{"id":27779,"date":"2024-05-29T09:36:31","date_gmt":"2024-05-29T07:36:31","guid":{"rendered":"https:\/\/www.codemotion.com\/magazine\/?p=27779"},"modified":"2024-05-29T09:36:33","modified_gmt":"2024-05-29T07:36:33","slug":"scopri-i-design-pattern-comportamentali","status":"publish","type":"post","link":"https:\/\/www.codemotion.com\/magazine\/it\/backend-it\/scopri-i-design-pattern-comportamentali\/","title":{"rendered":"Navigare la complessit\u00e0: scopri i design pattern comportamentali per un codice efficace"},"content":{"rendered":"\n<p>I design pattern comportamentali giocano un ruolo fondamentale nel determinare come gli oggetti interagiscono tra loro. Questi pattern non si limitano a descrivere modelli di oggetti o classi, <strong>ma si concentrano anche sui modelli di comunicazione tra di loro<\/strong> e infatti permettono di gestire il flusso di controllo complesso, facilitando la collaborazione tra oggetti e migliorando la leggibilit\u00e0 e la manutenibilit\u00e0 del codice.<br><br>I <strong>pattern comportamentali<\/strong> si suddividono in due categorie principali: pattern di classe comportamentali e pattern di oggetti comportamentali. I pattern di classe utilizzano l&#8217;ereditariet\u00e0 per distribuire il comportamento tra le classi, mentre i pattern di oggetti utilizzano la composizione di oggetti piuttosto che l&#8217;ereditariet\u00e0, promuovendo un accoppiamento lasco tra gli oggetti.<br><br>Procediamo ora con degli esempi partendo dai pattern di classe comportamentali.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-template-method\">Template Method<\/h3>\n\n\n\n<p>Il template method \u00e8 uno dei pattern di classe comportamentali pi\u00f9 semplici e comuni. Questo pattern definisce la struttura di un algoritmo in un metodo, delegando alcuni passaggi a sottoclassi e consente alle sottoclassi di ridefinire certi passaggi dell&#8217;algoritmo senza modificarne la struttura complessiva.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">abstract <span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">CaffeinaBeverage<\/span> <\/span>{\n    <span class=\"hljs-comment\">\/\/ Template method<\/span>\n    final <span class=\"hljs-keyword\">void<\/span> preparaRicetta() {\n        bolleAcqua();\n        prepara();\n        versaInTazza();\n        <span class=\"hljs-keyword\">if<\/span> (aggiungiCondimentiNecessari()) {\n            aggiungiCondimenti();\n        }\n    }\n\n    abstract <span class=\"hljs-keyword\">void<\/span> prepara();\n\n    abstract <span class=\"hljs-keyword\">void<\/span> aggiungiCondimenti();\n\n    <span class=\"hljs-keyword\">void<\/span> bolleAcqua() {\n        System.out.println(<span class=\"hljs-string\">\"Bollendo l'acqua\"<\/span>);\n    }\n\n    <span class=\"hljs-keyword\">void<\/span> versaInTazza() {\n        System.out.println(<span class=\"hljs-string\">\"Versando in tazza\"<\/span>);\n    }\n\n    <span class=\"hljs-comment\">\/\/ Hook method<\/span>\n    boolean aggiungiCondimentiNecessari() {\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">true<\/span>;\n    }\n}\n\n<span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Caffe<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title\">CaffeinaBeverage<\/span> <\/span>{\n    <span class=\"hljs-keyword\">void<\/span> prepara() {\n        System.out.println(<span class=\"hljs-string\">\"Preparando il caff\u00e8\"<\/span>);\n    }\n\n    <span class=\"hljs-keyword\">void<\/span> aggiungiCondimenti() {\n        System.out.println(<span class=\"hljs-string\">\"Aggiungendo zucchero e latte\"<\/span>);\n    }\n}\n\n<span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Te<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title\">CaffeinaBeverage<\/span> <\/span>{\n    <span class=\"hljs-keyword\">void<\/span> prepara() {\n        System.out.println(<span class=\"hljs-string\">\"Preparando il t\u00e8\"<\/span>);\n    }\n\n    <span class=\"hljs-keyword\">void<\/span> aggiungiCondimenti() {\n        System.out.println(<span class=\"hljs-string\">\"Aggiungendo limone\"<\/span>);\n    }\n}\n\npublic <span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Main<\/span> <\/span>{\n    public <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> main(<span class=\"hljs-built_in\">String<\/span>&#91;] args) {\n        CaffeinaBeverage caffe = <span class=\"hljs-keyword\">new<\/span> Caffe();\n        caffe.preparaRicetta();\n\n        CaffeinaBeverage te = <span class=\"hljs-keyword\">new<\/span> Te();\n        te.preparaRicetta();\n    }\n}\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Certo, ecco una spiegazione in 3 righe sul codice del Template Method:<\/p>\n\n\n\n<p>Il template method definisce la sequenza di passaggi per preparare una bevanda, delegando alle sottoclassi <code>Caffe<\/code> e <code>Te<\/code> l&#8217;implementazione dei dettagli specifici. Questo approccio permette di riutilizzare il codice comune (come bollire l&#8217;acqua e versare in tazza) e personalizzare i passaggi variabili (come la preparazione e l&#8217;aggiunta di condimenti).<\/p>\n\n\n\n<p>Passiamo ai pattern di oggetti comportamentali.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-strategy\">Strategy<\/h3>\n\n\n\n<p>Il <strong>pattern strategy<\/strong> consente di definire una famiglia di algoritmi, incapsularli e renderli intercambiabili. Questo pattern permette di selezionare l&#8217;algoritmo da utilizzare in modo dinamico a runtime.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-class\"><span class=\"hljs-keyword\">interface<\/span> <span class=\"hljs-title\">StrategiaPagamento<\/span> <\/span>{\n    void paga(int importo);\n}\n\n<span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">PagamentoCartaCredito<\/span> <span class=\"hljs-keyword\">implements<\/span> <span class=\"hljs-title\">StrategiaPagamento<\/span> <\/span>{\n    <span class=\"hljs-keyword\">private<\/span> String nome;\n    <span class=\"hljs-keyword\">private<\/span> String numeroCarta;\n\n    <span class=\"hljs-keyword\">public<\/span> PagamentoCartaCredito(String nome, String numeroCarta) {\n        this.nome = nome;\n        this.numeroCarta = numeroCarta;\n    }\n\n    @Override\n    <span class=\"hljs-keyword\">public<\/span> void paga(int importo) {\n        System.out.println(importo + <span class=\"hljs-string\">\"\u20ac pagati con carta di credito.\"<\/span>);\n    }\n}\n\n<span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">PagamentoPayPal<\/span> <span class=\"hljs-keyword\">implements<\/span> <span class=\"hljs-title\">StrategiaPagamento<\/span> <\/span>{\n    <span class=\"hljs-keyword\">private<\/span> String email;\n\n    <span class=\"hljs-keyword\">public<\/span> PagamentoPayPal(String email) {\n        this.email = email;\n    }\n\n    @Override\n    <span class=\"hljs-keyword\">public<\/span> void paga(int importo) {\n        System.out.println(importo + <span class=\"hljs-string\">\"\u20ac pagati con PayPal.\"<\/span>);\n    }\n}\n\n<span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">ContestoPagamento<\/span> <\/span>{\n    <span class=\"hljs-keyword\">private<\/span> StrategiaPagamento strategia;\n\n    <span class=\"hljs-keyword\">public<\/span> void setStrategia(StrategiaPagamento strategia) {\n        this.strategia = strategia;\n    }\n\n    <span class=\"hljs-keyword\">public<\/span> void eseguiPagamento(int importo) {\n        strategia.paga(importo);\n    }\n}\n\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Main<\/span> <\/span>{\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> void main(String&#91;] args) {\n        ContestoPagamento contesto = <span class=\"hljs-keyword\">new<\/span> ContestoPagamento();\n\n        contesto.setStrategia(<span class=\"hljs-keyword\">new<\/span> PagamentoCartaCredito(<span class=\"hljs-string\">\"Mario Rossi\"<\/span>, <span class=\"hljs-string\">\"1234-5678-9012-3456\"<\/span>));\n        contesto.eseguiPagamento(<span class=\"hljs-number\">100<\/span>);\n\n        contesto.setStrategia(<span class=\"hljs-keyword\">new<\/span> PagamentoPayPal(<span class=\"hljs-string\">\"mario.rossi@example.com\"<\/span>));\n        contesto.eseguiPagamento(<span class=\"hljs-number\">200<\/span>);\n    }\n}\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>L&#8217;interfaccia <code>StrategiaPagamento<\/code> definisce il metodo <code>paga<\/code>, mentre le classi <code>PagamentoCartaCredito<\/code> e <code>PagamentoPayPal<\/code> forniscono implementazioni specifiche di questo metodo. La classe <code>ContestoPagamento<\/code> utilizza un&#8217;istanza di <code>StrategiaPagamento<\/code> per eseguire il pagamento in base alla strategia selezionata. Nel metodo <code>main<\/code>, vengono creati due contesti di pagamento con diverse strategie e viene eseguito il pagamento con l&#8217;importo specificato.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-conclusioni-semplicita-ed-importanza-dei-design-pattern-comportamentali\">Conclusioni: semplicit\u00e0 ed importanza dei design pattern comportamentali<\/h3>\n\n\n\n<p>I design pattern comportamentali offrono soluzioni eleganti per gestire l&#8217;interazione complessa tra oggetti, migliorando la manutenibilit\u00e0 e la flessibilit\u00e0 del codice. La loro semplicit\u00e0 e capacit\u00e0 di risolvere problemi comuni nel design del software li rendono strumenti indispensabili per qualsiasi sviluppatore.<\/p>\n\n\n\n<p>Questo ultimo articolo completa la <a aria-label=\"saga dei design pattern (opens in a new tab)\" href=\"https:\/\/www.codemotion.com\/magazine\/it\/backend-it\/architettura-del-software\/codice-design-patterns\/\" target=\"_blank\" rel=\"noreferrer noopener\" class=\"ek-link\">saga dei design pattern<\/a>, offrendo un&#8217;approfondita esplorazione dei pattern comportamentali. <\/p>\n\n\n\n<p>Che tu sia un novizio o un esperto, spero che questa serie ti abbia ispirato e guidato verso l&#8217;eccellenza nello sviluppo software. Continua ad applicare queste conoscenze per creare soluzioni software innovative e di alta qualit\u00e0!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I design pattern comportamentali giocano un ruolo fondamentale nel determinare come gli oggetti interagiscono tra loro. Questi pattern non si limitano a descrivere modelli di oggetti o classi, ma si concentrano anche sui modelli di comunicazione tra di loro e infatti permettono di gestire il flusso di controllo complesso, facilitando la collaborazione tra oggetti e&#8230; <a class=\"more-link\" href=\"https:\/\/www.codemotion.com\/magazine\/it\/backend-it\/scopri-i-design-pattern-comportamentali\/\">Read more<\/a><\/p>\n","protected":false},"author":218,"featured_media":27924,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","_uag_custom_page_level_css":"","_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[10263],"tags":[11843],"collections":[12183,11708,12186,12189],"class_list":{"0":"post-27779","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-backend-it","8":"tag-design-pattern","9":"collections-clean-code-it","10":"collections-dalla-community","11":"collections-designpattern-it","12":"collections-java-it","13":"entry"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v26.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Scopri i design pattern comportamentali per un codice efficace<\/title>\n<meta name=\"description\" content=\"Strategie avanzate per migliorare l&#039;interazione e la comunicazione tra gli oggetti nel tuo software. 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