The version history and update content of the "Core" framework in the Java Library
The "Core" framework in the Java class library is a very important part of the development of Java. It contains many foundations and universal classes and interfaces, providing developers with various common functions and tools.The history and update of the framework are very important for developers who are familiar with Java development.The following will introduce the version history and update content of the "Core" framework in the Java library.
1. Java 1.0:
Java 1.0 is the "Core" framework in the earliest version of Java. It contains the most basic classes and interfaces, such as Object, String, Math, etc.At the same time, it also provides basic input and output functions, such as standard input output and file input and output.
Example code:
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
2. Java 1.2:
The Java 1.2 version expands and optimizes the "Core" framework.Introduce some commonly used classes and interfaces, such as ArrayList, HashMap, etc. in the set framework.In addition, new abnormal processing mechanisms have been added, providing strong development tools, such as the Java compiler (Javac) and Java debugger (JDB).
Example code:
import java.util.ArrayList;
public class ArrayListExample {
public static void main(String[] args) {
ArrayList<String> list = new ArrayList<>();
list.add("Java");
list.add("Python");
list.add("C++");
System.out.println(list);
}
}
3. Java 1.4:
Java 1.4 has made some major improvements in the "Core" framework.These include enhanced abnormal processing mechanisms, new regular expression engines, and improved thread management functions.In addition, internal enumeration types, assertions and advanced file processing functions are introduced.
Example code:
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class RegexExample {
public static void main(String[] args) {
String text = "The quick brown fox jumps over the lazy dog.";
Pattern pattern = Pattern.compile("\\b\\w{5}\\b");
Matcher matcher = pattern.matcher(text);
while (matcher.find()) {
System.out.println(matcher.group());
}
}
}
4. Java 5:
The Java 5 version has further enhanced and improved the "Core" framework.The most important update is to introduce generic types, allowing developers to use type safe sets in the set framework.In addition, the characteristics of automatic loading and boxing, enumeration, variable parameters, annotations and collaborative return types were introduced.
Example code:
import java.util.ArrayList;
import java.util.List;
public class GenericsExample {
public static void main(String[] args) {
List<String> list = new ArrayList<>();
list.add("Java");
list.add("Python");
list.add("C++");
for (String item : list) {
System.out.println(item);
}
}
}
5. Java 8:
The Java 8 version introduced some important updates in the "Core" framework.The most significant improvement is the introduction of the concept of functional programming, supporting Lambda expression and Stream API.In addition, new dates and time APIs, default methods and static methods, Optional class and other functions are added.
Example code:
import java.util.Arrays;
import java.util.List;
public class LambdaExample {
public static void main(String[] args) {
List<String> list = Arrays.asList("Java", "Python", "C++");
list.forEach(item -> System.out.println(item));
}
}
Summary: The "Core" framework in the Java class library has experienced several major improvements and enhancements in different versions.These updates enable developers to develop Java applications more efficiently and provide more functions and tools to meet different development needs.Familiar with these versions of history and updates is very important for Java developers, and can better apply the "Core" framework in the Java class library for development.
