"Java JDK8官方API文档使用指南" 资源-CSDN下载

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jdk1.8

java8

需积分: 50 99 浏览量 2018-11-30 16:01:33 上传评论 1 收藏 42.89MB ZIP 举报

**Java 8 API 文档详解** Java 8（也称为 JDK 1.8）是 Java 平台标准版的一个重大更新，它引入了许多创新特性，极大地提升了开发效率和代码的可读性。JDK 8 API 文档是理解这些新特性和功能的重要资源，它包含了详细的类、接口和方法描述，帮助开发者深入理解和使用 Java 8。 1. **函数式编程：Lambda 表达式** - Lambda 表达式是 Java 8 的核心特性之一，它允许以简洁的方式表示匿名函数。例如 `(args) -> expression`，这里的 `args` 是参数列表，`expression` 是函数体。 - 函数式接口：Lambda 表达式需要与函数式接口关联，如 `Runnable`、`Callable` 和新的 `Function`、`Predicate` 等接口。 - 方法引用和构造器引用：提供了更直观的语法来引用已有的方法或构造器。 2. **Stream API** - Stream API 提供了一种对集合进行操作的新方式，支持链式操作和并行处理，提高了数据处理效率。 - 常用方法包括 `filter()`、`map()`、`reduce()`、`collect()` 等，可以方便地进行数据过滤、转换和聚合操作。 - 并行流（Parallel Streams）利用多核处理器优势，实现高效的数据处理。 3. **日期和时间 API（java.time）** - Java 8 引入了全新的日期和时间 API，取代了过时的 `java.util.Date` 和 `java.util.Calendar`，提供了更加友好和强大的时间操作。 - `LocalDate`、`LocalTime` 和 `LocalDateTime` 分别代表日期、时间及日期时间，而 `ZonedDateTime` 包含了时区信息。 - `TemporalAdjusters` 提供了一系列用于调整日期和时间的工具，如下一个工作日、下个月的第一天等。 4. **Optional 类** - `Optional` 类是用来解决空指针异常的，它封装了一个可能为 null 的值，提供了一种更安全的类型表示。 - 使用 `Optional` 可以避免空指针异常，提高代码的健壮性，但过度使用可能会增加代码复杂性。 5. **接口的默认方法和静态方法** - 默认方法允许在接口中定义实现，这使得接口可以在不破坏向后兼容性的前提下扩展功能。 - 静态方法则允许在接口中添加工具方法，可以直接通过接口调用，无需创建实现类实例。 6. **方法和构造器的引用类型（Method References 和 Constructor References）** - 这是 Lambda 表达式的补充，可以更简洁地引用已有方法或构造器，减少代码冗余。 7. **类型推断的增强** - Java 8 改进了类型推断，使得编译器可以更准确地推断泛型参数类型，简化代码编写。 8. **新的集合工厂方法** - 在 `List`、`Set` 和 `Map` 接口中增加了新的工厂方法，如 `of()` 和 `ofNullable()`，用于创建不可变集合，增强了代码的简洁性和安全性。 9. ** Nashorn JavaScript 引擎** - Java 8 添加了一个内置的 JavaScript 引擎，允许 Java 代码直接执行 JavaScript 脚本，实现 Java 和 JavaScript 之间的互操作。 10. **并发改进** - 新的 `ForkJoinPool` 和 `CompletableFuture` 类提供了一种更高效的异步编程模型，便于实现并行计算。通过阅读和研究 JDK 8 API 文档，开发者能够更好地掌握这些新特性，并在实际项目中充分利用它们，提高代码质量和开发效率。同时，文档还包含了丰富的示例代码和详细解释，是学习和解决问题的重要参考。

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jdk8-api文档（2000个子文件）

stylesheet.css 13KB

dejavu.css 9KB

String.html 5.06MB

index-7.html 4.23MB

Object.html 3.1MB

index-19.html 2.31MB

index-9.html 1.49MB

index-3.html 1.44MB

serialized-form.html 1.4MB

overview-tree.html 1.38MB

constant-values.html 1.19MB

index-16.html 1.06MB

index-18.html 1.03MB

index-1.html 1024KB

IOException.html 1009KB

Serializable.html 906KB

Override.html 871KB

index-20.html 823KB

compact3-summary.html 795KB

index-4.html 706KB

SQLException.html 678KB

index-13.html 613KB

Throwable.html 609KB

allclasses-frame.html 598KB

JComponent.html 595KB

index-5.html 584KB

compact2-summary.html 579KB

Class.html 546KB

package-use.html 517KB

allclasses-noframe.html 515KB

index-6.html 503KB

Graphics.html 474KB

index-21.html 470KB

index-14.html 460KB

Component.html 452KB

compact1-summary.html 447KB

ResultSet.html 432KB

index-23.html 419KB

Exception.html 397KB

index-22.html 386KB

index-2.html 384KB

DatabaseMetaData.html 383KB

Component.html 382KB

index-12.html 372KB

BaseRowSet.html 341KB

JTable.html 337KB

index-8.html 334KB

Deprecated.html 334KB

Arrays.html 332KB

List.html 321KB

SynthPainter.html 312KB

CallableStatement.html 311KB

index-15.html 284KB

index-10.html 278KB

package-use.html 276KB

JComponent.html 272KB

Files.html 269KB

Character.html 261KB

Map.html 259KB

Dimension.html 259KB

JTree.html 254KB

RowSet.html 253KB

SuppressWarnings.html 244KB

InputStream.html 237KB

EventListener.html 227KB

SynthContext.html 226KB

JOptionPane.html 225KB

Rectangle.html 224KB

Any.html 224KB

Character.UnicodeBlock.html 221KB

ObjectName.html 221KB

package-use.html 217KB

Window.html 216KB

Color.html 215KB

Locale.html 211KB

ConcurrentHashMap.html 203KB

ImageReader.html 195KB

Set.html 195KB

IllegalArgumentException.html 195KB

JTextComponent.html 194KB

JList.html 193KB

AbstractButton.html 192KB

Cloneable.html 188KB

KeyEvent.html 187KB

JInternalFrame.html 185KB

ConcurrentSkipListMap.html 183KB

ZonedDateTime.html 183KB

CompletableFuture.html 183KB

Toolkit.html 182KB

TypeMismatch.html 180KB

ComponentUI.html 179KB

BigDecimal.html 179KB

Collection.html 178KB

String.html 175KB

InvalidValue.html 175KB

Container.html 175KB

Calendar.html 175KB

JFileChooser.html 175KB

Collections.html 174KB

Container.html 173KB

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  <html lang="en"> <head>  <title>Uses of Class java.lang.String (Java Platform SE 8 )</title> <meta name="date" content="2018-10-06"> <link rel="stylesheet" type="text/css" href="../../../stylesheet.css" title="Style"> <script type="text/javascript" src="../../../script.js"></script> </head> <body> <script type="text/javascript"> </script> <noscript> <div>JavaScript is disabled on your browser.</div> </noscript>  <div class="topNav"><a name="navbar.top">  </a> <div class="skipNav"><a href="#skip.navbar.top" title="Skip navigation links">Skip navigation links</a></div> <a name="navbar.top.firstrow">  </a> <ul class="navList" title="Navigation"> <li><a href="../../../overview-summary.html">Overview</a></li> <li><a href="../package-summary.html">Package</a></li> <li><a href="../../../java/lang/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"><strong>Java™ Platform<br>Standard Ed. 8</strong></div> </div> <div class="subNav"> <ul class="navList"> <li>Prev</li> <li>Next</li> </ul> <ul class="navList"> <li><a href="../../../index.html?java/lang/class-use/String.html" target="_top">Frames</a></li> <li><a href="String.html" target="_top">No Frames</a></li> </ul> <ul class="navList" id="allclasses_navbar_top"> <li><a href="../../../allclasses-noframe.html">All Classes</a></li> </ul> <div> <script type="text/javascript"> </script> </div> <a name="skip.navbar.top">  </a></div>  <div class="header"> <h2 title="Uses of Class java.lang.String" class="title">Uses of Class<br>java.lang.String</h2> </div> <div class="classUseContainer"> <ul class="blockList"> <li class="blockList"> <table class="useSummary" border="0" cellpadding="3" cellspacing="0" summary="Use table, listing packages, and an explanation"> <caption><span>Packages that use <a href="../../../java/lang/String.html" title="class in java.lang">String</a></span><span class="tabEnd"> </span></caption> <tr> <th class="colFirst" scope="col">Package</th> <th class="colLast" scope="col">Description</th> </tr> <tbody> <tr class="altColor"> <td class="colFirst"><a href="#java.applet">java.applet</a></td> <td class="colLast"> <div class="block">Provides the classes necessary to create an applet and the classes an applet uses to communicate with its applet context.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><a href="#java.awt">java.awt</a></td> <td class="colLast"> <div class="block">Contains all of the classes for creating user interfaces and for painting graphics and images.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><a href="#java.awt.color">java.awt.color</a></td> <td class="colLast"> <div class="block">Provides classes for color spaces.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><a href="#java.awt.datatransfer">java.awt.datatransfer</a></td> <td class="colLast"> <div class="block">Provides interfaces and classes for transferring data between and within applications.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><a href="#java.awt.dnd">java.awt.dnd</a></td> <td class="colLast"> <div class="block">Drag and Drop is a direct manipulation gesture found in many Graphical User Interface systems that provides a mechanism to transfer information between two entities logically associated with presentation elements in the GUI.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><a href="#java.awt.event">java.awt.event</a></td> <td class="colLast"> <div class="block">Provides interfaces and classes for dealing with different types of events fired by AWT components.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><a href="#java.awt.font">java.awt.font</a></td> <td class="colLast"> <div class="block">Provides classes and interface relating to fonts.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><a href="#java.awt.geom">java.awt.geom</a></td> <td class="colLast"> <div class="block">Provides the Java 2D classes for defining and performing operations on objects related to two-dimensional geometry.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><a href="#java.awt.im.spi">java.awt.im.spi</a></td> <td class="colLast"> <div class="block">Provides interfaces that enable the development of input methods that can be used with any Java runtime environment.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><a href="#java.awt.image">java.awt.image</a></td> <td class="colLast"> <div class="block">Provides classes for creating and modifying images.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><a href="#java.awt.image.renderable">java.awt.image.renderable</a></td> <td class="colLast"> <div class="block">Provides classes and interfaces for producing rendering-independent images.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><a href="#java.awt.print">java.awt.print</a></td> <td class="colLast"> <div class="block">Provides classes and interfaces for a general printing API.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><a href="#java.beans">java.beans</a></td> <td class="colLast"> <div class="block">Contains classes related to developing <em>beans</em> -- components based on the JavaBeans™ architecture.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><a href="#java.beans.beancontext">java.beans.beancontext</a></td> <td class="colLast"> <div class="block">Provides classes and interfaces relating to bean context.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><a href="#java.io">java.io</a></td> <td class="colLast"> <div class="block">Provides for system input and output through data streams, serialization and the file system.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><a href="#java.lang">java.lang</a></td> <td class="colLast"> <div class="block">Provides classes that are fundamental to the design of the Java programming language.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><a href="#java.lang.annotation">java.lang.annotation</a></td> <td class="colLast"> <div class="block">Provides library support for the Java programming language annotation facility.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><a href="#java.lang.instrument">java.lang.instrument</a></td> <td class="colLast"> <div class="block">Provides services that allow Java programming language agents to instrument programs running on the JVM.</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><a href="#java.lang.invoke">java.lang.invoke</a></td> <td class="colLast"> <div class="block">The <code>java.lang.invoke</code> package contains dynamic language support provided directly by the Java core class libraries and virtual machine.</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><a href="#java.lang.management">java.lang.management</a></td> <td class="colLast"> <div class="block">Provides the management interfaces for monitoring and management of the Java virtu

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