{"id":2799,"date":"2026-06-25T23:01:46","date_gmt":"2026-06-26T02:01:46","guid":{"rendered":"https:\/\/infodiversao.com\/?p=2799"},"modified":"2026-06-25T23:01:59","modified_gmt":"2026-06-26T02:01:59","slug":"agregacao-e-composicao-em-java","status":"publish","type":"post","link":"https:\/\/infodiversao.com\/index.php\/2026\/06\/25\/agregacao-e-composicao-em-java\/","title":{"rendered":"Agrega\u00e7\u00e3o e Composi\u00e7\u00e3o em Java"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Relacionamentos entre objetos<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Em Programa\u00e7\u00e3o Orientada a Objetos, uma classe pode utilizar outra classe.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Existem diferentes tipos de relacionamento.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Os dois mais importantes s\u00e3o:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Agrega\u00e7\u00e3o<\/li>\n\n\n\n<li>Composi\u00e7\u00e3o<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Embora pare\u00e7am semelhantes, eles possuem diferen\u00e7as importantes.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Agrega\u00e7\u00e3o<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Na agrega\u00e7\u00e3o, um objeto utiliza outro, mas ambos podem existir independentemente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Se um objeto for destru\u00eddo, o outro continua existindo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c9 conhecida como rela\u00e7\u00e3o &#8220;tem um&#8221; (has-a).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Exemplo<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Uma universidade possui professores.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Se a universidade fechar, os professores continuam existindo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Diagrama:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Universidade\n      |\n      |------ Professor<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Implementa\u00e7\u00e3o<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Classe Professor<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Professor {\n\n    private String nome;\n\n    public Professor(String nome){\n        this.nome = nome;\n    }\n\n    public String getNome(){\n        return nome;\n    }\n\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Classe Universidade<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Universidade {\n\n    private Professor professor;\n\n    public Universidade(Professor professor){\n        this.professor = professor;\n    }\n\n    public void mostrarProfessor(){\n        System.out.println(professor.getNome());\n    }\n\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Uso:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Professor p = new Professor(\"Carlos\");\n\nUniversidade u = new Universidade(p);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">O professor continua existindo mesmo que a universidade deixe de existir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Composi\u00e7\u00e3o<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Na composi\u00e7\u00e3o, um objeto depende totalmente do outro.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quando o objeto principal deixa de existir, seus componentes tamb\u00e9m deixam de existir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c9 uma rela\u00e7\u00e3o muito mais forte.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Exemplo<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Uma casa possui quartos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u00e3o existe um quarto pertencente \u00e0quela casa sem que a pr\u00f3pria casa exista.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Diagrama<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Casa\n  |\n  |------ Quarto<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Implementa\u00e7\u00e3o<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Classe Quarto<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Quarto {\n\n    private String nome;\n\n    public Quarto(String nome){\n        this.nome = nome;\n    }\n\n    public String getNome(){\n        return nome;\n    }\n\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Classe Casa<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Casa {\n\n    private Quarto quarto;\n\n    public Casa(){\n        quarto = new Quarto(\"Su\u00edte\");\n    }\n\n    public void mostrar(){\n        System.out.println(quarto.getNome());\n    }\n\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Observe que o quarto \u00e9 criado dentro da casa.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O usu\u00e1rio n\u00e3o cria um objeto Quarto separadamente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Diferen\u00e7as entre Agrega\u00e7\u00e3o e Composi\u00e7\u00e3o<\/h1>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Caracter\u00edstica<\/td><td>Agrega\u00e7\u00e3o<\/td><td>Composi\u00e7\u00e3o<\/td><\/tr><tr><td>Rela\u00e7\u00e3o<\/td><td>Fraca<\/td><td>Forte<\/td><\/tr><tr><td>Objetos independentes<\/td><td>Sim<\/td><td>N\u00e3o<\/td><\/tr><tr><td>Compartilhamento<\/td><td>Sim<\/td><td>N\u00e3o<\/td><\/tr><tr><td>Ciclo de vida<\/td><td>Independente<\/td><td>Dependente<\/td><\/tr><tr><td>Exemplo<\/td><td>Universidade e Professor<\/td><td>Casa e Quarto<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Exemplos do cotidiano<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Agrega\u00e7\u00e3o<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Empresa \u2192 Funcion\u00e1rio<\/li>\n\n\n\n<li>Time \u2192 Jogador<\/li>\n\n\n\n<li>Escola \u2192 Professor<\/li>\n\n\n\n<li>Biblioteca \u2192 Livro<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Todos podem existir separadamente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Composi\u00e7\u00e3o<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Casa \u2192 Quarto<\/li>\n\n\n\n<li>Carro \u2192 Motor<\/li>\n\n\n\n<li>Computador \u2192 Placa-m\u00e3e<\/li>\n\n\n\n<li>Livro \u2192 Cap\u00edtulos<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">As partes dependem do objeto principal.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"953\" height=\"630\" src=\"https:\/\/infodiversao.com\/wp-content\/uploads\/2026\/06\/image.png\" alt=\"\" class=\"wp-image-2800\" srcset=\"https:\/\/infodiversao.com\/wp-content\/uploads\/2026\/06\/image.png 953w, https:\/\/infodiversao.com\/wp-content\/uploads\/2026\/06\/image-300x198.png 300w, https:\/\/infodiversao.com\/wp-content\/uploads\/2026\/06\/image-768x508.png 768w\" sizes=\"auto, (max-width: 953px) 100vw, 953px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Relacionamentos entre objetos Em Programa\u00e7\u00e3o Orientada a Objetos, uma classe pode utilizar outra classe. Existem diferentes tipos de relacionamento. Os dois mais importantes s\u00e3o: Embora pare\u00e7am semelhantes, eles possuem diferen\u00e7as importantes. Agrega\u00e7\u00e3o Na agrega\u00e7\u00e3o, um objeto utiliza outro, mas ambos podem existir independentemente. Se um objeto for destru\u00eddo, o outro continua existindo. \u00c9 conhecida como [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2801,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[162,153],"tags":[],"class_list":["post-2799","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","category-programacao"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Agrega\u00e7\u00e3o e Composi\u00e7\u00e3o em Java - Infodiversao<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/infodiversao.com\/index.php\/2026\/06\/25\/agregacao-e-composicao-em-java\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Agrega\u00e7\u00e3o e Composi\u00e7\u00e3o em Java - Infodiversao\" \/>\n<meta property=\"og:description\" content=\"Relacionamentos entre objetos Em Programa\u00e7\u00e3o Orientada a Objetos, uma classe pode utilizar outra classe. Existem diferentes tipos de relacionamento. Os dois mais importantes s\u00e3o: Embora pare\u00e7am semelhantes, eles possuem diferen\u00e7as importantes. Agrega\u00e7\u00e3o Na agrega\u00e7\u00e3o, um objeto utiliza outro, mas ambos podem existir independentemente. 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