# Getting Started with Java in VS Code
This tutorial shows you how to write and run Hello World program in Java with Visual Studio Code. It also covers a few advanced features, which you can explore by reading other documents in this section.
For an overview of the features available for Java in VS Code, see Java Language Overview (opens new window).
If you run into any issues when following this tutorial, you can contact us by entering an issue (opens new window).
# Setting up VS Code for Java development
# Coding Pack for Java
To help you set up quickly, you can install the Coding Pack for Java, which includes VS Code, the Java Development Kit (JDK), and essential Java extensions. The Coding Pack can be used as a clean installation, or to update or repair an existing development environment.
Install the Coding Pack for Java - Windows (opens new window)
Install the Coding Pack for Java - macOS (opens new window)
Note: The Coding Pack for Java is only available for Windows and macOS. For other operating systems, you will need to manually install a JDK, VS Code, and Java extensions.
# Installing extensions
If you are an existing VS Code user, you can also add Java support by installing the Extension Pack for Java (opens new window), which includes these extensions:
- Language Support for Java™ by Red Hat (opens new window)
- Debugger for Java (opens new window)
- Test Runner for Java (opens new window)
- Maven for Java (opens new window)
- Project Manager for Java (opens new window)
- Visual Studio IntelliCode (opens new window)
Install the Extension Pack for Java
The Extension Pack for Java (opens new window) provides a Quick Start guide and tips for code editing and debugging. It also has a FAQ that answers some frequently asked questions. Use the command Java: Tips for Beginners from the Command Palette (Ctrl+Shift+P) to launch the guide.
You can also install extensions separately. The Extensions Guide is provided to help you. You can launch the guide with the Java: Extensions Guide command.
For this tutorial, the only required extensions are:
# Installing and setting up a Java Development Kit (JDK)
To use Java within Visual Studio Code, you need to install a Java Development Kit (JDK) on your local environment. JDK is a software development environment used for developing Java applications.
# Supported Java versions
The Extension Pack for Java (opens new window) supports Java version 1.5 or above.
Note: To configure JDKs for your projects, see Configure Runtime for Projects (opens new window). To enable Java preview features, see How can I use VS Code with new Java versions (opens new window).
# Installing a Java Development Kit (JDK)
If you have never installed a JDK before and need to install one, we recommend you to choose from one of these sources:
- Amazon Corretto (opens new window)
- Azul Zulu (opens new window)
- Eclipse Adoptium's Temurin (opens new window)
- Microsoft Build of OpenJDK (opens new window)
- Oracle Java SE (opens new window)
- Red Hat build of OpenJDK (opens new window)
- SapMachine (opens new window)
# Creating a source code file
Create a folder for your Java program and open the folder with VS Code. Then in VS Code, create a new file and save it with the name Hello.java
. When you open that file, the Java Language Server automatically starts loading, and you should see a loading icon on the right side of the Status Bar. After it finishes loading, you will see a thumbs-up icon.
Note: If you open a Java file in VS Code without opening its folder, the Java Language Server might not work properly.
VS Code will also try to figure out the correct package for the new type and fill the new file from a template. See Create new file (opens new window).
You can also create a Java project using the Java: Create Java Project command. Bring up the Command Palette (Ctrl+Shift+P) and then type java
to search for this command. After selecting the command, you will be prompted for the location and name of the project. You can also choose your build tool from this command.
Visual Studio Code also supports more complex Java projects — see Project Management (opens new window).
# Editing source code
You can use code snippets to scaffold your classes and methods. VS Code also provides IntelliSense for code completion, and various refactor methods.
To learn more about editing Java, see Java Editing (opens new window).
# Running and debugging your program
To run and debug Java code, set a breakpoint, then either press F5 on your keyboard or use the Run > Start Debugging menu item. You can also use the Run|Debug CodeLens option in the editor. After the code compiles, you can see all your variables and threads in the Run view.
The debugger also supports advanced features such as Hot Code Replace (opens new window) and conditional breakpoints.
For more information, see Java Debugging (opens new window).
# More features
The editor also has many more capabilities to assist with your Java workload.
- Editing Java (opens new window) explains how to navigate and edit Java in more details
- Debugging (opens new window) illustrates all the key features of the Java Debugger
- Testing (opens new window) provides comprehensive support for JUnit and TestNG framework
- Java Project Management (opens new window) shows you how to use a project view and work with Maven
- Spring Boot (opens new window) and Tomcat and Jetty (opens new window) demonstrate great framework support
- Java Web Apps (opens new window) shows how to work with Java Web App in VS Code
原文链接: https://code.visualstudio.com/docs/java/java-tutorial