PHP somo la 56:class interface na polymorphism kwenye PHP OOP

Katika somo hili utakwenda kujifunza concept ya interface na concept ya polymorphism kwenye PHP OOP.

Interface ni nini?

Interface inafanana na abstract na hata ufanyaji kazi wake ila kuna utofauti kadhaa yutakuja kuuona hapo chini. Interface hasa yenewe hasa inarahisisha kwa class zaidi ya moja kufanya kazi sawa. Ikiwa kuna class zaidi ya moja zimetumia interface moja hii huulikana kama polymorphism.

Ili tuweze kutengeneza class yenye interface tutatumia keyword interface na ili kuitumia hiyo class yenye interface tutatumia keyword implement. Angalia mfano hapo chini:-

<?php

Interface gari {

}

class tangazo implements gari {

}

Utaona hapo kuna class mbili, ya kwanza ni gari na ya pili ni tangazo. Sasa class gari ndio ina interface na class tangazo inatumia interface ndio utaona hapo tmetumia keyword implement. Sasa hicho kitendo cha kutumia interface kwenye class nyingine ndio kinaitwa polymorphism.

<?php

Interface gari {

public function jina();

public function speed();

}

class tangazo implements gari {

public function jina() {

echo "Jina la gari ni toyota".'<br>';

}

public function speed(){

echo "speed ni 180 km/h";

}

echo "Tunauza gari <br>";

$obj = new tangazo();

$obj->jina();

$obj->speed();

Utofauti kati ya insterface na abstract

Interface haiwezi kuwa na property ambapo abstract inaweza kuwa
Method zote za kwenye interface ni public ila kwenye abstract ni protected ama public
Metod zote kwenye interface ni abstract ijapokuwa hakuna kutumia keyword abstract
Class inaweza kutumia interface na hata kama itakuwa imerithi kutoka kwenye class nyingine.

Angalia mfano mwingine hapo chini

<?php
interface mnyama
{

    public function analiaje();

}

class mbuzi implements mnyama
{

    public function analiaje()
    {
        echo " Meee ";
    }
}


class paka implements mnyama
{
    public function analiaje()
    {
        echo">

...

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Author: Rajabu

Tarehe: 1970-01-01 03:33:44 Topic: PHP Main: ICT File: Download PDF Views 427

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