What are java advanced features

Java advanced features mainly include collection framework and generics, utility classes, input and output processing, annotations and multi-threading, network programming and XML technology.

Collection framework

is a set of interfaces and classes (located in the java.util package) with excellent performance and easy use to solve Arrays cannot adapt well to dynamic changes in the number of elements in storage, and have low search efficiency defects

Collection interface: Map, Collection (sub-interface List, Set), Iterator

Interface implementation class: HashMap TreeMap, ArrayList LinkedList, HashSet TreeSet implements map, list, and set interfaces

Collection tool classes: Arrays, Collections Provide algorithms for operating on collection elements

Generic collection

Generics are parameterized types, which implement constraints by specifying the element type in the collection

Function: Use the type of the object as a parameter and specify it to other classes or methods to ensure type conversion Security and stability

Utility class

Java API: Java application programming interface, Java help documentation

Utility class: By Java Common classes provided by API

Be sure to read more about Java API when learning this part.

Input/output and reflection

Commonly used base classes for IO streams

Note: () Inside are subclasses such as File **Class, Buffered** class

Buffered** class has a buffer and a readLine() method that reads content line by line

Byte stream

Byte input stream: InputStream (FileInputStream, BufferedInputStream)

Byte output stream: OutputStream (FileOutputStream, BufferedOutStream)

Character stream

Character input stream: Reader (FileReader, BufferedReader)

Character output stream: Writer (FileWriter, BufferedWriter)

Java Reflection

Reflection : Refers to the fact that a Java program can be self-describing and self-controlling. It allows the program to load, detect, and use classes that are completely unknown during compilation when it is running.

Reflection mechanism: refers to dynamically obtaining class information and dynamically obtaining class information in the running state. Function of calling object method

Annotation

Special mark in Java code. It provides a formal method for adding additional information to the code that cannot be expressed in a Java program. Annotations can be regarded as modifiers, modifying program elements.

Annotations can be read during compilation, class loading, and runtime. Comments will not be read by the program.

Thread Scheduling

Multiple threads are in the runnable state, and thread scheduling will determine the order in which threads enter the runnable state based on priority.

The priority of the thread is expressed from 1 to 10, 10 has the highest priority, and the default value is 5

Network Programming Technology

Network: Yes A virtual platform for information transmission, reception, and sharing that connects information from various points, surfaces, and entities to achieve resource sharing

Network programming: Programming that uses sockets to achieve inter-process communication purposes

Introduction to XML

XML (Extensibel Markup Language): Extensible Markup Language is a simple data storage language that uses a series of simple tags to describe data.

Features: Independent of operating system and development platform; standardized and unified

Function: data interaction; configuration of applications and websites; cornerstone of Ajax

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