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The Java Language
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There are a number of restrictions that apply to annotation declarations First, no annotation can inherit another Second, all methods declared by an annotation must be without parameters Furthermore, they must return one of the following:
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A primitive type, such as int or double An object of type String or Class An enum type Another annotation type An array of one of the preceding types
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Annotations cannot be generic In other words, they cannot take type parameters (Generics are described in 14) Finally, annotation methods cannot specify a throws clause
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his chapter introduces two of Java s most important packages: io and applet The io package supports Java s basic I/O (input/output) system, including file I/O The applet package supports applets Support for both I/O and applets comes from Java s core API libraries, not from language keywords For this reason, an in-depth discussion of these topics is found in Part II of this book, which examines Java s API classes This chapter discusses the foundation of these two subsystems so that you can see how they are integrated into the Java language and how they fit into the larger context of the Java programming and execution environment This chapter also examines the last of Java s keywords: transient, volatile, instanceof, native, strictfp, and assert It concludes by examining static import and by describing another use for the this keyword
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As you may have noticed while reading the preceding 12 chapters, not much use has been made of I/O in the example programs In fact, aside from print( ) and println( ), none of the I/O methods have been used significantly The reason is simple: most real applications of Java are not text-based, console programs Rather, they are graphically oriented programs that rely upon Java s Abstract Window Toolkit (AWT) or Swing for interaction with the user Although text-based programs are excellent as teaching examples, they do not constitute an important use for Java in the real world Also, Java s support for console I/O is limited and somewhat awkward to use even in simple example programs Text-based console I/O is just not very important to Java programming The preceding paragraph notwithstanding, Java does provide strong, flexible support for I/O as it relates to files and networks Java s I/O system is cohesive and consistent In fact, once you understand its fundamentals, the rest of the I/O system is easy to master
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Part I:
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The Java Language
Streams
Java programs perform I/O through streams A stream is an abstraction that either produces or consumes information A stream is linked to a physical device by the Java I/O system All streams behave in the same manner, even if the actual physical devices to which they are linked differ Thus, the same I/O classes and methods can be applied to any type of device This means that an input stream can abstract many different kinds of input: from a disk file, a keyboard, or a network socket Likewise, an output stream may refer to the console, a disk file, or a network connection Streams are a clean way to deal with input/output without having every part of your code understand the difference between a keyboard and a network, for example Java implements streams within class hierarchies defined in the javaio package
Byte Streams and Character Streams
Java defines two types of streams: byte and character Byte streams provide a convenient means for handling input and output of bytes Byte streams are used, for example, when reading or writing binary data Character streams provide a convenient means for handling input and output of characters They use Unicode and, therefore, can be internationalized Also, in some cases, character streams are more efficient than byte streams The original version of Java (Java 10) did not include character streams and, thus, all I/O was byte-oriented Character streams were added by Java 11, and certain byte-oriented classes and methods were deprecated This is why older code that doesn t use character streams should be updated to take advantage of them, where appropriate One other point: at the lowest level, all I/O is still byte-oriented The character-based streams simply provide a convenient and efficient means for handling characters An overview of both byte-oriented streams and character-oriented streams is presented in the following sections
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