Java class library core framework latest update and version description
Java class library core framework latest update and version description
Java is a widely used programming language. It has a wealth of core library core frameworks. They have experienced multiple updates and improvements over time.This article will introduce the latest update of the core framework of the Java library and provide some example code.
1. Latest version description of the core framework of Java library
At present, the latest version of the core framework of the Java library is Java SE 16.This version was released on March 16, 2021, and provided many new features and improvements.The following are some noteworthy updates:
1. Simplify concurrent programming
The Java SE 16 introduced a new concurrent programming tool called the "mode matching example".It can simplify the code of type check using the Instanceof operator and provide more intuitive syntax.This makes it easier to deal with various types of objects in the concurrent environment.
Example code:
if (obj instanceof String str) {
System.out.println(str.length());
}
2. Private interface method
Java SE 16 allows private static methods and instance methods to define privately in the interface.This allows developers to reuse the same code during the implementation of the interface, while maintaining the packaging of the interface.
Example code:
public interface MyInterface {
private static void myPrivateStaticMethod() {
// Private static method implementation
}
private void myPrivateMethod() {
// Private instance method implementation
}
public default void myPublicMethod() {
myPrivateStaticMethod();
myPrivateMethod();
}
}
3. Allow nested single notes
Java SE 16 allows nested other single notes in one -line comments.This is useful for adding more annotations or temporary disable codes in the annotation.
Example code:
// This is a single notes
// This is another one -line annotation
// Todo: You need to optimize this method
2. Example code
The following are common examples of some Java class libraries core framework:
1. Use the Java collection class ArrayList to create a list and add, obtain and delete elements.
import java.util.ArrayList;
public class Example {
public static void main(String[] args) {
ArrayList<String> list = new ArrayList<>();
list.add ("Element 1");
list.add ("Element 2");
list.add ("Element 3");
System.out.println(list.get(1));
list.remove(0);
System.out.println(list.size());
}
}
2. Use Java's multi -threaded category to create a simple thread and start.
public class Example {
public static void main(String[] args) {
Thread thread = new Thread(() -> {
System.out.println("Hello, World!");
});
thread.start();
}
}
3. Use the Java file class to perform basic file operations, such as reading and writing files.
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
public class Example {
public static void main(String[] args) throws IOException {
File file = new File("example.txt");
FileWriter writer = new FileWriter(file);
writer.write("Hello, World!");
writer.close();
Scanner scanner = new Scanner(file);
while (scanner.hasNextLine()) {
System.out.println(scanner.nextLine());
}
scanner.close();
}
}
These example code show some common usage of the core framework of the Java library.Although the core framework of the Java library is constantly being updated, these examples can help you better understand and use the core framework of the Java library.
Summarize:
This article introduces the latest update of the core framework of the Java library and provides you with some example code.The latest version and function that constantly understands and familiar with the core framework of the Java library is an important step in becoming a Java developer.
