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Java API 19 和 JDK 19 是Java开发的关键组件，它们构成了Java开发环境的核心。JDK（Java Development Kit）是用于构建和运行Java应用程序的软件开发工具包，而Java API则是提供了一系列预定义的类库，使得开发者可以利用这些现成的组件进行编程。在Java API 19中，我们看到的是Java语言和平台的标准版（Java SE）的最新更新。这个版本通常包含了新的特性和改进，旨在提高性能、安全性和开发者体验。以下是一些可能包含在Java API 19中的关键知识点： 1. **新特性**：每个JDK版本都会引入新的功能。例如，JDK 19可能会增加对模块系统、类型推断、并发模型或者垃圾收集算法的改进。了解这些新特性将有助于开发者利用最新的编程技术。 2. **模块系统**：自JDK 9引入以来，Java模块系统（Project Jigsaw）已经逐步成熟。在JDK 19中，可能有进一步的优化，比如更好的封装和依赖管理，这有助于大型项目的组织和维护。 3. **类型推断**：Java的类型推断（如在Java 8中的`var`关键字）简化了代码编写。JDK 19可能会扩展这一特性，让代码更加简洁易读。 4. **并发编程**：Java提供了强大的并发工具，如`ExecutorService`和`ForkJoinPool`。新版本可能引入更高效的并发策略或改进现有工具，以适应多核处理器的性能需求。 5. **垃圾收集和内存管理**：JDK 19可能会优化垃圾收集器，如ZGC（Z Garbage Collector）或Shenandoah，以减少停顿时间并提高应用性能。 6. **安全性**：Java的安全性一直是其关注的重点。新版本可能会增强加密算法、加强沙箱机制，或提供新的安全API来应对不断演变的网络安全威胁。 7. **性能优化**：Java持续致力于提升运行效率。JDK 19可能会包含JIT（Just-In-Time）编译器的改进，或者对HotSpot虚拟机的优化，以提升应用程序的运行速度。 8. **Javadoc更新**：作为“帮助文档”，Java API 19的Javadoc会详尽地解释所有公共类和方法，包括新添加的API。它对于开发者理解和使用Java库至关重要。 9. **实验性特性**：JDK 19可能包含一些实验性的特性或API，供开发者试用并提供反馈，这些特性可能在后续版本中正式推出。 10. **兼容性和向后兼容**：虽然引入新特性，但Java始终重视兼容性。JDK 19应当能够运行基于早期版本编写的大部分代码，除非明确声明需要特定的新功能。要深入学习和使用Java API 19，开发者需要阅读官方Javadoc，理解新特性，同时通过实践来熟练掌握。压缩包中的"docs"文件可能就是这些官方文档，包含详细的API参考和使用示例，是学习和工作的宝贵资源。

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javaJava API19，java JDK19帮助文档（10451个子文件）

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<!DOCTYPE HTML> <html lang="en"> <head>  <title>Uses of Class java.lang.String (Java SE 19 & JDK 19)</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <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.min.css" title="Style"> <link rel="stylesheet" type="text/css" href="../../../../jquery-ui.overrides.css" title="Style"> <script type="text/javascript" src="../../../../script.js"></script> <script type="text/javascript" src="../../../../script-dir/jquery-3.6.0.min.js"></script> <script type="text/javascript" src="../../../../script-dir/jquery-ui.min.js"></script> </head> <body class="class-use-page"> <script type="text/javascript">var pathtoroot = "../../../../"; loadScripts(document, 'script');</script> <noscript> <div>JavaScript is disabled on your browser.</div> </noscript> <div class="flex-box"> <header role="banner" class="flex-header"> <nav role="navigation">  <div class="top-nav" id="navbar-top"><button id="navbar-toggle-button" aria-controls="navbar-top" aria-expanded="false" aria-label="Toggle navigation links"><span class="nav-bar-toggle-icon"> </span><span class="nav-bar-toggle-icon"> </span><span class="nav-bar-toggle-icon"> </span></button> <div class="skip-nav"><a href="#skip-navbar-top" title="Skip navigation links">Skip navigation links</a></div> <div class="about-language"><div style="margin-top: 14px;"><strong>Java SE 19 & JDK 19</strong> </div></div> <ul id="navbar-top-firstrow" class="nav-list" 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="nav-bar-cell1-rev">Use</li> <li><a href="../package-tree.html">Tree</a></li> <li><a href="../../../../preview-list.html">Preview</a></li> <li><a href="../../../../new-list.html">New</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#use">Help</a></li> </ul> </div> <div class="sub-nav"> <div id="navbar-sub-list"></div> <div class="nav-list-search"><a href="../../../../search.html">SEARCH</a> <input type="text" id="search-input" disabled placeholder="Search"> <input type="reset" id="reset-button" disabled value="reset"> </div> </div>  <span class="skip-nav" id="skip-navbar-top"></span></nav> </header> <div class="flex-content"> <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="caption"><span>Packages that use <a href="../String.html" title="class in java.lang">String</a></span></div> <div class="summary-table two-column-summary"> <div class="table-header col-first">Package</div> <div class="table-header col-last">Description</div> <div class="col-first even-row-color"><a href="#com.sun.jarsigner">com.sun.jarsigner</a></div> <div class="col-last even-row-color"> <div class="block">This package comprises the interfaces and classes used to define the signing mechanism used by the <code>jarsigner</code> tool.</div> </div> <div class="col-first odd-row-color"><a href="#com.sun.java.accessibility.util">com.sun.java.accessibility.util</a></div> <div class="col-last odd-row-color"> <div class="block">Provides a collection of interfaces and classes that compose the Java Accessibility Utilities.</div> </div> <div class="col-first even-row-color"><a href="#com.sun.jdi">com.sun.jdi</a></div> <div class="col-last even-row-color"> <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> </div> <div class="col-first odd-row-color"><a href="#com.sun.jdi.connect">com.sun.jdi.connect</a></div> <div class="col-last odd-row-color"> <div class="block">This package defines connections between the virtual machine using the JDI and the target virtual machine.</div> </div> <div class="col-first even-row-color"><a href="#com.sun.jdi.connect.spi">com.sun.jdi.connect.spi</a></div> <div class="col-last even-row-color"> <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> </div> <div class="col-first odd-row-color"><a href="#com.sun.jdi.event">com.sun.jdi.event</a></div> <div class="col-last odd-row-color"> <div class="block">This package defines JDI events and event processing.</div> </div> <div class="col-first even-row-color"><a href="#com.sun.jdi.request">com.sun.jdi.request</a></div> <div class="col-last even-row-color"> <div class="block">This package is used to request that a JDI event be sent under specified conditions.</div> </div> <div class="col-first odd-row-color"><a href="#com.sun.management">com.sun.management</a></div> <div class="col-last odd-row-color"> <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> </div> <div class="col-first even-row-color"><a href="#com.sun.net.httpserver">com.sun.net.httpserver</a></div> <div class="col-last even-row-color"> <div class="block">Provides a simple high-level Http server API, which can be used to build embedded HTTP servers.</div> </div> <div class="col-first odd-row-color"><a href="#com.sun.nio.sctp">com.sun.nio.sctp</a></div> <div class="col-last odd-row-color"> <div class="block">A Java API for Stream Control Transport Protocol.</div> </div> <div class="col-first even-row-color"><a href="#com.sun.security.auth">com.sun.security.auth</a></div> <div class="col-last even-row-color"> <div class="block">Provides implementations of <a href="../../security/Principal.html" title="interface in java.security"><code>Principal</code></a>.</div> </div> <div class="col-first odd-row-color"><a href="#com.sun.security.auth.login">com.sun.security.auth.login</a></div> <div class="col-last odd-row-color"> <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> </div> <div class="col-first even-row-color"><a href="#com.sun.security.auth.module">com.sun.security.auth.module</a></div> <div class="col-last even-row-color"> <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> </div> <div class="col-first odd-row-color"><a href="#com.sun.security.jgss">com.sun.security.jgss</a></div> <div class="col-last odd-row-color"> <div class="block">This package defines classes and interfaces for the JDK extensions to the GSS-API.</div> </div> <div class="col-first even-row-color"><a href="#com.sun.source.doctree">com.sun.source.doctree</a></div> <div class="col-last even-row-color"> <div class="block">Provides interfaces to represent documentation comments as abstract syntax trees (AST).</div> </div> <div class="col-first odd-row-color"><a href="#com.sun.source.tree">c