java package

Packages

            Packages are nothing but Putting classes and interfaces together in a bundle or envelope.

• Package is the collection of several classes , interfaces and sub packages

• There are two types of packages in java




• Built in/In Built packages - java, java.awt, java.io



• User defined packages - MyPackage {perfume, dresses}



Keywords

• Import - import keyword is used to bring a package to the current

class

• Package – package keyword is used to define a package

                Example

import java.io.*;

package MyPack;

public class Perfume{}

public class Dress{}

# classes Perfume and Dress belongs to the package MyPack


Advantages

Java Package is used to categorize classes and interfaces to maintain easily

java Package Provides access Protection

java Package removes naming collision

Comments

Post a Comment

Popular posts from this blog

Unit 3 : Regression

  Unit 3: Regression   Linear Regression: Prediction using Linear Regression, Gradient Descent, Linear Regression with one Variable, Linear Regression with Multiple Variables, Polynomial Regression, Feature Scaling/Selection. Logistic Regression: Classification using Logistic Regression, Logistic Regression vs. Linear Regression, Logistic Regression with one Variable and with Multiple Variables.   Linear Regression: What is Regression?             Regression is the mathematical method that used to find the value of an unknown variable with the help of another variable. For example X+5=Y , where Y is in between 10   then the value of X be 5 X 5 Y 10   What is Linear Regression?             Linear Regression is also the statistical method that used to find the value of an unknown variable wi...
Read more

Operating System - Unit - 4 Memory Management and File Managment

Image
 Unit 4 - Part I - Memory Management Physical and Virtual Address Space Physical Address  identifies a physical location of required data in a memory. The user never directly deals with the physical address but can access by its corresponding logical address. The user program generates the logical address and thinks that the program is running in this logical address but the program needs physical memory for its execution, therefore, the logical address must be mapped to the physical address by MMU before they are used. The term Physical Address Space is used for all physical addresses corresponding to the logical addresses in a Logical address space. Logical Address  is generated by CPU while a program is running. The logical address is virtual address as it does not exist physically, therefore, it is also known as Virtual Address. This address is used as a reference to access the physical memory location by CPU. The term Logical Address Space is used for the set of ...
Read more

Unit 1 - Introduction to Operating Sytem & Unit 2 - Process Characterization

  Courtesy : https://www.tutorialtpoint.net/p/operating-system-tutorial.html   What is Operating System?             Operating System is System software installed on any computer device once at first to do all mandatory processes of computer from booting to shutdown.             Operating System is a computer program to do control and handle all kind of process of the computer.             Operating System is an interface between hardware and application software.             An operating system is software which performs all management tasks like §   file management §   memory management §   process management §   handling input and output §   Controlling peripheral devices such as disk drives and printers. ...
Read more