leetcode-problemset/leetcode-cn/originData/print-in-order.json

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            "questionId": "1203",
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            "categoryTitle": "Concurrency",
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            "title": "Print in Order",
            "titleSlug": "print-in-order",
            "content": "<p>Suppose we have a class:</p>\n\n<pre>\npublic class Foo {\n  public void first() { print(&quot;first&quot;); }\n  public void second() { print(&quot;second&quot;); }\n  public void third() { print(&quot;third&quot;); }\n}\n</pre>\n\n<p>The same instance of <code>Foo</code> will be passed to three different threads. Thread A will call <code>first()</code>, thread B will call <code>second()</code>, and thread C will call <code>third()</code>. Design a mechanism and modify the program to ensure that <code>second()</code> is executed after <code>first()</code>, and <code>third()</code> is executed after <code>second()</code>.</p>\n\n<p><strong>Note:</strong></p>\n\n<p>We do not know how the threads will be scheduled in the operating system, even though the numbers in the input seem to imply the ordering. The input format you see is mainly to ensure our tests&#39; comprehensiveness.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1,2,3]\n<strong>Output:</strong> &quot;firstsecondthird&quot;\n<strong>Explanation:</strong> There are three threads being fired asynchronously. The input [1,2,3] means thread A calls first(), thread B calls second(), and thread C calls third(). &quot;firstsecondthird&quot; is the correct output.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [1,3,2]\n<strong>Output:</strong> &quot;firstsecondthird&quot;\n<strong>Explanation:</strong> The input [1,3,2] means thread A calls first(), thread B calls third(), and thread C calls second(). &quot;firstsecondthird&quot; is the correct output.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>nums</code> is a permutation of <code>[1, 2, 3]</code>.</li>\n</ul>\n",
            "translatedTitle": "按序打印",
            "translatedContent": "<p>给你一个类：</p>\n\n<pre>\npublic class Foo {\n&nbsp; public void first() { print(\"first\"); }\n&nbsp; public void second() { print(\"second\"); }\n&nbsp; public void third() { print(\"third\"); }\n}</pre>\n\n<p>三个不同的线程 A、B、C 将会共用一个&nbsp;<code>Foo</code>&nbsp;实例。</p>\n\n<ul>\n\t<li>线程 A 将会调用 <code>first()</code> 方法</li>\n\t<li>线程 B 将会调用&nbsp;<code>second()</code> 方法</li>\n\t<li>线程 C 将会调用 <code>third()</code> 方法</li>\n</ul>\n\n<p>请设计修改程序，以确保 <code>second()</code> 方法在 <code>first()</code> 方法之后被执行，<code>third()</code> 方法在 <code>second()</code> 方法之后被执行。</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li>尽管输入中的数字似乎暗示了顺序，但是我们并不保证线程在操作系统中的调度顺序。</li>\n\t<li>你看到的输入格式主要是为了确保测试的全面性。</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [1,2,3]\n<strong>输出：</strong>\"firstsecondthird\"\n<strong>解释：</strong>\n有三个线程会被异步启动。输入 [1,2,3] 表示线程 A 将会调用 first() 方法，线程 B 将会调用 second() 方法，线程 C 将会调用 third() 方法。正确的输出是 \"firstsecondthird\"。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [1,3,2]\n<strong>输出：</strong>\"firstsecondthird\"\n<strong>解释：</strong>\n输入 [1,3,2] 表示线程 A 将会调用 first() 方法，线程 B 将会调用 third() 方法，线程 C 将会调用 second() 方法。正确的输出是 \"firstsecondthird\"。</pre>\n\n<p>&nbsp;</p>\n\n<ul>\n</ul>\n<strong>提示：</strong>\n\n<ul>\n\t<li><code>nums</code> 是 <code>[1, 2, 3]</code> 的一组排列</li>\n</ul>\n",
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