设计模式第3篇Builder(第二部分)
下面是重点
Builder具体实现
中国制造4轮汽车
package com.yjsoft.builder;
/**
*
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
* @author yanghx2004
*/
public class Car4WheelBuilder extends CarBuilder {
/**
*@see java.lang.Object#Object()
*/
public Car4WheelBuilder() {
m_car=new Car();
}
/* (non-Javadoc)
* @see com.yjsoft.builder.Builder#buildSteer()
*/
public void buildSteer() {
// TODO Auto-generated method stub
m_car.setSteer("4 car Stree.");
}
/* (non-Javadoc)
* @see com.yjsoft.builder.Builder#buildEngine()
*/
public void buildEngine() {
// TODO Auto-generated method stub
m_car.setEngine("Made in China.");
}
/* (non-Javadoc)
* @see com.yjsoft.builder.Builder#buildWheel()
*/
public void buildWheel() {
// TODO Auto-generated method stub
m_car.setWheel(4);
}
}
小日本造的2轮汽车
package com.yjsoft.builder;
/**
*
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
* @author yanghx2004
*/
public class Car2WheelBuilder extends CarBuilder {
/**
*@see java.lang.Object#Object()
*/
public Car2WheelBuilder() {
m_car=new Car();
}
/* (non-Javadoc)
* @see com.yjsoft.builder.Builder#buildSteer()
*/
public void buildSteer() {
// TODO Auto-generated method stub
m_car.setSteer("2 wheel car.");
}
/* (non-Javadoc)
* @see com.yjsoft.builder.Builder#buildEngine()
*/
public void buildEngine() {
// TODO Auto-generated method stub
m_car.setEngine("Made in JP(GuiZi)");
}
/* (non-Javadoc)
* @see com.yjsoft.builder.Builder#buildWheel()
*/
public void buildWheel() {
// TODO Auto-generated method stub
m_car.setWheel(2);
}
}
调用具体Builder类
public class TestClass {
public static void main(String[] args) {
Director md = new Director(null);
Car4WheelBuilder c4 = new Car4WheelBuilder();
Car2WheelBuilder c2 = new Car2WheelBuilder();
md.setBuilder(c4);
md.construct();
c4.getResult().show();
md.setBuilder(c2);
md.construct();
c2.getResult().show();
}
}
输出
关于具体Builder类实现请参考代码。
1． 总结
在Java里面，线程Pooler与连接Pooler多利用到了Builder模式，详细实现请参考我先前发表的文章。
一般来说利用到某种“缓存”来创建的，利用Builder模式会方便很多，关于某种“缓存”只有自己体会了。