What are the requirements of package in Java?

What is the need of package in Java?

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.

What is package qualification in Java?

A fully-qualified class name in Java contains the package that the class originated from. An example of this is java. util. ArrayList. The fully-qualified class name can be obtained using the getName() method.

What is package in Java and its use?

A package in Java is used to group related classes. Think of it as a folder in a file directory. We use packages to avoid name conflicts, and to write a better maintainable code. … Built-in Packages (packages from the Java API) User-defined Packages (create your own packages)

How can we create and use package in Java program?

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.

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What is the most important feature of Java?

The most significant feature of Java is that it provides platform independence which leads to a facility of portability, which ultimately becomes its biggest strength. Being platform-independent means a program compiled on one machine can be executed on any machine in the world without any change.

What are the types of errors in Java?

There are three kinds of errors: syntax errors, runtime errors, and logic errors. These are errors where the compiler finds something wrong with your program, and you can’t even try to execute it.

Is overriding possible in Java?

In Java, methods are virtual by default. We can have multilevel method-overriding. Overriding vs Overloading : … Overriding is about same method, same signature but different classes connected through inheritance.

How do I install packages in Java?


  1. Download Windows x64 Java 8u242.
  2. Unzip Java bundle, place the tar bundle under C:Program FilesJava (administrative privileges will be required)
  3. Open a command prompt and navigate to C:Program FilesJavabin
  4. Test the Java version: …
  5. Additional configuration may be required to:

What is a package give an example?

Package refers to as a container that contains all the parts combined. Example: The computer processor consists of all the parts required for the working of a system. Example: ms-office is a software that has sub software applications/modules like: ms-word. ms-powerpoint.

What is the Java lang package?

lang Description. Provides classes that are fundamental to the design of the Java programming language. The most important classes are Object , which is the root of the class hierarchy, and Class , instances of which represent classes at run time.

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