Java Packages (Cont.)

Built-in Packages (Cont.)
Some of the commonly used built-in packages are
java.math
Provides classes for performing arbitrary-precision integer arithmetic (BigInteger) and arbitrary-precision decimal arithmetic (BigDecimal).

java.awt
The AWT (Abstract Windowing Toolkit) package contains classes for implementing the components for graphical user interfaces like buttons.

JavaFX.*
JavaFX is a GUI toolkit for Java. JavaFX makes it easier to create desktop applications and games in Java.

java.io
Contains classes for supporting input/output operations.

java.lang
Contains language support classes (e.g., classes defining primitive data types and math operations). This package is automatically imported.

java.net
Contains classes for supporting networking operations or client-server applications.

java.sql
This package is used for retrieving the data from data base and performing various operations on data base.

java.util
Contains miscellaneous utility classes which implement data structures like linked list and dictionary, and provide a string tokenizer, a random-number generator, a bit array, etc.

The complete list can be found at Oracles website: https://docs.oracle.com/javase/8/docs/api/.

Review: Java Packages
    Which Java package is imported by default?

      java.io
      java.lang
      java.net
      java.util
        Result:




      “May you live every day of your life.”    
      ― Jonathan Swift