How to create package in java

What are the steps to create a package in Java?

How to Create Your Own Packages in Java

  1. Pick a name for your package. …
  2. Choose a directory on your hard drive to be the root of your class library. …
  3. Create subdirectories within the root directory for your package name. …
  4. Add the root directory for your package to the ClassPath environment variable.

What is package in Java with example?

Package in Java is a mechanism to encapsulate a group of classes, sub packages and interfaces. Packages are used for: Preventing naming conflicts. For example there can be two classes with name Employee in two packages, college. … Employee and college.

How can you create your own package and add class in that?

How to create package in Java

  1. First create a directory within name of package.
  2. Create a java file in newly created directory.
  3. In this java file you must specify the package name with the help of package keyword.
  4. Save this file with same name of public class. …
  5. Now you can use this package in your program.

Can we create a package inside a package in Java?

Example 1: Java packages

To create a class inside a package, declare the package name in the first statement in your program. A class can have only one package declaration. Now lets see how to use this package in another program.

How do you set classpath?

PATH and CLASSPATH

  1. Select Start, select Control Panel. double click System, and select the Advanced tab.
  2. Click Environment Variables. In the section System Variables, find the PATH environment variable and select it. …
  3. In the Edit System Variable (or New System Variable) window, specify the value of the PATH environment variable. Click OK.
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Why pointers are not used in Java?

Security: By not allowing pointers, Java effectively provides another level of abstraction to the developer. No pointer support make Java more secure because they point to memory location or used for memory management that loses the security as we use them directly.

What is the default package in Java?

The default package is an unnamed package. The unnamed package contains java classes whose source files did not contain a package declaration. The purpose of default packahe is for convenience when developing small or temporary applications or when just beginning development.

What are different types of packages in Java?

A package in Java is a group of similar types of classes, interfaces, and sub-packages. They can be categorized into two categories, the built-in package ( java, lang, util, awt, javax, swing, net, io, sql et), and user-defined package.

What is Java Util?

Java. util package contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes. This reference will take you through simple and practical methods available in java.

How do you create a package?

To create a package, you choose a name for the package (naming conventions are discussed in the next section) and put a package statement with that name at the top of every source file that contains the types (classes, interfaces, enumerations, and annotation types) that you want to include in the package.

How do I create a SQL package?

To create package specs, use the SQL statement CREATE PACKAGE . A CREATE PACKAGE BODY statement defines the package body. For information on the CREATE PACKAGE SQL statement, see Oracle Database SQL Reference. For information on the CREATE PACKAGE BODY SQL statement, see Oracle Database SQL Reference.

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Why packages are used in Java?

Packages are used in Java in order to prevent naming conflicts, to control access, to make searching/locating and usage of classes, interfaces, enumerations and annotations easier, etc.

What is sub package in Java?

Package inside the package is called the subpackage. It should be created to categorize the package further. Let’s take an example, Sun Microsystem has definded a package named java that contains many classes like System, String, Reader, Writer, Socket etc.

How do I import Java?

To import java package into a class, we need to use java import keyword which is used to access package and its classes into the java program. Use import to access built-in and user-defined packages into your java source file so that your class can refer to a class that is in another package by directly using its name.

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