Serial terminal program with horizontal scroll bar.

#Serial terminal program with horizontal scroll bar. windows

In addition, Java 2 includes the new Input Method I / O Input Method Framework and means of communicating with additional I / O devices, such as a light pen or a Broglie keyboard, called Accessibility.ДЄll of these Java 2 tools: AWT, Swing, Java 2D, DnD, Input Method Framework, and Accessibility make up the Java Graphic Tools Library (Java Foundation Classes).ДЄ description of each of these tools will make up a whole book, so we have to limit ourselves to presenting only fixed assets of the AWT library. In Java 2, the AWT library has been greatly expanded by adding new drawing tools, text and image rendering, called Java 2D, and tools that move the text using the DnD (Drag and Drop) method.

It is included in the Java 2 SDK as the main graphic class library that implements the idea of вЂ‹вЂ‹'100% Pure Java', along with AWT. The Swing class library was supplied as an add-on to JDK 1.1. All components of the AWT library were rewritten, so the Swing library can be used independently, despite the fact that all the classes from it extend the AWT library classes. This interesting feature of the 'light' components is called PL & F (Pluggable Look and Feel) or 'plaf.'ДЄn extensive library of lightweight Java components, called Swing, was created.

#Serial terminal program with horizontal scroll bar. windows

Moreover, the application can be developed in such a way that after its launch it was possible to select a particular type: Motif, Metal, Windows 95 or some other, and change this type at any moment of work. 'Light' components look the same everywhere they retain the look and feel that was set at creation. Such components began to be called 'lightweight' (lightweight) in contrast to the components implemented through peer-interfaces, called 'heavy' (heavy). It added the ability to create components that are completely written in Java and are not dependent on peer interfaces. In JDK 1.1, the AWT library has been redesigned. It is because of this implementation of peer interfaces and other 'native' methods, written mainly in C ++, that for each platform we have to release our own version of JDK. Therefore, AWT graphic objects in each graphical environment look like this environment: in MS Windows, Motif, OpenLook, OpenWindows, everywhere windows created in AWT look like native windows.

These objects interact closely while the application is running. When displaying an object created in a Java application and based on a peer interface, a paired to peer-to-peer object of the graphics subsystem of the operating system is created on the screen and displayed on the screen. The Java class library based on peer interfaces is called AWT (Abstract Window Toolkit). Such interfeys were called peer interfaces. In each graphical shell, this is done in its own way, by means of this shell with the help of graphic libraries of the given operating system. On the other hand, to work with the screen in a specific graphical environment, these interfaces are implemented in each such environment separately.

Java applications use these methods to place and move graphic objects, resize them, and interact with objects. AWT library classes implement these interfaces for building applications. In the first version of JDK, the problem was solved as follows: interfaces were developed containing methods for working with graphic objects. You need a class library that is independent of the specific graphics system. In Java technology, the matter is complicated by the fact that Java applications must work in any or at least in many graphical environments. Each class of such a library immediately describes a graphical component, controlled by the methods of this and other classes. To facilitate the creation of windows and their components, class libraries have been written: MFC, Motif, OpenLook, Qt, Tk, Xview, OpenWindows, and many others. Graphic APIs contain hundreds of functions. Each of them has its own rules for constructing windows and their components: menus, input fields, buttons, lists, scroll bars. There are many different graphics systems: MS Windows, X Window System, Macintosh.