在java中使用数百个if else实现业务规则的设计模式
在java中使用数百个if else实现业务规则的设计模式
提问于 2013-05-31 12:15:48
我必须用数百行下面的代码来实现某些业务规则
if this
then this
else if
then this
.
. // hundreds of lines of rules
else
that我们是否有任何设计模式可以有效地实现这一点，或者重用代码，以便它可以应用于所有不同的规则。我听说过Specification Pattern，它创建了下面这样的东西
public interface Specification {
boolean isSatisfiedBy(Object o);
Specification and(Specification specification);
Specification or(Specification specification);
Specification not(Specification specification);
}
public abstract class AbstractSpecification implements Specification {
public abstract boolean isSatisfiedBy(Object o);
public Specification and(final Specification specification) {
return new AndSpecification(this, specification);
}
public Specification or(final Specification specification) {
return new OrSpecification(this, specification);
}
public Specification not(final Specification specification) {
return new NotSpecification(specification);
}
}然后实现Is，And，Or方法，但我认为这不能避免我编写if else(可能是我的理解不正确)……
有没有最好的方法来实现有这么多if else语句的业务规则？
编辑:只是一个示例。A，B，C等都是class.Apart的属性。还有很多类似的其他规则。我想为这个做一个泛型代码。
If <A> = 'something' and <B> = ‘something’ then
If <C> = ‘02’ and <D> <> ‘02’ and < E> <> ‘02’ then
'something'
Else if <H> <> ‘02’ and <I> = ‘02’ and <J> <> ‘02’ then
'something'
Else if <H> <> ‘02’ and <I> <> ‘02’ and <J> = ‘02’ then
'something'
Else if <H> <> ‘02’ and <I> = ‘02’ and <J> = ‘02’ then
'something'
Else if <H> = ‘02’ and <I> = ‘02’ and <J> <> ‘02’ then
'something'
Else if <H> = ‘02’ and <I> <> ‘02’ and <J> = ‘02’ then
'something'
Else if <H> = ‘02’ and <I> = ‘02’ and <J> = ‘02’ then:
If <Q> = Y then
'something'
Else then
'something'
Else :
Value of <Z>页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/16849656
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