JDK

JDK (Java Development Kit) is a software development toolkit of Java language. Its cross-platform, object-oriented, security, multi-threading and rich API characteristics make it one of the commonly used tools in the field of software development.

Software features

Cross-platform development

Write Once, Run Anywhere (Write Once, Run Anywhere), achieving operating system independence through JVM.

object-oriented programming

It supports encapsulation, inheritance, polymorphism and other features, and is suitable for building large software systems.

rich ecology

It has a large number of open source frameworks and tools such as Spring, Hibernate, Apache Kafka, etc.

security

Built-in bytecode verification, security manager and other mechanisms to prevent malicious code execution.

Multi-threading support

Provides Thread class and synchronized keyword to simplify concurrent programming.

Software function

Compile Java source code:

The javac compiler in the JDK is responsible for compiling Java source code files into bytecode files (.class files), which is the basis for running Java applications.

Run Java program:

The java command in the JDK is used to run compiled Java bytecode files. It starts the JVM and loads the specified class file, and then executes the main method in it.

Provide development tools:

JDK provides a variety of development tools, such as debuggers, refactoring tools, document generators, etc., which can help developers write, debug and maintain Java applications more efficiently.

Contains Java class library:

JDK contains Java platform standard class libraries, which provide class libraries and interfaces required by Java applications, including input and output, network communication, multi-threading and other functions.

Supports modular systems:

Starting from JDK 9, Java has introduced a modular system (JPMS), making the organization and management of Java code more flexible and efficient.

Integrated development environment (IDE) support:

JDK can be integrated with a variety of IDEs (such as Eclipse, IntelliJ IDEA, etc.). These IDEs provide rich development functions and debugging tools, further improving the efficiency and quality of Java development.

FAQ

Class not found exception

Possible reasons: the class path does not contain the required class files, the JAR package is not correctly added to the class path, the IDE configuration is incorrect, etc.

Solution: Ensure that all necessary class files and JAR packages are included in the classpath; check the project's build path settings in the IDE to ensure that all dependencies are configured correctly.

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