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ArrayList, LinkedList, Vector HashMap, Hashtable, LinkedHashMap, TreeMap HashSet, LinkedHashSet, TreeSet PriorityQueue
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Data structures based on positional access. Data structures that map keys to values. Data structures based on element uniqueness. Queues typically order elements in a FIFO manner. Priority queues order elements according to a supplied comparator.
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Various other classes and interfaces reside in the java.util package. Date and time facilities are represented by the Date, Calendar, and TimeZone classes. Geographical regions are represented by the Locale class. The Currency class represents currencies per the ISO 4217 standard. A random number generator is provided by the Random class. And StringTokenizer breaks strings into tokens. Several other classes exist within java.util, but these (and the collection interfaces and classes) are the ones most likely to be seen on the exam. The initially discussed classes are represented in Figure 1-2. Many packages have related classes and interfaces that have unique functionality, so they are included in their own subpackages. For example, regular expressions are stored in a subpackage of the Java utilities (java.util) package.The subpackage is named java.util.regex and houses the Matcher and Pattern classes. Where needed, consider creating subpackages for your own projects.
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Various utility classes
Calendar
TimeZone
Locale
Represents an instance in time
Provides conversions of time instances to calendar fields
Represents a time zone and adjusts for daylight savings time
Represents a geographical, political or cultural region
Currency
Random
StringTokenizer
Timer
Represents a currency: ISO 4217
Provides a random number generator
Provides a means to break a string into tokens
Provides a task scheduling facility
1:
Packaging, Compiling, and Interpreting Java Code
Java Basic Input/Output apI
The Java Basic Input/Output API is contained in the package java.io. This API provides functionality for general system input and output in relationships to data streams, serialization, and the file system. Data stream classes include byte-stream subclasses of the InputStream and OutputStream classes. Data stream classes also include character-stream subclasses of the Reader and Writer classes. Figure 1-3 depicts part of the class hierarchy for the Reader and Writer abstract classes. Other important java.io classes and interfaces include File, FileDescriptor, FilenameFilter, and RandomAccessFile. The File class provides a representation of file and directory pathnames. The FileDescriptor class provides a means to function as a handle for opening files and sockets. The FilenameFilter interface, as its name implies, defines the functionality to filter filenames. The RandomAccessFile class allows for the reading and writing of files to specified locations.
the Java Networking apI
The Java Networking API is contained in the package java.net. This API provides functionality in support of creating network applications. The API s key classes and interfaces are represented in Figure 1-4. You probably will not see few, if any, of these classes on the exam but the figure will help you conceptualize what s in the java.net package. The improved performance New I/O API (java.nio) package, which provides for nonblocking networking and the socket factory support package (javax.net), is not on the exam.
FIgUre 1-3
java.io Reader Writer
Reader and Writer class hierarchy
BufferedReader
InputStreamReader
FilterReader
BufferedWriter
OutputStreamWriter
FilterWriter
FileReader
FileWriter
Understanding Package-Derived Classes
FIgUre 1-4 java.net Socket
Various classes of the networking API
ServerSocket
Inet4Address
Provides for the implementation of client sockets
Provides for the implementation of server sockets
Represents a Uniform Resource Locator (URL)
Represents an Internet Protocol version 4 (IPv4) address
Java abstract Window toolkit apI
The Java Abstract Window Toolkit API is contained in the package java.awt. This API provides functionality for creating heavyweight components in regards to creating user interfaces and painting associated graphics and images. The AWT API was Java s original GUI API and has been superseded by the Swing API. Where Swing is now recommended, certain pieces of the AWT API still remain commonly used, such as the AWT Focus subsystem that was reworked in J2SE 1.4. The AWT Focus subsystem provides for navigation control between components. Figure 1-5 depicts these major AWT elements.
Java swing apI
The Java Swing API is contained in the package javax.swing. This API provides functionality for creating lightweight (pure-Java) containers and components. The Swing API superseded the AWT API. Many of the new classes were simply prefaced with the addition of J in contrast to the legacy AWT component equivalent.
FIgUre 1-5
java.awt
AWT major elements
AWT Heavyweight Component API
AWT Focus Subsystem
1:
Packaging, Compiling, and Interpreting Java Code
SCEnArIO & SOlUTIOn
You need to create basic Java Swing components such as buttons, panes, and dialog boxes. Provide the code to import the necessary classes of a package. You need to support text-related aspects of your Swing components. Provide the code to import the necessary classes of a package. You need to implement and configure basic pluggable look-and-feel support. Provide the code to import the necessary classes of a package. You need to use Swing event listeners and adapters. Provide the code to import the necessary classes of a package.
// Java Swing API package import javax.swing.*; // Java Swing API text subpackage import javax.swing.text.*; // Java Swing API plaf subpackage import javax.swing.plaf.*; // Java Swing API event subpackage import javax.swing.event.*;
For example, Swing uses the class JButton to represent a button container, whereas AWT uses the class Button. Swing also provides look-and-feel support, allowing for universal style changes of the GUI s components. Other features include tooltips, accessibility functionality, an event model, and enhanced components such as tables, trees, text components, sliders, and progress bars. Some of the Swing API s key classes are represented in Figure 1-6. See 11 for more information on the Swing API as a client-side user-interface solution.
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