2 implements AbstractProductB {
    //实际的产品B2
}
/*在以下程序中，CFactory是ConcreteFactory的简写*/
/*在第1个车间中，创建实际产品A1*/
public class CFactory1 implements AbstractFactory {
    public AbstractProductA  CreateProductA() {
        return new ProductA1();
    }
}
/*在第1个车间中，创建实际产品B1*/
public class CFactory1 implements AbstractFactory {
    public AbstractProductB  CreateProductB() {
        return new ProductB1();
    }
}
/*在第2个车间中，创建实际产品A2*/
public class CFactory2 implements AbstractFactory {
    public AbstractProductA  CreateProductA() {
        return new ProductA2();
    }
}
/*在第2个车间中，创建实际产品B2*/
public class CFactory2 implements AbstractFactory {
    public AbstractProductB  CreateProductB() {
        return new ProductB2();
    }
}

import java.util.*;
public class ObserverPattern
{
    public static void main(String[] args)
    {
        Subject subject=new ConcreteSubject();
        Observer obs1=new ConcreteObserver1();
        Observer obs2=new ConcreteObserver2();
        subject.add(obs1);
        subject.add(obs2);
        subject.notifyObserver();
    }
}
//抽象目标
abstract class Subject
{
    protected List<Observer> observers=new ArrayList<Observer>();   
    //增加观察者方法
    public void add(Observer observer)
    {
        observers.add(observer);
    }    
    //删除观察者方法
    public void remove(Observer observer)
    {
        observers.remove(observer);
    }   
    public abstract void notifyObserver(); //通知观察者方法
}
//具体目标
class ConcreteSubject extends Subject
{
    public void notifyObserver()
    {
        System.out.println("具体目标发生改变...");
        System.out.println("--------------");       
        for(Object obs:observers)
        {
            ((Observer)obs).response();
        }
    }          
}
//抽象观察者
interface Observer
{
    void response(); //反应
}
//具体观察者1
class ConcreteObserver1 implements Observer
{
    public void response()
    {
        System.out.println("具体观察者1作出反应！");
    }
}
//具体观察者1
class ConcreteObserver2 implements Observer
{
    public void response()
    {
        System.out.println("具体观察者2作出反应！");
    }
}

import java.util.ArrayList;
import java.util.List;
public class Employee {
   private String name;
   private String dept;
   private int salary;
   private List<Employee> subordinates;
   //构造函数
   public Employee(String name,String dept, int sal) {
      this.name = name;
      this.dept = dept;
      this.salary = sal;
      subordinates = new ArrayList<Employee>();
   }
   public void add(Employee e) {
      subordinates.add(e);
   }
   public void remove(Employee e) {
      subordinates.remove(e);
   }
   public List<Employee> getSubordinates(){
     return subordinates;
   }
   public String toString(){
      return ("Employee :[ Name : "+ name 
      +", dept : "+ dept + ", salary :"
      + salary+" ]");
   }   
}

import java.util.ArrayList;
import java.util.List;
public class Employee {
   private String name;
   private String dept;
   private int salary;
   private List<Employee> subordinates;
   //构造函数
   public Employee(String name,String dept, int sal) {
      this.name = name;
      this.dept = dept;
      this.salary = sal;
      subordinates = new ArrayList<Employee>();
   }
   public void add(Employee e) {
      subordinates.add(e);
   }
   public void remove(Employee e) {
      subordinates.remove(e);
   }
   public List<Employee> getSubordinates(){
     return subordinates;
   }
   public String toString(){
      return ("Employee :[ Name : "+ name 
      +", dept : "+ dept + ", salary :"
      + salary+" ]");
   }   
}