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Threads a > A and B enter the first if judgment at the same time. B > A enters the synchronized block first, and since instance is null, it executes instance=new Singleton ();Download the JDK installation package from Java's official website at http://www.oracle.com/technnetwork/java/javase/downloads/index.html, and select a suitable JDK version to download and install. The specific process is not detailed.Groups objects into a tree structure to represent a "part-to-whole" hierarchy. Composite allows users to use both individual and composite objects consistently.演绎两个高中男教师的爱情故事。 数学老师冰川彻（寺西优真 饰）从东京大学毕业之后，成为高中三年级的班主任，他的助教是体育老师赤城真澄（山本裕典 饰），虽然两人性格截然相反，但赤城却被冰川渐渐吸引。然而，冰川已经跟一名女子订下婚约…… 这部剧将于今年夏天在东京都会电视台、亚马逊Prime Video等平台上播出。The code can be modified:20,000 Yuan "Depth" Horgos "Face Changing": Zhang Xiaotian, a Game Reporter Behind Tax Depression; Editor, Yu Wei, Cui Yu该剧根据真实故事改编，讲述了一个普通家庭在不同历史时期，以非同寻常的奋斗牺牲、执着坚守、爱心奉献传承优良家风的动人故事 。