使用UML编写Java 设计模式例子 FactoryMethod Pattern

dn001 2008-04-05 14:20:21

内容: 看了论坛上的文章，读FactoryMethod Pattern UML图，写了个小例子程序。做为文章的补充！

//Creator.java

public abstract class Creator
{
 /**
  * looks like a factory
  * contains some products and some process methods
  */
 protected Product duct;
 abstract String processProduct();
 abstract String processProductSpecial();
 public String Operation()
 {
  return processProduct(); // FactoryMethod for implemention;
 }
}

//ConcreteProduct.java

public class ConcreteProduct extends Product
{
 public ConcreteProduct()
 {
  System.out.println("construct the ConcreteProduct object");
 }
 public String makeString(String str)
 {
  return "This is the product after processing:"+str;
 }
}

//Product.java
public abstract class Product
{
 public abstract String makeString(String str);
}

//ConcreteCreatorA.java

public class ConcreteCreatorA extends Creator
{
 /**
  * You can write some other class like this to override
  * the same methods do diffrent thing;
  */
 public ConcreteCreatorA()
 {
  duct=new ConcreteProduct();
  System.out.println("instanced a product");

 }
 public String processProduct()
 {
  System.out.println("product A:");
  return duct.makeString("Make @#a product");

 }
 public String processProductSpecial()
 {
  System.out.println("special product B:");
  //add another method here
  return duct.makeString("Make Special @#B product");
 }
}

//TestFactoryMethod.java
public class TestFactoryMethod
{
public TestFactoryMethod()
{
}
public static void main(String[] arg)
{
ConcreteCreatorA cc=new ConcreteCreatorA();
System.out.println(cc.Operation());
System.out.println(cc.processProductSpecial());
}
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