java策略模式教程

PHP 方式:

// 策略 interface Strategy{

public function doOperation(int $num1,int $num2):int ; 

}

// 加法 class OperationAdd implements Strategy{

public function doOperation(int $num1, int $num2): int { // TODO: Implement doOperation() method. return $num1 + $num2; } 

}

// 减法 class OperationSubtract implements Strategy{

public function doOperation(int $num1, int $num2): int { // TODO: Implement doOperation() method. return $num1-$num2; } 

}

// 乘法 class OperationMultiply implements Strategy{

public function doOperation(int $num1, int $num2): int { // TODO: Implement doOperation() method. return $num1 * $num2; } 

}

class Context{

private $_strategy; public function set_strategy($_strategy) { $this->_strategy = $_strategy; } public function executeStrategy(int $num1,int $num2){ return $this->_strategy->doOperation($num1,$num2); } 

} class Demo{

public static function main(){ $context = new Context(); $context->set_strategy(new OperationAdd()); echo "10 + 5 = ".$context->executeStrategy(10,5).PHP_EOL; $context->set_strategy(new OperationSubtract()); echo "10 - 5 = ".$context->executeStrategy(10,5).PHP_EOL; $context->set_strategy(new OperationMultiply()); echo "10 * 5 = ".$context->executeStrategy(10,5).PHP_EOL; } 

}

Demo::main();

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