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Как работает метод contains в hashset java — Q&A Хекслет
2026-02-26 18:22 Diff
https://ru.hexlet.io/qna/java/questions/kak-rabotaet-metod-contains-v-hashset-java
Конструкция contains в HashSet используется для проверки наличия элемента в данном наборе.
Вот пример использования метода contains:
HashSet<String> elements = new HashSet<>(); elements.add("foo"); elements.add("bar"); elements.add("baz"); if (elements.contains("foo")) { System.out.println("hashSet contains foo"); }
Здесь мы создаем новый объект HashSet и добавляем в него несколько строковых элементов. Затем мы проверяем, содержит ли набор строку "foo" с помощью метода contains. Если элемент присутствует, выводится сообщение "hashSet contains foo". Если элемент отсутствует, ничего не происходит.
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веб-разработке&quot;,&quot;slug&quot;:&quot;web_development&quot;,&quot;short_name&quot;:&quot;Веб-разработка&quot;,&quot;order&quot;:190,&quot;state&quot;:&quot;published&quot;,&quot;category_slug&quot;:&quot;courses_web_development&quot;},&quot;answerDto&quot;:{&quot;id&quot;:null,&quot;body&quot;:&quot;&quot;,&quot;meta&quot;:{&quot;model&quot;:&quot;question_answer&quot;,&quot;relations&quot;:{}}},&quot;question&quot;:{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:4,&quot;title&quot;:&quot;Java&quot;,&quot;slug&quot;:&quot;java&quot;,&quot;questions_count&quot;:931,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[],&quot;id&quot;:1050,&quot;answers_count&quot;:1,&quot;slug&quot;:&quot;kak-rabotaet-metod-contains-v-hashset-java&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;Как работает метод contains в hashset java\r&quot;,&quot;created_at&quot;:&quot;2021-11-23T11:30:17.350Z&quot;,&quot;details&quot;:null,&quot;best_answer_id&quot;:2662,&quot;related_stacks_count&quot;:5},&quot;answers&quot;:[{&quot;user&quot;:{&quot;id&quot;:576892,&quot;email&quot;:&quot;ammaddeuss@gmail.com&quot;,&quot;first_name&quot;:&quot;Иван&quot;,&quot;last_name&quot;:&quot;Полежаев&quot;,&quot;telegram&quot;:&quot;Ammaddeuss&quot;,&quot;full_name&quot;:&quot;Иван Полежаев&quot;,&quot;removed&quot;:false},&quot;question&quot;:{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:4,&quot;title&quot;:&quot;Java&quot;,&quot;slug&quot;:&quot;java&quot;,&quot;questions_count&quot;:931,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[],&quot;id&quot;:1050,&quot;answers_count&quot;:1,&quot;slug&quot;:&quot;kak-rabotaet-metod-contains-v-hashset-java&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;Как работает метод contains в hashset java\r&quot;,&quot;created_at&quot;:&quot;2021-11-23T11:30:17.350Z&quot;,&quot;details&quot;:null,&quot;best_answer_id&quot;:2662,&quot;related_stacks_count&quot;:5},&quot;id&quot;:2662,&quot;state&quot;:&quot;active&quot;,&quot;body&quot;:&quot;Конструкция `contains` в `HashSet` используется для проверки наличия элемента в данном наборе.\r\n\r\nВот пример использования метода `contains`:\r\n\r\n```java\r\nHashSet&lt;String&gt; elements = new HashSet&lt;&gt;();\r\nelements.add(\&quot;foo\&quot;);\r\nelements.add(\&quot;bar\&quot;);\r\nelements.add(\&quot;baz\&quot;);\r\n\r\nif (elements.contains(\&quot;foo\&quot;)) {\r\n    System.out.println(\&quot;hashSet contains foo\&quot;);\r\n}\r\n```\r\nЗдесь мы создаем новый объект `HashSet` и добавляем в него несколько строковых элементов. Затем мы проверяем, содержит ли набор строку _\&quot;foo\&quot;_ с помощью метода `contains`. Если элемент присутствует, выводится сообщение _\&quot;hashSet contains foo\&quot;_. 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Затем мы проверяем, содержит ли набор строку _&quot;foo&quot;_ с помощью метода `contains`. Если элемент присутствует, выводится сообщение _&quot;hashSet contains foo&quot;_. Если элемент отсутствует, ничего не происходит.","datePublished":"2023-04-13T16:36:07.710Z","upvoteCount":0,"author":{"@type":"Person","name":"Иван Полежаев"},"url":"https://ru.hexlet.io/qna/java/questions/kak-rabotaet-metod-contains-v-hashset-java#answer-2662"}}}</script><div style="--container-size:var(--container-size-lg);margin-top:var(--mantine-spacing-xl);height:100%" class="m_7485cace mantine-Container-root" data-size="lg" data-strategy="block"><script type="application/ld+json">{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"position":1,"@type":"ListItem","item":{"@id":"/qna","name":"Вопросы и ответы"}},{"position":2,"@type":"ListItem","item":{"@id":"/qna/java/questions","name":"Java"}},{"position":3,"@type":"ListItem","item":{"@id":"/qna/java/questions/kak-rabotaet-metod-contains-v-hashset-java","name":"Как работает метод contains в hashset java\r"}}]}</script><div style="margin-bottom:var(--mantine-spacing-xs)" class="m_8b3717df mantine-Breadcrumbs-root"><a style="--text-fz:var(--mantine-font-size-sm);--text-lh:var(--mantine-line-height-sm);white-space:normal;color:inherit" class="mantine-focus-auto m_849cf0da m_f678d540 mantine-Breadcrumbs-breadcrumb m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-size="sm" data-underline="hover" href="/"><div style="color:inherit" class="m_4451eb3a mantine-Center-root"><svg xmlns="http://www.w3.org/2000/svg" width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-home-link "><path d="M20.085 11.085l-8.085 -8.085l-9 9h2v7a2 2 0 0 0 2 2h4.5"></path><path d="M9 21v-6a2 2 0 0 1 2 -2h2a2 2 0 0 1 1.807 1.143"></path><path d="M20 21a1 1 0 1 0 2 0a1 1 0 1 0 -2 0"></path><path d="M20 16a1 1 0 1 0 2 0a1 1 0 1 0 -2 0"></path><path d="M15 19a1 1 0 1 0 2 0a1 1 0 1 0 -2 0"></path><path d="M21 16l-5 3l5 2"></path></svg></div></a><div class="m_3b8f2208 mantine-Breadcrumbs-separator">/</div><a style="--text-fz:var(--mantine-font-size-sm);--text-lh:var(--mantine-line-height-sm);white-space:normal;color:inherit" class="mantine-focus-auto m_849cf0da m_f678d540 mantine-Breadcrumbs-breadcrumb m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-size="sm" data-underline="hover" href="/qna">Вопросы и ответы</a><div class="m_3b8f2208 mantine-Breadcrumbs-separator">/</div><a style="--text-fz:var(--mantine-font-size-sm);--text-lh:var(--mantine-line-height-sm);white-space:normal;color:inherit" class="mantine-focus-auto m_849cf0da m_f678d540 mantine-Breadcrumbs-breadcrumb m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-size="sm" data-underline="hover" href="/qna/java/questions">Java</a><div class="m_3b8f2208 mantine-Breadcrumbs-separator">/</div><p style="--text-fz:var(--mantine-font-size-sm);--text-lh:var(--mantine-line-height-sm);white-space:normal;color:var(--mantine-color-dimmed)" class="mantine-focus-auto m_f678d540 mantine-Breadcrumbs-breadcrumb m_b6d8b162 mantine-Text-root" data-size="sm">Как работает метод contains в hashset java
</p></div><style data-mantine-styles="inline">.__m__-_R_eub_{margin-bottom:var(--mantine-spacing-xs);}@media(min-width: 36em){.__m__-_R_eub_{margin-bottom:var(--mantine-spacing-xs);}}</style><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:space-between;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root __m__-_R_eub_"><style data-mantine-styles="inline">.__m__-_R_deub_{width:100%;}@media(min-width: 36em){.__m__-_R_deub_{width:70%;}}@media(min-width: 75em){.__m__-_R_deub_{width:75%;}}</style><div class="__m__-_R_deub_"><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><h1 style="--title-fw:var(--mantine-h1-font-weight);--title-lh:var(--mantine-h1-line-height);--title-fz:var(--mantine-h1-font-size)" class="m_8a5d1357 mantine-Title-root" data-order="1">Как работает метод contains в hashset java
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style="--title-fw:var(--mantine-h2-font-weight);--title-lh:var(--mantine-h2-line-height);--title-fz:var(--mantine-h2-font-size);margin-block:var(--mantine-spacing-xl)" class="m_8a5d1357 mantine-Title-root" data-order="2">Ответы</h2><div style="margin-bottom:var(--mantine-spacing-xl);padding:var(--mantine-spacing-lg)" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true" id="answer-2662"><div style="--group-gap:calc(1.125rem * var(--mantine-scale));--group-align:stretch;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><div style="--stack-gap:var(--mantine-spacing-md);--stack-align:stretch;--stack-justify:flex-start;font-size:var(--mantine-font-size-h1);font-weight:lighter;text-align:center" class="m_6d731127 mantine-Stack-root">0<a style="color:inherit" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/qna/java/questions/kak-rabotaet-metod-contains-v-hashset-java/answers/2662/vote"><div style="--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-thumb-up "><path d="M7 11v8a1 1 0 0 1 -1 1h-2a1 1 0 0 1 -1 -1v-7a1 1 0 0 1 1 -1h3a4 4 0 0 0 4 -4v-1a2 2 0 0 1 4 0v5h3a2 2 0 0 1 2 2l-1 5a2 3 0 0 1 -2 2h-7a3 3 0 0 1 -3 -3"></path></svg></div></a><div style="--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-check "><path d="M5 12l5 5l10 -10"></path></svg></div></div><div style="--stack-gap:var(--mantine-spacing-md);--stack-align:stretch;--stack-justify:flex-start;width:100%;min-width:0rem" class="m_6d731127 mantine-Stack-root"><div style="margin-bottom:auto" class="m_d08caa0 mantine-Typography-root"><p>Конструкция <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">contains</code> в <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">HashSet</code> используется для проверки наличия элемента в данном наборе.</p>
<p>Вот пример использования метода <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">contains</code>:</p>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">HashSet&lt;String&gt; elements = new HashSet&lt;&gt;();
elements.add(&quot;foo&quot;);
elements.add(&quot;bar&quot;);
elements.add(&quot;baz&quot;);

if (elements.contains(&quot;foo&quot;)) {
    System.out.println(&quot;hashSet contains foo&quot;);
}</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<p>Здесь мы создаем новый объект <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">HashSet</code> и добавляем в него несколько строковых элементов. Затем мы проверяем, содержит ли набор строку <em>&quot;foo&quot;</em> с помощью метода <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">contains</code>. Если элемент присутствует, выводится сообщение <em>&quot;hashSet contains foo&quot;</em>. Если элемент отсутствует, ничего не происходит.</p></div><div class="m_3eebeb36 mantine-Divider-root" data-orientation="horizontal" role="separator"></div><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:flex-start;--group-wrap:wrap;font-size:var(--mantine-font-size-sm)" class="m_4081bf90 mantine-Group-root"><div style="--group-gap:var(--mantine-spacing-xs);--group-align:center;--group-justify:flex-start;--group-wrap:wrap;margin-inline-start:auto" class="m_4081bf90 mantine-Group-root"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-calendar "><path d="M4 7a2 2 0 0 1 2 -2h12a2 2 0 0 1 2 2v12a2 2 0 0 1 -2 2h-12a2 2 0 0 1 -2 -2v-12"></path><path d="M16 3v4"></path><path d="M8 3v4"></path><path d="M4 11h16"></path><path d="M11 15h1"></path><path d="M12 15v3"></path></svg><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root" data-inherit="true">3 года назад</p></div><div style="--group-gap:var(--mantine-spacing-xs);--group-align:center;--group-justify:flex-start;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-user "><path d="M8 7a4 4 0 1 0 8 0a4 4 0 0 0 -8 0"></path><path d="M6 21v-2a4 4 0 0 1 4 -4h4a4 4 0 0 1 4 4v2"></path></svg><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root" data-inherit="true">Иван Полежаев</p></div></div></div></div></div><style data-mantine-styles="inline">.__m__-_R_4bbdiub_{--carousel-slide-gap:var(--mantine-spacing-xs);--carousel-slide-size:70%;}@media(min-width: 36em){.__m__-_R_4bbdiub_{--carousel-slide-gap:var(--mantine-spacing-xl);--carousel-slide-size:50%;}}</style><div 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