Wakati mbinu zako za kurudi aina za kawaida, wewe kuharibu mstari wa wito 
 
 TL;DR: Kuepuka mbinu ambazo hutoa Object, Any, au null badala ya aina fulani. TL;DR: Kuepuka mbinu ambazo hutoa Object, Any, au null badala ya aina fulani. matatizo ya 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Uharibifu wa Polymorphism Kuunganisha kwa karibu Uchunguzi wa kutosha wa null Urefu wa kurudi Msimbo mkali wa Ni vigumu kujaribu Usalama wa aina ya kupoteza Uchafuzi wa IFS Uharibifu wa polymorphism Makosa ya Runtime Mkataba usio wazi Utafiti wa matatizo Uhifadhi mbaya ufumbuzi wa 
 
 
 
 
 
 
 
 
 Jinsi ya kurudi polymorphic Jinsi ya kutumia Null Object Pattern Kuepuka kurudi kwa mtu yeyote Kutoa mapendekezo kwa ajili ya makosa Ufafanuzi kwa ajili ya Clarity Kurudi aina maalum au interface Tumia abstractions sahihi Kuunda vitu vya maana Mabadiliko ya mwaka ️ https://hackernoon.com/code-refactoring-tips-no-015-remove-null?embedable=true Muhtasari wa Wakati wa kuandika mbinu ambayo inaweza kurudi aina nyingi, kama vile au kwa Wewe ni kupoteza polymorphism. yoyote ya ya null ya null Polymorphism inaruhusu kutibu vitu ambavyo vinashiriki interface au aina ya msingi kwa kubadilishana, kufafanua msimbo wako. Kurejesha null huwafanya wito wako kuandika checks za ziada na kushughulikia kesi maalum, ambayo huchanganya msimbo na huongeza kuunganisha. Kurudi yoyote (au aina ambayo huondoa taarifa ya aina halisi) inafanya kuwa vigumu kuelewa ni nini mbinu halisi kurudi, kusababisha bugs na mchanganyiko. Unahitaji kuwa na uhakika wa kufanya utafiti wa aina na . ya casting Hii inaangamia kanuni ya msingi ya polymorphism ambapo vitu vinapaswa kutenda kulingana na . Mkataba wa Njia inapaswa kurejesha aina maalum ambazo zinawasiliana wazi na nia zao na kuruhusu compiler kuthibitisha usahihi wakati wa kuunganisha. Kumbuka 
 
 Njia mbili ni polymorphic ikiwa saini zao ni sawa, maneno ni polymorphic, na kurudi pia ni polymorphic. Njia mbili ni polymorphic ikiwa saini zao ni sawa, maneno ni polymorphic, na kurudi pia ni . polymorphic Kodi ya sampuli Hakuna makosa ya public class DatabaseConnection {
    public Object execute(String sql) {
        if (sql.startsWith("SELECT")) {
            return new ResultSet();
        } else if (sql.startsWith("INSERT")) {
            return Integer.valueOf(42);
        } else if (sql.startsWith("UPDATE")) {
            return Boolean.TRUE;
        }
        return null;
        // The billion dollar mistake
    }
}

public class QueryHandler {
    public void handle(String sql, DatabaseConnection db) {
        Object result = db.execute(sql);
        // The caller needs to be aware of many different types
        if (result instanceof ResultSet) {
            System.out.println("Fetched rows");
        } else if (result instanceof Integer) {
            System.out.println("Inserted " + result);
        } else if (result instanceof Boolean) {
            System.out.println("Updated " + result);
        } else {
            System.out.println("Unknown result");
        }
    }
}

// This second class has a method execute()
// which is NOT polymorphic since it returns 
// another types
public class NonRelationalDatabaseConnection {
    public Object execute(String query) {
        if (query.startsWith("FIND")) {
            return new Document();
        } else if (query.startsWith("INSERT")) {
            return Integer.valueOf(1);
        } else if (query.startsWith("UPDATE")) {
            return Boolean.TRUE;
        }
        return null; // The billion dollar mistake
    }
}
 Kwa kweli interface QueryResult {
    void display();
}

class SelectResult implements QueryResult {
    public void display() {
        System.out.println("Fetched rows");
    }
}

class InsertResult implements QueryResult {
    private final int count;
    InsertResult(int count) { this.count = count; }
    public void display() {
        System.out.println("Inserted " + count);
    }
}

class UpdateResult implements QueryResult {
    private final boolean ok;
    UpdateResult(boolean ok) { this.ok = ok; }
    public void display() {
        System.out.println("Updated " + ok);
    }
}

class DocumentResult implements QueryResult {
    public void display() {
        System.out.println("Fetched documents");
    }
}

interface DatabaseConnection {
    QueryResult execute(String query);
}

public class RelationalDatabaseConnection 
  implements DatabaseConnection {
    public QueryResult execute(String sql) {
        // execute() is now polymorphic and returns a QueryResult
        if (sql.startsWith("SELECT")) {
            return new SelectResult();
        } else if (sql.startsWith("INSERT")) {
            return new InsertResult(42);
        } else if (sql.startsWith("UPDATE")) {
            return new UpdateResult(true);
        }
        // You remove null
        throw new IllegalArgumentException("Unknown SQL");
    }
}

public class NonRelationalDatabaseConnection 
  implements DatabaseConnection {
    public QueryResult execute(String query) {
        // execute() is now polymorphic and returns a QueryResult
        if (query.startsWith("FIND")) {
            return new DocumentResult();
        } else if (query.startsWith("INSERT")) {
            return new InsertResult(1);
        } else if (query.startsWith("UPDATE")) {
            return new UpdateResult(true);
        }
        throw new IllegalArgumentException("Unknown query");
    }
}

public class QueryHandler {
    public void handle(String sql, DatabaseConnection db) {
        QueryResult result = db.execute(sql);
        result.display();
    }
}
 Utambulisho wa 
 
 Nusu ya moja kwa moja Angalia mbinu ambazo zina aina za kurudi kama Object, Any, void*, au kurudi kwa mara kwa mara. Pia angalia kwa ajili ya udhibiti wa if-null au udhibiti wa aina baada ya wito wa mbinu. Zana na uchambuzi wa static wakati mwingine huonya kuhusu mbinu za kurudi yoyote au null bila nyaraka. Utafutaji wa mifano ya udhibiti au aina ya uchafuzi baada ya wito wa njia. Angalia mbinu ambazo hutoa aina tofauti kulingana na vigezo au hali yao ya ndani. Mifano ya 
 
 
 Mfumo wa Mkusanyiko wa Generic Maktaba ya Serialization Tarehe ya ️ 
 
 Polymorphism ya Kiwango cha 
 
 wa kati Kwa nini ni muhimu kwa ajili ya mazoezi ️ Wakati mbinu daima kurudi aina ambayo inafanana na dhana ambayo inawakilisha, programu hauhitaji kesi maalum. Kuanguka kwa hii kwa kurejesha yoyote au null huunda utambulisho. Bijection ya Msimbo wa wito unapaswa kufikiria aina halisi au kukabiliana na nulls, kuongezeka kwa makosa na gharama ya matengenezo. Vitu vyote vina tabia na tabia maalum. Ulimwengu wa kweli Mwisho wa kizazi Jenereta za AI wakati mwingine hutoa mbinu za kurudi chochote au null kwa sababu wanapendekeza urahisi au urahisi juu ya kuandika nguvu na polymorphism. Utafiti wa Zana za AI zinaweza kurekebisha ladha hii wakati wa kutoa maagizo ya kutekeleza kurudi zilizotajwa na kupendekeza au mifano ya chaguzi. Chini ya Object Wanaweza refactor null kurudi katika polymorphic kurudi hierarchies moja kwa moja kama kuongozwa. Maombi rahisi kuhusu "kuimarisha aina za kurudi" mara nyingi husaidia AI kupendekeza mbadala bora. Tafadhali jaribu! Kumbuka: Msaidizi wa AI hufanya makosa mengi 
 
 Prompt iliyopendekezwa: Kubadilisha mbinu za kurudi Object, Any, au null na aina maalum za kurudi. Kujenga abstractions sahihi na mifano ya kitu cha null. kuhakikisha usalama wa aina na mikataba ya wazi Prompt iliyopendekezwa: Kubadilisha mbinu za kurudi Object, Any, au null na aina maalum za kurudi. Kujenga abstractions sahihi na mifano ya kitu cha null. kuhakikisha usalama wa aina na mikataba ya wazi 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Without Proper Instructions 
 With Specific Instructions 
 
 
 
 ChatGPT 
 ChatGPT 
 
 
 
 Claude 
 Claude 
 
 
 
 Perplexity 
 Perplexity 
 
 
 
 Copilot 
 Copilot 
 
 
 
 You 
 You 
 
 
 
 Gemini 
 Gemini 
 
 
 
 DeepSeek 
 DeepSeek 
 
 
 
 Meta AI 
 Meta AI 
 
 
 
 Grok 
 Grok 
 
 
 
 Qwen 
 Qwen Mchezo wa Mchezo wa Claude wa Claude wa wasiwasi wasiwasi Mtoto wa Mtoto wa wewe mwenyewe wewe mwenyewe wa Gemini wa Gemini Utafutaji wa Utafutaji wa Malengo ya AI Malengo ya AI Kijani Kijani Kwenye Kwenye Mwisho wa Njia inapaswa kurejesha aina maalum ambazo zinawasiliana kwa uwazi na madhumuni yao na kuwezesha ukaguzi wa muda wa compile. Unapoweza kubadilisha kurudi zisizo za polymorphic na abstractions sahihi, unajenga msimbo salama zaidi, unaohifadhiwa zaidi ambao unaonyesha nia yake kwa uwazi. Ujumbe wako https://hackernoon.com/how-to-find-the-stinky-parts-of-your-code-part-ix-7rr33ol https://hackernoon.com/how-to-find-the-stinky-parts-of-your-code-part-iii-t7h3zkv https://hackernoon.com/how-to-find-the-stinky-parts-of-your-code-part-iii-t7h3zkv https://hackernoon.com/how-to-find-the-stinky-parts-of-your-code-part-ix-7rr33ol https://hackernoon.com/how-to-find-the-stinky-parts-of-your-code-part-xxvi Maelezo zaidi https://hackernoon.com/how-to-get-rid-of-annoying-ifs-forever-zuh3zlo?embedable=true https://hackernoon.com/null-the-billion-dollar-mistake-8t5z32d6?embedable=true https://en.wikipedia.org/wiki/Design_by_contract?embedable=true Maelezo ya Disclaimer Hifadhi ya Hifadhi ni ya Mimi . Maoni ya Mkopo wa Picha ya ya Maoni ya Randy Fath Usiku wa 
 
 Kurejea aina sahihi, daima. Kurejea aina sahihi, daima. Brian wa Goetz https://hackernoon.com/400-thought-provoking-software-engineering-quotes?embedable=true Makala hii ni sehemu ya mfululizo wa CodeSmell. https://hackernoon.com/how-to-find-the-stinky-parts-of-your-code-part-i-xqz3evd?embedable=true

Winner of Noonies 2020 for the award Hacker Noon Contributor of the Year - REFACTORING.

2020 - Hacker Noon Contributor of the Year in REFACTORING

2022 - HackerNoon Contributor of the Year - Clean Code

2022 - HackerNoon Contributor of the Year - Debugging

2022 - HackerNoon Contributor of the Year - Github

2022 - HackerNoon Contributor of the Year - Machine Learning

2022 - HackerNoon Contributor of the Year - Quality Assurance

2022 - HackerNoon Contributor of the Year - Refactoring

2022 - HackerNoon Contributor of the Year - Software Architecture

2022 - the Greatest Storyteller

Buy My Book

Share your ideas with me!

Read My Stories

Buy Me a Coffee

Software Engineer and Book Author

Sauti hii imetolewa katika lugha asilia ya hadithi!

Ndefu sana; Kusoma

Make resilience your competitive advantage

Hifadhi ya Kodi 308 - Chaguo la Hifadhi salama, safi, Polymorphic zaidi

Hifadhi ya Kodi 308 - Chaguo la Hifadhi salama, safi, Polymorphic zaidi

About Author

MAONI

HANG TAGS

MAKALA HII ILIWASILISHWA NDANI

Related Stories

Details of the Aerial Voyage.—Kennedy silenced

Sweet Security Unveils First Unified Detection And Response Platform

A PENDENT WORLD

#ellenBrain Turns a Long Weekend Into: HackerNoon Swag Around the World

Details of the Aerial Voyage.—Kennedy silenced

Sweet Security Unveils First Unified Detection And Response Platform

A PENDENT WORLD

#ellenBrain Turns a Long Weekend Into: HackerNoon Swag Around the World

Light-Mode

Classic

Newspaper

Dark-Mode

Neon Noir

Minty

HN StartUps