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Как из стринг сделать инт java — Q&A Хекслет
2026-02-26 18:17 Diff
https://ru.hexlet.io/qna/java/questions/kak-iz-string-sdelat-int-java
Ответы

Чтобы преобразовать строку в число, нужно использовать статический метод parseInt() из класса Integer. Этот метод преобразует строку в десятичное число:
var num = "123"; Integer.parseInt(num); // 123
Строка обязательно должна содержать только цифры, за исключением первого символа. Первый символ может быть минусом, в этом случае будет получено отрицательное число:
var num = "-123"; Integer.parseInt(num); // -123
Если строка не может быть преобразована в число, будет выброшено исключение NumberFormatException
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из стринг сделать инт java\r&quot;,&quot;created_at&quot;:&quot;2021-12-21T11:21:20.671Z&quot;,&quot;details&quot;:null,&quot;best_answer_id&quot;:742,&quot;related_stacks_count&quot;:5},&quot;answers&quot;:[{&quot;user&quot;:{&quot;id&quot;:198906,&quot;email&quot;:&quot;litvinovmksm@gmail.com&quot;,&quot;first_name&quot;:&quot;Maksim&quot;,&quot;last_name&quot;:&quot;Litvinov&quot;,&quot;telegram&quot;:&quot;&quot;,&quot;full_name&quot;:&quot;Maksim Litvinov&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;:1387,&quot;answers_count&quot;:1,&quot;slug&quot;:&quot;kak-iz-string-sdelat-int-java&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;Как из стринг сделать инт java\r&quot;,&quot;created_at&quot;:&quot;2021-12-21T11:21:20.671Z&quot;,&quot;details&quot;:null,&quot;best_answer_id&quot;:742,&quot;related_stacks_count&quot;:5},&quot;id&quot;:742,&quot;state&quot;:&quot;active&quot;,&quot;body&quot;:&quot;Чтобы преобразовать строку в число, нужно использовать статический метод `parseInt()` из класса `Integer`. Этот метод преобразует строку в десятичное число:\r\n\r\n```\r\nvar num = \&quot;123\&quot;;\r\n\r\nInteger.parseInt(num); // 123\r\n```\r\n\r\nСтрока обязательно должна содержать только цифры, за исключением первого символа. Первый символ может быть минусом, в этом случае будет получено отрицательное число:\r\n\r\n```\r\nvar num = \&quot;-123\&quot;;\r\n\r\nInteger.parseInt(num); // -123\r\n```\r\n\r\nЕсли строка не может быть преобразована в число, будет выброшено исключение 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Этот метод преобразует строку в десятичное число:\r\n\r\n```\r\nvar num = &quot;123&quot;;\r\n\r\nInteger.parseInt(num); // 123\r\n```\r\n\r\nСтрока обязательно должна содержать только цифры, за исключением первого символа. Первый символ может быть минусом, в этом случае будет получено отрицательное число:\r\n\r\n```\r\nvar num = &quot;-123&quot;;\r\n\r\nInteger.parseInt(num); // -123\r\n```\r\n\r\nЕсли строка не может быть преобразована в число, будет выброшено исключение `NumberFormatException`","datePublished":"2022-09-01T09:28:50.432Z","upvoteCount":0,"author":{"@type":"Person","name":"Maksim Litvinov"},"url":"https://ru.hexlet.io/qna/java/questions/kak-iz-string-sdelat-int-java#answer-742"}}}</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-iz-string-sdelat-int-java","name":"Как из стринг сделать инт 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 из стринг сделать инт 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 из стринг сделать инт 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-742"><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-iz-string-sdelat-int-java/answers/742/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>Чтобы преобразовать строку в число, нужно использовать статический метод <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">parseInt()</code> из класса <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">Integer</code>. Этот метод преобразует строку в десятичное число:</p>
<code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">var num = &quot;123&quot;;

Integer.parseInt(num); // 123</code>
<p>Строка обязательно должна содержать только цифры, за исключением первого символа. Первый символ может быть минусом, в этом случае будет получено отрицательное число:</p>
<code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">var num = &quot;-123&quot;;

Integer.parseInt(num); // -123</code>
<p>Если строка не может быть преобразована в число, будет выброшено исключение <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">NumberFormatException</code></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">Maksim Litvinov</p></div></div></div></div></div><style 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