Java 8之后的新特性(九):密封类与接口 Sealed Classes and Interfaces 这周,我会讲到Java8之后的一个非常重要的特性,就是密封类与接口。 这个特性并不是让代码更简洁的一个点,它是让Java的设计更健壮的一个特性。如果你希望在一些特别的场景下,设计出更健壮的程序。那密封类 Sealed Class就是你不可错过的一...
如果 C 的常量池中包含某个CONSTANT_Class_info 成员,且这个成员所表示的类或接口不属于任何一个包,那么 C 的ClassFile 结构的属性表中就必须含有对应的 InnerClasses 属性。InnerClasses 属性是在 JDK 1.1 中为了支持内部类和内部接口而引入的,位于 ClassFile结构的属性表。 InnerClasses_attribute { u2 attribute...
All Classes and InterfacesInterfacesClassesExceptions Class Description CannotInitializeException Exception thrown during the initialization of a customized Java task to be executed by an Import/Export Connector (IEC) application in your system landscape. DataCollection This Java interface represents a data ...
JavaEE 一开始叫 J2EE,后来改名为 JavaEE,它是 JavaSE 的一个扩展,这是我们企业级开发使用的一个版本,包括一些 Java Web 工具包。 JavaME(J2ME)(Java 2 Platform Micro Edition,java平台微型版)。 JavaME 一般用于移动设备和嵌入式设备(比如手机、PDA、电视机顶盒和打印机)上运行的应用程序提供一个健壮且灵活...
All Classes and InterfacesInterfacesClassesEnum ClassesRecord ClassesException ClassesAnnotation Interfaces Class Description AboutEvent Event sent when the application is asked to open its about window. AboutHandler An implementer receives notification when the app is asked to show its about dialog. Absent...
The programming language used for developing your Android applications is Oracle's Java SE, which was created by Sun Microsystems and later acquired by Oracle. As you learned in Chapter 2, Java SE stands for Java Standard Edition, though many programmers
No matter how they work internally, all streams present the same simple model to programs that use them: Astreamis a sequence of data. Two of the more popular classes used in thejava.iopackage areFileInputStreamandFileOutputStream. Both create byte streams linked to files. To learn more abo...
import java.io.FileInputStream; import java.io.IOException; import java.math.BigDecimal; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.Marshaller; import javax.xml.bind.Unmarshaller; import primer.po.*; A JAXBContext instance is created for handling ...
The <c>java.nio.file</c> package defines interfaces and classes for the Java virtual machine to access files, file attributes, and file systems. This API may be used to overcome many of the limitations of the java.io.File class. The #toPath toPath method may be used to obtain a Path...
Java.IO Assembly: Mono.Android.dll Returns a proxy class that implements the interfaces named in a proxy class descriptor; subclasses may implement this method to read custom data from the stream along with the descriptors for dynamic proxy classes, allowing them to use an alternate loading mechan...