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  • 设计模式(5):建造者模式

    建造者模式:

    定义:

    将一个复杂对象的构建与它的表示分离,使得相同的构建过程能够创建不同的表示。

    类图:

    4个角色:

    1.Product产品类
    一般是实现了模板方法模式。

    2.Builder抽象建造者
    规范产品的组建,通常是由子类实现。

    3.ConcreateBuilder
    实现抽象类定义的全部方法,而且返回一个组件好的对象。

    4.Director导演类
    负责安排已有模块的顺序,然后告诉Builder開始建造。


    //产品类
    
    class Product {
    	public void doSomething() {
    		// 独立业务处理
    	}
    }
    
    // 抽象建造者
    abstract class Builder {
    	// 设置产品的不同部分,以获得不同的产品
    	// 不同的部分,可能是零件的不同。也可能是组装顺序的不同
    	public abstract void setPart();
    
    	// 建造产品
    	public abstract Product buildProduct();
    }
    
    // 详细建造者
    class ConcreateProduct extends Builder {
    	private Product product = new Product();
    
    	// 设置产品零件
    	public void setPart() {
    		// 产品类内的逻辑处理
    	}
    
    	// 组件一个产品
    	public Product buildProduct() {
    		return product;
    	}
    }
    
    // 导演类
    // 导演类起到封装作用,避免高层模块深入到建造者内部的实现类
    class Director {
    	private Builder builder = new ConcreateProduct();
    
    	// 构建不同的产品
    	public Product getAProduct() {
    		builder.setPart();
    		return builder.buildProduct();
    	}
    }


     

    建造者模式最基本的功能是基本方法的调用顺序安排。也就是说说这些基本方法已经实现了。通俗地说就是零件的装配。顺序不同,产生的对象也不同。而工厂方法则重点是创建,创建零件是它的主要职责,组装顺序不是它关心的。

    一个完整的类图:

    代码:

    abstract class CarBuilder {
    	// 建造一个模型 就是组装顺序
    	public abstract void setSequence(ArrayList<String> sequence);
    
    	public abstract CarModel getCarModel();
    }
    
    class BenzBuilder extends CarBuilder {
    
    	private BenzModel benz = new BenzModel();
    
    	@Override
    	public void setSequence(ArrayList<String> sequence) {
    		this.benz.setSequence(sequence);
    	}
    
    	@Override
    	public CarModel getCarModel() {
    		return this.benz;
    	}
    }
    
    class BMWBuilder extends CarBuilder {
    
    	private BMWModel bmw = new BMWModel();
    
    	@Override
    	public void setSequence(ArrayList<String> sequence) {
    		this.bmw.setSequence(sequence);
    	}
    
    	@Override
    	public CarModel getCarModel() {
    		return this.bmw;
    	}
    
    }
    
    abstract class CarModel {
    	private ArrayList<String> sequence = new ArrayList();
    
    	protected abstract void start();
    
    	protected abstract void stop();
    
    	protected abstract void alarm();
    
    	protected abstract void engineBoom();
    
    	final public void run() {
    		for (int i = 0; i < sequence.size(); i++) {
    			String actionName = this.sequence.get(i);
    			if (actionName.equalsIgnoreCase("start")) {
    				this.start();
    			} else if (actionName.equalsIgnoreCase("stop")) {
    				this.stop();
    			} else if (actionName.equalsIgnoreCase("alarm")) {
    				this.alarm();
    			} else if (actionName.equalsIgnoreCase("engine Boom")) {
    				this.engineBoom();
    			}
    		}
    	}
    
    	final public void setSequence(ArrayList<String> sequence) {
    		this.sequence = sequence;
    	}
    }
    
    class BenzModel extends CarModel {
    
    	@Override
    	protected void start() {
    		System.out.println("奔驰---->启动");
    	}
    
    	@Override
    	protected void stop() {
    		System.out.println("奔驰---->停止");
    	}
    
    	@Override
    	protected void alarm() {
    		System.out.println("奔驰---->喇叭响");
    	}
    
    	@Override
    	protected void engineBoom() {
    		System.out.println("奔驰---->引擎的响");
    	}
    
    }
    
    class BMWModel extends CarModel {
    
    	@Override
    	protected void start() {
    		System.out.println("宝马---->启动");
    	}
    
    	@Override
    	protected void stop() {
    		System.out.println("宝马---->停止");
    	}
    
    	@Override
    	protected void alarm() {
    		System.out.println("宝马---->喇叭响");
    	}
    
    	@Override
    	protected void engineBoom() {
    		System.out.println("宝马---->引擎的响");
    	}
    
    }
    
    class Director {
    	private ArrayList<String> sequence = new ArrayList<String>();
    	private BenzBuilder benzBuilder = new BenzBuilder();
    	private BMWBuilder bmwBuilder = new BMWBuilder();
    
    	public BenzModel getABenzModel() {
    		this.sequence.clear();
    		this.sequence.add("start");
    		this.sequence.add("stop");
    		this.benzBuilder.setSequence(sequence);
    		return (BenzModel) this.benzBuilder.getCarModel();
    	}
    
    	public BenzModel getBBenzModel() {
    		this.sequence.clear();
    		this.sequence.add("engine boom");
    		this.sequence.add("start");
    		this.benzBuilder.setSequence(sequence);
    		return (BenzModel) this.benzBuilder.getCarModel();
    	}
    
    	public BMWModel getCBmwModel() {
    		this.sequence.clear();
    		this.sequence.add("alarm");
    		this.sequence.add("start");
    		this.sequence.add("stop");
    		this.bmwBuilder.setSequence(sequence);
    		return (BMWModel) this.bmwBuilder.getCarModel();
    
    	}
    
    	public BMWModel getDBmwModel() {
    		this.sequence.clear();
    		this.sequence.add("start");
    		this.bmwBuilder.setSequence(sequence);
    		return (BMWModel) this.bmwBuilder.getCarModel();
    
    	}
    }
    
    public class Client {
    
    	public static void main(String[] args) {
    		Director director = new Director();
    		System.out.println("---------------------------------------");
    		for (int i = 0; i < 10; i++) {
    			System.out.print( (i + 1)+"+");
    			director.getABenzModel().run();
    
    		}
    		System.out.println("---------------------------------------");
    		for (int i = 0; i < 5; i++) {
    			System.out.print( (i + 1)+"+");
    			director.getBBenzModel().run();
    		}
    		System.out.println("---------------------------------------");
    		for (int i = 0; i < 10; i++) {
    			System.out.print( (i + 1)+"+");
    			director.getCBmwModel().run();
    		}
    		System.out.println("---------------------------------------");
    		for (int i = 0; i < 5; i++) {
    			System.out.print( (i + 1)+"+");
    			director.getDBmwModel().run();
    		}
    	}
    }
    


     

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  • 原文地址:https://www.cnblogs.com/liguangsunls/p/6759349.html
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