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Java 13英文文档，全称为`jdk-13.0.1_doc-all.zip`，是Oracle公司发布的针对Java Development Kit (JDK) 13的官方技术文档，旨在为开发者提供详尽的API（应用程序编程接口）参考。这份文档包含了自Java 12以来的所有API函数、类和接口方法，帮助开发者理解和使用Java 13的新特性和功能。 Java API（应用程序编程接口）是Java编程语言的核心组成部分，它定义了如何与Java运行环境交互的一系列预定义的类和接口。这些API覆盖了各种编程任务，如输入/输出、网络通信、数据处理、图形用户界面构建等。Java API文档是开发者日常工作中不可或缺的工具，它提供了每个类、接口和方法的详细说明、参数列表、返回值、异常以及使用示例。在Java 13中，以下几个显著的新特性值得关注： 1. **Switch Expressions增强**：Java 13对switch语句进行了扩展，引入了switch表达式，使其更符合函数式编程风格。这使得switch结构可以用于变量赋值和流控制，同时支持了yield关键字，以返回结果。 2. **Text Blocks**：为了方便处理多行字符串，Java 13引入了文本块（Text Blocks），这是一种新的字符串字面量形式，可以减少字符串拼接和转义字符的使用，提高代码可读性。 3. **JEP 350: Transparent G1 Garbage Collector**：G1垃圾收集器进行了优化，目标是使其成为默认的垃圾收集器，并减少垃圾回收对应用性能的影响。透明的G1意味着开发者无需进行特定的调优，就能获得较好的性能。 4. **JEP 355: JDK-specific ZIP File Format Extensions**：更新了ZIP文件格式的处理，使得JDK可以识别并利用特定于JDK的扩展，比如用于模块系统的模块信息。 5. **JEP 358: macOS Catalina (19H114) Support**：对macOS Catalina操作系统的支持，确保Java 13能在最新的苹果系统上稳定运行。 6. **JEP 356: Experimental AOT and JIT Compiler**：引入了一个实验性的AOT（ahead-of-time）和JIT（just-in-time）编译器，旨在提高启动时间和内存占用。 7. **JEP 354: HTTP Client (Standard)**：HTTP客户端API被提升为标准API，提供了一种更现代、更高效的方式来处理HTTP请求。通过阅读`docs`这个压缩包中的文档，开发者可以深入理解这些新特性，学习如何在实际项目中应用它们。同时，文档还涵盖了已有的类库和框架，例如集合框架、I/O、网络、并发编程等，这些都是Java开发的基础。对于初学者，了解和熟练使用Java API是成为一名合格Java开发者的必要步骤。对于经验丰富的开发者，定期查阅更新的API文档可以帮助他们保持技术的前沿性，充分利用Java的新特性提高开发效率。因此，无论你是新手还是资深开发者，这份Java 13英文文档都是你编程旅程中不可或缺的参考资料。

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java13英文文档 jdk-13.0.1_doc-all.zip （10483个子文件）

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<!DOCTYPE HTML>  <html lang="en"> <head>  <title>Uses of Class java.lang.String (Java SE 13 & JDK 13 )</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta name="description" content="use: module: java.base, package: java.lang, class: String"> <meta name="generator" content="javadoc/ClassUseWriter"> <link rel="stylesheet" type="text/css" href="../../../../stylesheet.css" title="Style"> <link rel="stylesheet" type="text/css" href="../../../../script-dir/jquery-ui.css" title="Style"> <script type="text/javascript" src="../../../../script.js"></script> <script type="text/javascript" src="../../../../script-dir/jszip/dist/jszip.min.js"></script> <script type="text/javascript" src="../../../../script-dir/jszip-utils/dist/jszip-utils.min.js"></script>  <script type="text/javascript" src="../../../../script-dir/jquery-3.4.1.js"></script> <script type="text/javascript" src="../../../../script-dir/jquery-ui.js"></script> </head> <body class="class-use"> <script type="text/javascript">var pathtoroot = "../../../../"; loadScripts(document, 'script');</script> <noscript> <div>JavaScript is disabled on your browser.</div> </noscript> <header role="banner"> <nav role="navigation"> <div class="fixedNav">  <div class="topNav"><a id="navbar.top">  </a> <div class="skipNav"><a href="#skip.navbar.top" title="Skip navigation links">Skip navigation links</a></div> <a id="navbar.top.firstrow">  </a> <ul class="navList" title="Navigation"> <li><a href="../../../../index.html">Overview</a></li> <li><a href="../../../module-summary.html">Module</a></li> <li><a href="../package-summary.html">Package</a></li> <li><a href="../String.html" title="class in java.lang">Class</a></li> <li class="navBarCell1Rev">Use</li> <li><a href="../package-tree.html">Tree</a></li> <li><a href="../../../../deprecated-list.html">Deprecated</a></li> <li><a href="../../../../index-files/index-1.html">Index</a></li> <li><a href="../../../../help-doc.html">Help</a></li> </ul> <div class="aboutLanguage"><div style="margin-top: 14px;"><strong>Java SE 13 & JDK 13</strong> </div></div> </div> <div class="subNav"> <div class="navListSearch"><label for="search">SEARCH:</label> <input type="text" id="search" value="search" disabled="disabled"> <input type="reset" id="reset" value="reset" disabled="disabled"> </div> </div> <a id="skip.navbar.top">  </a>  </div> <div class="navPadding"> </div> <script type="text/javascript"> </script> </nav> </header> <main role="main"> <div class="header"> <h1 title="Uses of Class java.lang.String" class="title">Uses of Class<br>java.lang.String</h1> </div> <div class="classUseContainer"> <div class="useSummary"> <table> <caption><span>Packages that use <a href="../String.html" title="class in java.lang">String</a></span><span class="tabEnd"> </span></caption> <thead> <tr> <th class="colFirst" scope="col">Package</th> <th class="colLast" scope="col">Description</th> </tr> </thead> <tbody> <tr class="altColor"> <th class="colFirst" scope="row"><a href="#com.sun.jarsigner">com.sun.jarsigner</a></th> <td class="colLast"> <div class="block">This package comprises the interfaces and classes used to define the signing mechanism used by the <code>jarsigner</code> tool.</div> </td> </tr> <tr class="rowColor"> <th class="colFirst" scope="row"><a href="#com.sun.java.accessibility.util">com.sun.java.accessibility.util</a></th> <td class="colLast"> <div class="block">Provides a collection of interfaces and classes that compose the Java Accessibility Utilities.</div> </td> </tr> <tr class="altColor"> <th class="colFirst" scope="row"><a href="#com.sun.jdi">com.sun.jdi</a></th> <td class="colLast"> <div class="block">This is the core package of the Java Debug Interface (JDI), it defines mirrors for values, types, and the target VirtualMachine itself - as well bootstrapping facilities.</div> </td> </tr> <tr class="rowColor"> <th class="colFirst" scope="row"><a href="#com.sun.jdi.connect">com.sun.jdi.connect</a></th> <td class="colLast"> <div class="block">This package defines connections between the virtual machine using the JDI and the target virtual machine.</div> </td> </tr> <tr class="altColor"> <th class="colFirst" scope="row"><a href="#com.sun.jdi.connect.spi">com.sun.jdi.connect.spi</a></th> <td class="colLast"> <div class="block">This package comprises the interfaces and classes used to develop new <a href="../../../../jdk.jdi/com/sun/jdi/connect/spi/TransportService.html" title="class in com.sun.jdi.connect.spi"><code>TransportService</code></a> implementations.</div> </td> </tr> <tr class="rowColor"> <th class="colFirst" scope="row"><a href="#com.sun.jdi.event">com.sun.jdi.event</a></th> <td class="colLast"> <div class="block">This package defines JDI events and event processing.</div> </td> </tr> <tr class="altColor"> <th class="colFirst" scope="row"><a href="#com.sun.jdi.request">com.sun.jdi.request</a></th> <td class="colLast"> <div class="block">This package is used to request that a JDI event be sent under specified conditions.</div> </td> </tr> <tr class="rowColor"> <th class="colFirst" scope="row"><a href="#com.sun.management">com.sun.management</a></th> <td class="colLast"> <div class="block">This package contains the JDK's extension to the standard implementation of the <a href="../../../../java.management/java/lang/management/package-summary.html"><code>java.lang.management</code></a> API and also defines the management interface for some other components of the platform.</div> </td> </tr> <tr class="altColor"> <th class="colFirst" scope="row"><a href="#com.sun.net.httpserver">com.sun.net.httpserver</a></th> <td class="colLast"> <div class="block">Provides a simple high-level Http server API, which can be used to build embedded HTTP servers.</div> </td> </tr> <tr class="rowColor"> <th class="colFirst" scope="row"><a href="#com.sun.nio.sctp">com.sun.nio.sctp</a></th> <td class="colLast"> <div class="block">A Java API for Stream Control Transport Protocol.</div> </td> </tr> <tr class="altColor"> <th class="colFirst" scope="row"><a href="#com.sun.security.auth">com.sun.security.auth</a></th> <td class="colLast"> <div class="block">Provides implementations of <a href="../../security/Principal.html" title="interface in java.security"><code>Principal</code></a>.</div> </td> </tr> <tr class="rowColor"> <th class="colFirst" scope="row"><a href="#com.sun.security.auth.login">com.sun.security.auth.login</a></th> <td class="colLast"> <div class="block">Provides an implementation of <a href="../../../javax/security/auth/login/Configuration.html" title="class in javax.security.auth.login"><code>Configuration</code></a>.</div> </td> </tr> <tr class="altColor"> <th class="colFirst" scope="row"><a href="#com.sun.security.auth.module">com.sun.security.auth.module</a></th> <td class="colLast"> <div class="block">Provides implementations of <a href="../../../javax/security/auth/spi/LoginModule.html" title="interface in javax.security.auth.spi"><code>LoginModule</code></a>.</div> </td> </tr> <tr class="rowColor"> <th class="colFirst" scope="row"><a href="#com.sun.security.jgss">com.sun.security.jgss</a></th> <td class="colLast"> <div class="block">This package defines classes and interfaces for the JDK extensions to the GSS-API.</div> </td> </tr> <tr class="altColor"> <th class="colFirst" scope="row"><a href="#com.sun.source.doctree">com.sun.source.doctree</a></th> <td class="colLast"> <div class="block">Provides interfaces to represent documentation comments as abstract syntax trees (AST).</div> </td> </tr> <tr class="rowColor"> <th class="colFirst" scope="

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