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Packages are containers-for-classes used to keep the class namespace compartmentalized.

Using Package,

1. We can define classes inside a package that are notaccessible by the code outside that package.

2. We can define class members that are only accessible by code inside that package.

3. We can have a class stored in a package withoutconcern that it will collide with some other class (havin same name), stored else where.

Package is basically a collection of predefined or ready-made classes that can be used in your java program to make shorter as well as easier. Package- import java.lang.*; is always implicitly called when you write a java program.

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