Constructor overloading Java and PHP5

nowel (hata) — Thu, 04 Jan 2007 15:39:12 GMT

Java's constructor overload



class Hoge {



    public Hoge(){

        System.out.println("constructor 0");

    }



    public Hoge(int a){

        System.out.println("constructor 1:" + a);

    }



    public Hoge(int a, String[] hoge){

        System.out.println("constructor 2:" + a + ":" + hoge);

    }



    public Hoge(A a, B b, C c){

        System.out.println("constructor 3:" + a + ":" + b + ":" + c);

    }

}

PHP5 code



class Hoge {



    public function __construct(){

        $num = func_num_args();

        $args = func_get_args();

        switch($num){

        case 0:

            $this->__call('__construct0', null);

            break;

        case 1:

            $this->__call('__construct1', $args);

            break;

        case 2:

            $this->__call('__construct2', $args);

            break;

        case 3:

            $this->__call('__construct3', $args);

            break;

        default:

            throw new Exception();

        }

    }



    public function __construct0(){

        echo "constructor 0" . PHP_EOL;

    }



    public function __construct1($a){

        echo "constructor 1: " . $a . PHP_EOL;

    }



    public function __construct2($a, array $hoge){

        echo "constructor 2: " . $a . PHP_EOL;

        var_dump($hoge);

    }



    public function __construct3(A $a, A $b, C $c){

        echo "constructor 3: " . PHP_EOL;

        var_dump($a, $b, $c);

    }



    private function __call($name, $arg){

        return call_user_func_array(array($this, $name), $arg);

    }

}

example(PHP5)



interface C {

    const C = __CLASS__;

}

class A {

    const A = __CLASS__;

    private $a = array(1, 2, 3);

}

class B extends A{

    const B = __CLASS__;

    private $b = array(1, 2, 3);

}

class D extends B implements C {

    const D = __CLASS__;

    private $c = array(1, 2, 3);

}



$a = new Hoge();

$b = new Hoge(1);

$c = new Hoge(777, array(1,2,3));

$d = new Hoge(new A(), new B(), new D());

DZone Snippets: method code

Constructor overloading Java and PHP5