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概念:某实体的复杂功能与实体进行分离,并且这个复杂功能具有多样性.
例如:衣服制造厂(实体)有制造衣服的功能,每种衣服的制造流程都不相同,因此把制造衣服这个复杂且可变的功能分离出来.
使用场景:实体的某个功能复杂且不只有一种
好处:功能的扩展不影响实体,实体更加内聚,与可变的部分耦合度低
实例:
//生产过程接口
package note.com.builder; public interface Builder { public String build(Factory factory); }
//生产1过程
package note.com.builder; public class Builder1 implements Builder{ public String build(Factory factory) { String clothes = factory.getOne1()+factory.getTwo2()+factory.getThree1()+factory.getFour1(); return clothes; } }
//生产2过程
package note.com.builder; public class Builder2 implements Builder{ public String build(Factory factory) { String clothes = factory.getOne2()+factory.getTwo1()+factory.getFour1(); return clothes; } }
//衣服工厂实体
package note.com.builder; public class Factory { private String one1 = "纺织布"; private String one2 = "尼龙布"; private String two1 = "裁剪"; private String two2 = "上色"; private String three1 = "加领"; private String four1 = "缝合"; public String build(Builder builder){ String clothes = builder.build(this); System.out.println("生产过程:"+clothes); return clothes; } public String getOne1() { return one1; } public void setOne1(String one1) { this.one1 = one1; } public String getOne2() { return one2; } public void setOne2(String one2) { this.one2 = one2; } public String getTwo1() { return two1; } public void setTwo1(String two1) { this.two1 = two1; } public String getTwo2() { return two2; } public void setTwo2(String two2) { this.two2 = two2; } public String getThree1() { return three1; } public void setThree1(String three1) { this.three1 = three1; } public String getFour1() { return four1; } public void setFour1(String four1) { this.four1 = four1; } }
//测试类
package note.com.builder; public class BuilderTest { public static void main(String[] args) { Factory factory = new Factory(); Builder builder1 = new Builder1(); Builder builder2 = new Builder2(); factory.build(builder1); factory.build(builder2); } }
//结果
生产过程:纺织布上色加领缝合
生产过程:尼龙布裁剪缝合
由此,工厂的生产过程与工厂进行分离,并且每次增加新衣服的生产都只需要增加Builder的实现就可以了.
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原文地址：http://www.cnblogs.com/qinggege/p/5230718.html
