PHP策略设计模式

';
}
}

/**
* 具体策略角色B
*/
class ConcreteStrategyB implements Strategy {

public function algorithmInterface() {
echo 'algorithmInterface B
';
}
}

/**
* 具体策略角色C
*/
class ConcreteStrategyC implements Strategy {

public function algorithmInterface() {
echo 'algorithmInterface C
';
}
}

/**
* 环境角色
*/
class Context {
/* 引用的策略 */
private $_strategy;

public function __construct(Strategy $strategy) {
$this->_strategy = $strategy;
}

public function contextInterface() {
$this->_strategy->algorithmInterface();
}

}

/**
* 客户端
*/
class Client {

/**
* Main program.
*/
public static function main() {
$strategyA = new ConcreteStrategyA();
$context = new Context($strategyA);
$context->contextInterface();

$strategyB = new ConcreteStrategyB();
$context = new Context($strategyB);
$context->contextInterface();

$strategyC = new ConcreteStrategyC();
$context = new Context($strategyC);
$context->contextInterface();
}

}

Client::main();
?>

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