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java-collections-ru/maps/README.html
62 строки
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@hexlet/cli
submit java-collections-ru/maps
27 ноя 2023, 16:38
27 ноя 2023, 16:38
e0f4581
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </head> <body> <style>@charset "UTF-8";@import "https://fonts.bunny.net/css?family=Lato:400,900|Roboto+Mono:400,700&display=swap";div.marpit>svg>foreignObject>section{width:1280px;height:720px;box-sizing:border-box;overflow:hidden;position:relative;scroll-snap-align:center center}div.marpit>svg>foreignObject>section:after{bottom:0;content:attr(data-marpit-pagination);padding:inherit;pointer-events:none;position:absolute;right:0}div.marpit>svg>foreignObject>section:not([data-marpit-pagination]):after{display:none}/* Normalization */div.marpit>svg>foreignObject>section :is(h1,marp-h1){font-size:2em;margin:0.67em 0}div.marpit>svg>foreignObject>section video::-webkit-media-controls{will-change:transform}@page{size:1280px 5000px;margin:0}@media print{body,html{background-color:#fff;margin:0;page-break-inside:avoid;break-inside:avoid-page}div.marpit>svg>foreignObject>section{page-break-before:always;break-before:page}div.marpit>svg>foreignObject>section,div.marpit>svg>foreignObject>section *{-webkit-print-color-adjust:exact!important;animation-delay:0s!important;animation-duration:0s!important;color-adjust:exact!important;transition:none!important}div.marpit>svg[data-marpit-svg]{display:block;height:100vh;width:100vw}} /*! * Marp / Marpit Gaia theme. * * @theme gaia * @author Yuki Hattori * * @auto-scaling true * @size 16:9 1280px 720px * @size 4:3 960px 720px */div.marpit>svg>foreignObject>section :is(pre,marp-pre) code.hljs{display:block;overflow-x:auto;padding:1em}div.marpit>svg>foreignObject>section code.hljs{padding:3px 5px}div.marpit>svg>foreignObjec … [Строка слишком длинная. Вы можете скачать файл] /* @theme my-first-theme */div.marpit>svg>foreignObject>section{width:1280px;height:5000px}div.marpit>svg>foreignObject>section[data-marpit-advanced-background=background]{columns:initial!important;display:block!important;padding:0!important}div.marpit>svg>foreignObject>section[data-marpit-advanced-background=background]:after,div.marpit>svg>foreignObject>section[data-marpit-advanced-background=background]:before,div.marpit>svg>foreignObject>section[data-marpit-advanced-background=content]:after,div.marpit>svg>foreignObject>section[data-marpit-advanced-background=content]:before{display:none!important}div.marpit>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]{all:initial;display:flex;flex-direction:row;height:100%;overflow:hidden;width:100%}div.marpit>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container][data-marpit-advanced-background-direction=vertical]{flex-direction:column}div.marpit>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split]>div[data-marpit-advanced-background-container]{width:var(--marpit-advanced-background-split,50%)}div.marpit>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split=right]>div[data-marpit-advanced-background-container]{margin-left:calc(100% - var(--marpit-advanced-background-split, 50%))}div.marpit>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]>figure{all:initial;background-position:center;background-repeat:no-repeat;background-size:cover;flex:auto;margin:0}div.marpit>svg>foreignObject>section[data-marpit-advanced-background=content],div.marpit>svg>foreignObject>section[data-marpit-advanced-background=pseudo]{background:transparent!important}div.marpit>svg>foreignObject>section[data-marpit-advanced-background=pseudo],div.marpit>svg[data-marpit-svg]>foreignObject[data-marpit-advanced-background=pseudo]{pointer-events:none!important}div.marpit>svg>foreignObject>section[data-marpit-advanced-background-split]{width:100%;height:100%}</style> <div class="marpit"><svg data-marpit-svg="" viewBox="0 0 1280 5000"><foreignObject width="1280" height="5000"><section id="1" data-marpit-fragments="4"> <h1>Словари</h1> <h2>Ссылки</h2> <ul> <li data-marpit-fragment="1"><a href="https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html">Класс HashMap</a></li> </ul> <h2>main/java/exercise/App.java</h2> <h2>Задачи</h2> <ul> <li data-marpit-fragment="2">Создайте класс <code>App</code> с публичным статическим методом <code>getWordCount()</code>, который принимает в качестве аргумента предложение. Метод возвращает словарь <code>Map</code>, в котором ключи — это слова исходного предложения, а значения — количество соответствующих слов в предложении. Слова в предложении разделены пробелами.</li> </ul> <pre><code class="language-java"><span class="hljs-type">String</span> <span class="hljs-variable">sentence</span> <span class="hljs-operator">=</span> <span class="hljs-string">"java is the best programming language java"</span>; <span class="hljs-type">Map</span> <span class="hljs-variable">wordsCount</span> <span class="hljs-operator">=</span> App.getWordCount(sentence); System.out.println(wordsCount); <span class="hljs-comment">// => {the=1, java=2, is=1, best=1, language=1, programming=1}</span> </code></pre> <ul> <li data-marpit-fragment="3">В классе <code>App</code> создайте публичный статический метод <code>toString()</code>, который принимает в качестве аргумента словарь <code>Map</code> с количеством слов в предложении. Метод должен возвращать строковое представление словаря. Обратите внимание на форматирование вывода. Результат должен быть заключен в фигурные скобки, каждое слово выводится с новой строки с отступом в 2 пробела.</li> </ul> <pre><code class="language-java"><span class="hljs-type">String</span> <span class="hljs-variable">sentence</span> <span class="hljs-operator">=</span> <span class="hljs-string">"the java is the best programming language java"</span>; <span class="hljs-type">Map</span> <span class="hljs-variable">wordsCount</span> <span class="hljs-operator">=</span> App.getWordCount(sentence); <span class="hljs-type">String</span> <span class="hljs-variable">result</span> <span class="hljs-operator">=</span> App.toString(wordsCount); System.out.println(result); <span class="hljs-comment">// =></span> <span class="hljs-comment">// {</span> <span class="hljs-comment">// the: 2</span> <span class="hljs-comment">// java: 2</span> <span class="hljs-comment">// is: 1</span> <span class="hljs-comment">// best: 1</span> <span class="hljs-comment">// language: 1</span> <span class="hljs-comment">// programming: 1</span> <span class="hljs-comment">// }</span> <span class="hljs-type">Map</span> <span class="hljs-variable">wordsCount2</span> <span class="hljs-operator">=</span> App.getWordCount(<span class="hljs-string">""</span>); <span class="hljs-type">String</span> <span class="hljs-variable">result2</span> <span class="hljs-operator">=</span> App.toString(wordsCount2); System.out.println(result2); <span class="hljs-comment">// => {}</span> </code></pre> <h2>Подсказки</h2> <ul> <li data-marpit-fragment="4">Можно получить все ключи словаря при помощи метода <code>keySet()</code> класса <code>HashMap</code> и обойти их в цикле.</li> </ul> </section> <script>!function(){"use strict";const t={h1:{proto:()=>HTMLHeadingElement,attrs:{role:"heading","aria-level":"1"},style:"display: block; font-size: 2em; margin-block-start: 0.67em; margin-block-end: 0.67em; margin-inline-start: 0px; margin-inline-end: 0px; font-weight: 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