Packages in Java allow classes to be grouped together logically and prevent naming collisions. The key Java packages are:
1) java.lang contains classes for primitive types, strings, math functions, and exceptions.
2) java.util contains utility classes like vectors and hash tables.
3) java.io contains stream classes for input/output.
Packages are organized hierarchically, for example the awt package contains classes for graphical user interfaces. Classes in packages can be accessed using their fully qualified name or by importing the package. Users can also create their own packages by specifying the package name at the top of Java files in a corresponding directory structure.
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About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
CW RADAR, FMCW RADAR, FMCW ALTIMETER, AND THEIR PARAMETERSveerababupersonal22
It consists of cw radar and fmcw radar ,range measurement,if amplifier and fmcw altimeterThe CW radar operates using continuous wave transmission, while the FMCW radar employs frequency-modulated continuous wave technology. Range measurement is a crucial aspect of radar systems, providing information about the distance to a target. The IF amplifier plays a key role in signal processing, amplifying intermediate frequency signals for further analysis. The FMCW altimeter utilizes frequency-modulated continuous wave technology to accurately measure altitude above a reference point.
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Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
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2. Packages
• Packages are Java’s way of grouping a number of
related classes and/or interfaces together into a single
unit. That means, packages act as “containers” for
classes.
• The benefits of organising classes into packages are:
- The classes contained in the packages of other
programs/applications can be reused.
- In packages classes can be unique compared with
classes in other packages. That two classes in two
different packages .
3. Java Foundation Packages
Java provides a large number of classes groped into different packages
based on their functionality
• The six foundation Java packages are:
- java.lang :
Contains classes for primitive types, strings, math functions, threads, and
exception.
- java.util :
Contains classes such as vectors, hash tables, date etc.
- java.io :
Stream classes for I/O .
- java.awt :
Classes for implementing GUI – windows, buttons, menus etc.
- java.net :
Classes for networking .
- java.applet :
Classes for creating and implementing app.
4. Using System Packages
• The packages are organised in a hierarchical structure .For example, a
package named “java” contains the package “awt”, which in turn contains
various classes required for implementing GUI (graphical user interface).
Java “java” Package containing
“lang”, “awt”,.. packages;
Can also contain classes.
awt package containing classes.
Classes containing methods
lang
graphics
font
image
awt
5. Accessing Classes from Packages
There are two ways of accessing the classes stored in packages:
• Using fully qualified class name
java.lang.Math.sqrt(x);
• Import package and use class name directly
import java.lang.Math
Math.sqrt(x);
• Selected or all classes in packages can be imported:
• Implicit in all programs: import java.lang.*;
• package statement(s) must appear first
import package.class;
import package.*;
6. Creating Packages
Java supports a keyword called “package” for creating user-defined
packages. The package statement must be the first statement in a Java
source file (except comments and white spaces) followed by one or more
classes.
package myPackage;
public class ClassA {
// class body
}
class ClassB {
}
Package name is “myPackage” and classes are considered as part of
this package; The code is saved in a file called “ClassA.java” and located in
a directory called “myPackage”.
7. Using a Package
• Let us store the code listing below in a file named“ClassA.java” within
subdirectory named “myPackage”within the current directory (say “abc”).
• package myPackage;
• public class ClassA {
• // class body
• public void display()
• {
• System.out.println("Hello, I am ClassA");
• }
• }
• class ClassB {
• // class body
• }
8. Using a Package
Within the current directory (“abc”) store the following
code in a file named“ClassX.java”
import myPackage.ClassA;
public class ClassX
{
public static void main(String args[])
{
ClassA objA = new ClassA();
objA.display();
}
}
9. Compiling and Running
• en ClassX.java is compiled, the compiler compiles it and places .class file in
current directly. If .class of ClassA in subdirectory “myPackage” is not
found, it comples ClassA also.
• Note: It does not include code of ClassA into ClassX ✞
• When the program ClassX is run, java loader looks for ClassA.class file in a
package called “myPackage” and loads it.
10. Using a Package
Let us store the code listing below in a file named“ClassA.java” within
subdirectory named“secondPackage” within the current directory
(say“abc”).
public class ClassC {
// class body
public void display()
{
System.out.println("Hello, I am ClassC");
}
}
11. Using a Package
• Within the current directory (“abc”) store the following code in a file
named“ClassX.java”
• import myPackage.ClassA;
• import secondPackage.ClassC;
• public class ClassY
• {
• public static void main(String args[])
• {
• ClassA objA = new ClassA();
• ClassC objC = new ClassC();
• objA.display();
• objC.display();
• }
• }