9/29/2017 0 Comments Core Java Api Free DownloadJava Class Library - Wikipedia. The Java Class Library (JCL) is a set of dynamically loadable libraries that Java applications can call at run time. Because the Java Platform is not dependent on a specific operating system, applications cannot rely on any of the platform- native libraries. Instead, the Java Platform provides a comprehensive set of standard class libraries, containing the functions common to modern operating systems. JCL serves three purposes within the Java Platform: Like other standard code libraries, they provide the programmer a well- known set of useful facilities, such as container classes and regular expression processing. The library provides an abstract interface to tasks that would normally depend heavily on the hardware and operating system, such as network access and file access. Some underlying platforms may not support all of the features a Java application expects. In these cases, the library implementation can either emulate those features or provide a consistent way to check for the presence of a specific feature. Implementation and configuration[edit]JCL is almost entirely written in Java, except for the parts that need direct access to the hardware and operating system (such as for I/O, or bitmap graphics). The classes that give access to these functions commonly use Java Native Interface wrappers to access operating system APIs. Almost all of JCL is stored in a single Java archive file called "rt. JRE and JDK distributions. The Java Class Library (rt. The runtime uses the bootstrap class loader to find the JCL. The upcoming Java Module System (planned for Java 9) will break the monolithic "rt. Jar file, and modularize the Java Class Library itself in several modules with specified dependencies.[2]Conformance[edit]Any Java implementation must pass the Java Technology Compatibility Kit tests for compliance, which includes JCL tests. This document is the API specification for the Java™ Platform, Standard Edition. This Java tutorial is to demonstrate the Dropbox Java API which can be used to manage the files in a Dropbox account via Java code. This is fairly a simple. Java Instrumentation will give a demonstration of how powerful Java is. Most importantly, this power can be realized by a developer for innovative means. F. 500 Chapter 17 Accessing Databases with JDBC © Prentice Hall and Sun Microsystems Press. Personal use only. J2EE training from the author: http://courses. Main features[edit]JCL Features are accessed through classes provided in packages. I/O and networking access the platform file system, and more generally networks through the java. For networking, SCTP is available through com. Mathematics package: java. Collections and Utilities : built- in Collection data structures, and utility classes, for Regular expressions, Concurrency, logging and Data compression. GUI and 2. D Graphics: the AWT package (java. GUI operations and binds to the underlying native system. It also contains the 2. D Graphics API. The Swing package (javax. AWT and provides a platform- independent widget toolkit, as well as a Pluggable look and feel. It also deals with editable and non- editable text components. Sound: interfaces and classes for reading, writing, sequencing, and synthesizing of sound data. Text: java. text deals with text, dates, numbers, and messages. Image package: java. APIs to write, read, and modify images. XML: SAX, DOM, St. AX, XSLT transforms, XPath and various APIs for Web services, as SOAP protocol and JAX- WS. CORBA and RMI APIs, including a built- in ORBSecurity is provided by java. Databases: access to SQL databases via java. Access to Scripting engines: The javax. Scripting language. Applets: java. applet allows applications to be downloaded over a network and run within a guarded sandbox. Java Beans: java. Introspection and reflection: java. Class represents a class, but other classes such as Method and Constructor are available in java. Licensing[edit]Prior licenses[edit]Before the release of Open. JDK, the JDK was based on a proprietary license. Following their promise to release a fully buildable JDK based almost completely on free and open source code in the first half of 2. Sun released the complete source code of the Class Library under the GPL on May 8, 2. Sun from third parties who did not want their code to be released under an open source license.[4] Sun's goal was to replace the parts that remain proprietary and closed source with alternative implementations and make the Class Library completely free and open source. Until December 2. JDK was made available by Sun then Oracle as Binary Plugs[5] which were required to build the JDK but not necessary to run it. May 2. 00. 7[update], the only part of the Class library that remained proprietary and closed- source (4% as of May 2. Open. JDK 7,[6] and less than 1% as of May 2. Open. JDK 6[7][8]) was: [9][1. Since the first May 2. Sun, with the help of the community, released as open source or replaced with open source alternatives almost all the encumbered code: Open source release[edit]Beginning in December 2. JDK open.[2. 0]Alternative implementations[edit]GNU Classpath is the other main free software class library for Java. Contrary to other implementations, it only implements the Class Library, and is used by many free Java runtimes (like Kaffe, Sable. VM, Jam. VM, CACAO). Apache Harmony was another free software class library. Its aim was to implement the other parts of the Java stack (Virtual Machine, Compiler, and other tools required for any Java implementation). See also[edit]References[edit]External links[edit].
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