What are the commonly used packages in Java?

Commonly used package introduction:

java.lang: This package provides basic classes for Java programming, such as Object, Math, String, StringBuffer, System, Thread, etc. It is difficult to write Java code without using this package.

java.util: This package provides the collection framework, legacy collection classes, event model, date and time implementation, internationalization and various utility classes (string token generator, random number generator and bit array).

java.io: This package provides system input and output through the file system, data streams, and serialization.

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java.net: This package provides classes for implementing network applications and development.

java.sql: This package provides an API for using the Java language to access and process data stored in a data source (usually a relational database).

java.awt: These two packages provide classes for GUI design and development. The java.awt package provides all classes for creating interfaces and drawing graphics images, while the javax.swing package provides a set of "lightweight" components, trying to make these components work the same way on all platforms.​

java.text: Provides classes and interfaces for processing text, dates, numbers, and messages in a natural language-independent way.

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