设计模式——模板方法模式

说明

示例

下面看下模板方法模式的代码实现

abstract class AbstractCalculator{
    public final function calculate(string $exp,string $opt){
        $arr = $this->split($exp,$opt);
        return $this->cal($arr[0],$arr[1]);
    }

    abstract public function cal(int $num1, int $num2): int;

    public function split(string $exp, string $opt): array{
        $arr = explode($opt,$exp);
        return [intval($arr[0]),intval($arr[1])];
    }
}

class Plus extends AbstractCalculator{
    public function cal(int $num1, int $num2): int{
        return $num1 + $num2;
    }
}


// 调用
$exp = '2+8';
$cal = new Plus();
$result = $cal->calculate($exp, '+');
echo $result;
abstract class AbstractCalculator{
    public final function calculate(string $exp,string $opt){
        $arr = $this->split($exp,$opt);
        return $this->cal($arr[0],$arr[1]);
    }

    abstract public function cal(int $num1, int $num2): int;

    public function split(string $exp, string $opt): array{
        $arr = explode($opt,$exp);
        return [intval($arr[0]),intval($arr[1])];
    }
}

class Plus extends AbstractCalculator{
    public function cal(int $num1, int $num2): int{
        return $num1 + $num2;
    }
}


// 调用
$exp = '2+8';
$cal = new Plus();
$result = $cal->calculate($exp, '+');
echo $result;
// output:  10

总结