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Не вычисляйте ничего самостоятельно, ваша программа должна производить все вычисления сама.\n\nОбратите внимание, что интерпретатор производит арифметические вычисления в правильном порядке: сначала деление и умножение, потом сложение и вычитание\n\nТакже обратите внимание на то, что в java по умолчанию используется целочисленное деление, `3 / 2` будет `1`.\n","prepared_readme":"## src/main/java/io/hexlet/App.java\n\nРеализуйте программу, которая вычисляет значение выражения `8 / 2 + 5 - -3 / 2` и выводит результат на экран. Не вычисляйте ничего самостоятельно, ваша программа должна производить все вычисления сама.\n\nОбратите внимание, что интерпретатор производит арифметические вычисления в правильном порядке: сначала деление и умножение, потом сложение и вычитание\n\nТакже обратите внимание на то, что в java по умолчанию используется целочисленное деление, `3 / 2` будет `1`.\n","has_solution":true,"entity_name":"Композиция операций"},"units":[{"id":13668,"name":"theory","url":"/courses/java-basics/lessons/composition/theory_unit"},{"id":13669,"name":"quiz","url":"/courses/java-basics/lessons/composition/quiz_unit"},{"id":13758,"name":"exercise","url":"/courses/java-basics/lessons/composition/exercise_unit"}],"links":[],"ordered_units":[{"id":13668,"name":"theory","url":"/courses/java-basics/lessons/composition/theory_unit"},{"id":13669,"name":"quiz","url":"/courses/java-basics/lessons/composition/quiz_unit"},{"id":13758,"name":"exercise","url":"/courses/java-basics/lessons/composition/exercise_unit"}],"id":5786,"slug":"composition","state":"approved","name":"Композиция операций","course_order":153,"goal":"Учимся вычисялть значения составных выражений","self_study":null,"theory_video_provider":null,"theory_video_uid":null,"theory":"А что, если понадобится вычислить такое выражение: *3 + 5 - 2*? Именно так мы и запишем:\n\n```java\nSystem.out.println(3 + 5 - 2); // 3 + 5 - 2 => 8 - 2 => 6\n```\n\nОбратите внимание, что компьютер производит арифметические вычисления в правильном порядке: сначала деление и умножение, потом сложение и вычитание. Иногда этот порядок нужно изменить — об этом немного далее.\n\nИли другой пример:\n\n```java\nSystem.out.println(2 * 4 * 5 * 10); // 2 * 4 * 5 * 10 => 8 * 5 * 10 => 40 * 10 => 400\n```\n\nКак видно, операции можно соединять друг с другом и таким образом вычислять все более сложные составные выражения. Чтобы представить себе то, как происходят вычисления внутри интерпретатора, давайте разберем пример:\n\n```java\n2 * 4 * 5 * 10\n```\n\nВ этом примере:\n\n1. Сначала вычисляем *2 * 4* и получаем выражение *8 * 5 * 10*\n2. Затем умножаем *8 * 5*. В итоге имеем *40 * 10*\n3. В конце концов происходит последнее умножение, и получается результат *400*\n"},"lessonMember":null,"courseMember":null,"course":{"start_lesson":{"exercise":null,"units":[{"id":4991,"name":"theory","url":"/courses/java-basics/lessons/intro/theory_unit"}],"links":[],"ordered_units":[{"id":4991,"name":"theory","url":"/courses/java-basics/lessons/intro/theory_unit"}],"id":2255,"slug":"intro","state":"approved","name":"Введение","course_order":100,"goal":"Знакомимся с курсом","self_study":null,"theory_video_provider":null,"theory_video_uid":null,"theory":"Java — язык программирования общего назначения, который является одним из самых востребованных языков. Он используется для создания приложений в разных областях: в вебе, разработке игр, мобильного ПО, и даже программ для корпораций и научных институтов.\n\nПодавляющее большинство крупных компаний так или иначе используют Java. Очень много серверных приложений для корпораций написаны на этом языке. Например, речь идет о программах для финансовых организаций, которые обеспечивают проведение транзакций, фиксацию торговых операций.\n\nНа Java написано много веб-приложений. Популярные фреймворки, в том числе Spring, Struts, JSP, используются для создания разных приложений в вебе: от ecommerce-проектов до крупных порталов, от образовательных платформ до правительственных ресурсов. Потому работу на Java можно найти практически везде. Профессия Java-разработчик на Хекслете дает все необходимые знания и навыки для трудоустройства, и именно с этого курса начинается погружение в сам язык.\n\nКурс включает в себя основы программирования на Java и объясняет важные базовые вещи: типы данных и их представление, стандарты именования, кодирование строк, работа над ошибками, побочные эффекты и многое другое.\n\nИзучение основ программирования с самого нуля требует особого способа организации учебного материала. На первом этапе необходимо первичное привыкание к языковым конструкциям и закрепление их на практике.\n\nЦели данного курса:\n\n* Познакомиться с основными конструкциями языка\n* Научиться работать в среде Хекслета, разобраться со структурой практических заданий\n* Познакомиться с отладкой и научиться эффективно ее выполнять\n\nКаждый урок курса заканчивается вопросами для самоконтроля и упражнением, а после курса вас ждет множество дополнительных заданий, которые желательно выполнить до перехода на следующий курс. Эти задания охватывают сразу весь материал курса и помогают наработать необходимую практику для дальнейшего продвижения по профессии.\n"},"id":251,"slug":"java-basics","challenges_count":7,"name":"Основы Java","allow_indexing":true,"state":"approved","course_state":"finished","pricing_type":"free","description":"На этом курсе вы изучите основы языка Java. Вы познакомитесь с типами данных в Java, а также узнаете больше о методах, условиях, циклах и других основных конструкциях этого языка программирования. В итоге вы научитесь писать несложные программы, использовать и определять методы, искать и анализировать ошибки в коде.\n\nОбучение включает в себя основы программирования на Java и объясняет важные базовые вещи: типы данных и их представление в языке, стандарты именования и кодирование строк. После курса вы начнете понимать, как происходит работа над ошибками и как возникают побочные эффекты.\n\nОсвоить программирование на Java c нуля непросто, поэтому во время обучения вы будете закреплять теорию на практике. Уже с первых уроков вы начнете выполнять упражнения, которые помогут быстрее привыкнуть к особенностям языка. Знания из этого курса помогут получить основное представление о языке Java, его принципах и особенностях.","kind":"basic","updated_at":"2026-02-24T17:41:26.946Z","language":"java","duration_cache":296340,"skills":["Создавать несложные программы, используя основные конструкции языка (условия, циклы, методы и другие)","Разделять код на методы для повторного использования","Правильно анализировать ошибки в коде и пользоваться отладочной печатью при их 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__m__-_R_rdub_"><style data-mantine-styles="inline">.__m__-_R_6qrdub_{margin-top:0rem;padding-inline:var(--mantine-spacing-xs);width:100%;}@media(min-width: 48em){.__m__-_R_6qrdub_{margin-top:var(--mantine-spacing-xl);width:80%;}}@media(min-width: 62em){.__m__-_R_6qrdub_{padding-inline:var(--mantine-spacing-xl);}}</style><div style="margin-inline:auto;max-width:var(--mantine-breakpoint-xl)" class="__m__-_R_6qrdub_"><div style="color:var(--mantine-color-dimmed)" class="m_4451eb3a mantine-Center-root" data-inline="true"><div style="--ti-size:var(--ti-size-xs);--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;margin-inline-end:calc(0.125rem * var(--mantine-scale));color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent" data-size="xs"><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-lock "><path d="M5 13a2 2 0 0 1 2 -2h10a2 2 0 0 1 2 2v6a2 2 0 0 1 -2 2h-10a2 2 0 0 1 -2 -2v-6"></path><path d="M11 16a1 1 0 1 0 2 0a1 1 0 0 0 -2 0"></path><path d="M8 11v-4a4 4 0 1 1 8 0v4"></path></svg></div><p style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Основы Java</p></div><h1 style="--title-fw:var(--mantine-h1-font-weight);--title-lh:var(--mantine-h1-line-height);--title-fz:var(--mantine-h1-font-size);margin-bottom:var(--mantine-spacing-xl)" class="m_8a5d1357 mantine-Title-root" data-order="1">Теория: Композиция операций</h1><script type="application/ld+json">{"@context":"https://schema.org","@type":"LearningResource","name":"Композиция операций","inLanguage":"ru","isPartOf":{"@type":"LearningResource","name":"Основы Java"},"isAccessibleForFree":"False","hasPart":{"@type":"WebPageElement","isAccessibleForFree":"False","cssSelector":".paywalled"}}</script><div class=""><div style="--alert-color:var(--mantine-color-indigo-light-color);margin-bottom:var(--mantine-spacing-lg);font-size:var(--mantine-font-size-lg)" class="m_66836ed3 mantine-Alert-root" id="mantine-_R_remqrdub_" role="alert" aria-describedby="mantine-_R_remqrdub_-body" aria-labelledby="mantine-_R_remqrdub_-title"><div class="m_a5d60502 mantine-Alert-wrapper"><div class="m_667f2a6a mantine-Alert-icon"><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-rocket "><path d="M4 13a8 8 0 0 1 7 7a6 6 0 0 0 3 -5a9 9 0 0 0 6 -8a3 3 0 0 0 -3 -3a9 9 0 0 0 -8 6a6 6 0 0 0 -5 3"></path><path d="M7 14a6 6 0 0 0 -3 6a6 6 0 0 0 6 -3"></path><path d="M14 9a1 1 0 1 0 2 0a1 1 0 1 0 -2 0"></path></svg></div><div class="m_667c2793 mantine-Alert-body"><div class="m_6a03f287 mantine-Alert-title"><span id="mantine-_R_remqrdub_-title" class="m_698f4f23 mantine-Alert-label">Полный доступ к материалам</span></div><div id="mantine-_R_remqrdub_-body" class="m_7fa78076 mantine-Alert-message"><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:space-between;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Зарегистрируйтесь и получите доступ к этому и десяткам других курсов</p><a style="--button-height:var(--button-height-xs);--button-padding-x:var(--button-padding-x-xs);--button-fz:var(--mantine-font-size-xs);--button-bg:linear-gradient(45deg, var(--mantine-color-blue-filled) 0%, var(--mantine-color-cyan-filled) 100%);--button-hover:linear-gradient(45deg, var(--mantine-color-blue-filled) 0%, var(--mantine-color-cyan-filled) 100%);--button-color:var(--mantine-color-white);--button-bd:none" class="mantine-focus-auto mantine-active m_77c9d27d mantine-Button-root m_87cf2631 mantine-UnstyledButton-root" data-variant="gradient" data-size="xs" href="/u/new"><span class="m_80f1301b mantine-Button-inner"><span class="m_811560b9 mantine-Button-label">Зарегистрироваться</span></span></a></div></div></div></div></div><div class="paywalled m_d08caa0 mantine-Typography-root"><p>А что, если понадобится вычислить такое выражение: <em>3 + 5 - 2</em>? Именно так мы и запишем:</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">System.out.println(3 + 5 - 2); // 3 + 5 - 2 => 8 - 2 => 6</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>Обратите внимание, что компьютер производит арифметические вычисления в правильном порядке: сначала деление и умножение, потом сложение и вычитание. Иногда этот порядок нужно изменить — об этом немного далее.</p>
<p>Или другой пример:</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">System.out.println(2 * 4 * 5 * 10); // 2 * 4 * 5 * 10 => 8 * 5 * 10 => 40 * 10 => 400</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>Как видно, операции можно соединять друг с другом и таким образом вычислять все более сложные составные выражения. Чтобы представить себе то, как происходят вычисления внутри интерпретатора, давайте разберем пример:</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">2 * 4 * 5 * 10</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>В этом примере:</p>
<ol>
<li>Сначала вычисляем <em>2 * 4</em> и получаем выражение <em>8 * 5 * 10</em></li>
<li>Затем умножаем <em>8 * 5</em>. В итоге имеем <em>40 * 10</em></li>
<li>В конце концов происходит последнее умножение, и получается результат <em>400</em></li>
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