什么是策略模式
策略模式定义了一系列的算法，并将每一个算法封装起来，而且使它们还可以相互替换。策略模式让算法独立于使用它的客户而独立变化。
策略模式具体案列代码
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<?php abstract class Strategy { abstract public function AlgorithmInterface(); } class ConcreateStratA extends Strategy { public function AlgorithmInterface() { echo "算法A"; } } class ConcreateStratB extends Strategy { public function AlgorithmInterface() { echo "算法B"; } } class ConcreateStratC extends Strategy { public function AlgorithmInterface() { echo "算法C"; } } class Context { private $_StrObj; public function __construct($strobj) { $this->_StrObj = $strobj; } public function ContextInterface() { $this->_StrObj->AlgorithmInterface(); } } $context = new Context(new ConcreateStratA); $context->ContextInterface(); $context = new Context(new ConcreateStratC); $context->ContextInterface(); $context = new Context(new ConcreateStratB); $context->ContextInterface(); ?> |
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策略模式
