构建模式

构建模式的核心就是把构建和表示进行分离、解耦,如下例子:Part类代表一个复杂的需要构建的实体,其中有两个属性,代表需要的组件,Builder接口,用于表示需要构建的步骤方法,也可以理解为构建部分,Yw,Zw类表示不同的表示方式,也就是Part类在不同的情况下表现出来的不同view,Director类选择不同的Builder实现会得到不同的result给client,其中最核心的是Builder接口和Director类,通过这两个部件我们可以用不同的部件任意组合不同的Part给调用者。

package com.jerry.design.builder;

public class Part {
	private String name;
	
	private String code;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getCode() {
		return code;
	}

	public void setCode(String code) {
		this.code = code;
	}
	
    
}

package com.jerry.design.builder;

public interface Builder {
	
	public void builderPartA(Part p);
	
	public void builderPartB(Part p);
	
	public String getResult();
}
package com.jerry.design.builder;

public class Director {
	
	private Builder bulider;

	public void setBulider(Builder bulider) {
		this.bulider = bulider;
	}
	
	public String doSomething(Part p){
		bulider.builderPartA(p);
		bulider.builderPartB(p);
		return bulider.getResult();
	}

}
package com.jerry.design.builder;

public class Yw implements Builder{
	
	private StringBuffer result = new StringBuffer("english:");

	@Override
	public void builderPartA(Part p) {
		result.append(p.getName());
	}

	@Override
	public void builderPartB(Part p) {
		result.append(p.getCode());
	}

	@Override
	public String getResult() {
		return result.toString();
	}

}
package com.jerry.design.builder;

public class Zw implements Builder{
	
	private StringBuffer result = new StringBuffer("中文:");

	@Override
	public void builderPartA(Part p) {
		result.append(p.getName());
	}

	@Override
	public void builderPartB(Part p) {
		result.append(p.getCode());
	}
	
	@Override
	public String getResult() {
		return result.toString();
	}

}

package com.jerry.design.builder;

public class Client {
	
	public static void main(String[] args) {
		Part p = new Part();
		p.setName("我的名字");
		p.setCode("我的代码");
		Zw zw = new Zw();
		Director dir = new Director();
		dir.setBulider(zw);
		System.out.println(dir.doSomething(p));
		
	}

}






你可能感兴趣的:(模式)