Как создать класс в java vs code

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Saturday, June 20, 2020

Create a Java Package and Class in Visual Studio Code

After you’ve created a Java project in Visual Studio Code (VS Code), you’re probably wanting to create the initial package and a Java Class. This guide will cover just that. This example configuration uses the Maven build system and Maven folder architecture, although essentially the same process can happen with a basic Java project too.

src/main/java	Java source directory in a Maven project.
src/main/test	Testing source directory in a Maven project.
src/main/webapp	Webapp directory with static resources and server instructions.

Now you’re ready to add your source code to the project but you’ll need a package or namespace to add it to. The first thing you’ll want to do is add your first base Java package. For example if my package is named com.brandondonnelson, the first base directory would work out to be; src/main/java/com/brandondonnelson.

For example, in this image, you’ll see the Java source folder contains the first package. The first base package being com.brandondonnelson.

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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

If you run into any issues when following this tutorial, you can contact us by clicking the Report an issue button below.

If you need to install VS Code, download it here.

Supported Java versions

VS Code works with all major versions of Java SE up to 14.

Setting up Visual Studio Code for Java Development

Installing a Java Development Kit (JDK)

Before going through this tutorial, your development environment must have a Java SE Development Kit (JDK) installed. If it doesn’t, you can download and install a JDK from one of these sources:

Configuring your development environment to use a JDK

Your development environment needs to know where the JDK is located. A common way to do this is setting the value of the JAVA_HOME system environment variable to the install location of the JDK, for example, C:\Program Files\Java\jdk-13.0.2 . Or if you want to configure only VS Code to use the JDK, use the java.home setting in VS Code’s User or Workspace settings.

To help you get started quickly, there is a special Installer of Visual Studio Code for Java developers.

Note: The installer is currently only available for Windows. For other operating systems, you will need to manually install a JDK, VS Code, and Java extensions. We’re working on the macOS version. Please stay tuned.

The package can be used as a clean install, or you can also use it to update an existing development environment to add Java or VS Code. After you’ve downloaded and opened it, the installer automatically tries to detect a JDK, VS Code, and essential Java extensions. During install, it downloads the stable versions of those tools from trusted online sources then installs and configures them.

You can also add Java support to VS Code by installing the popular Microsoft Java Extension Pack, which includes these extensions:

You can also select which extensions you would like to install separately. For this tutorial, the only required extensions are

If a JDK is not already installed, the Java Extension Pack provides links to download a reliable JDK.

Settings for the JDK

To access various settings for using the JDK, bring up the Command Palette ( kb(workbench.action.showCommands) ) and use the command Java: Configure Java Runtime.

The Java Extension Pack, also 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: Getting Started from the Command Palette ( kb(workbench.action.showCommands) ).

Note: To configure multiple JDKs, see Configure JDK. To enable Java preview features, see How can I use VS Code with new Java versions

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.

You can also create a Java project using the Java: Create Java Project command. Bring up the Command Palette ( kb(workbench.action.showCommands) ) 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.

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.

Running and debugging your program

To run and debug Java code, set a breakpoint, then either press kb(workbench.action.debug.start) on your keyboard or use the Run > Start Debugging menu item. You can also use the Run|Debug CodeLens options 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 replacement and conditional breakpoints.

More features

The editor also has much more capability for your Java workload.

• Editing Java explains how to navigate and edit Java in more details
• Debugging illustrates all the key features of the Java Debugger
• Testing provides comprehensive support for JUnit and TestNG framework
• Java Project Management shows you how to use a project view and work with Maven
• Spring Boot and Tomcat and Jetty demonstrate great framework support
• Java Web Apps shows how to work with Java Web App in VS Code

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Источник

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.

If you run into any issues when following this tutorial, you can contact us by entering an issue.

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.

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, which includes these extensions:

The Extension Pack for Java 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 ( ⇧⌘P (Windows, Linux 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 supports Java version 1.5 or above.

Note: To configure JDKs for your projects, see Configure Runtime for Projects. To enable Java preview features, see How can I use VS Code with new Java versions.

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:

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 language status item with a loading icon on the right side of the Status Bar showing the language status is busy. After it finishes loading, you can hover on the language status item and find the loading process has been finished successfully. You can also choose to pin the status item in the status bar.

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.

You can also create a Java project using the Java: Create Java Project command. Bring up the Command Palette ( ⇧⌘P (Windows, Linux 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.

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.

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 and Debug view.

The debugger also supports advanced features such as Hot Code Replace and conditional breakpoints.

More features

The editor also has many more capabilities to assist with your Java workload.

• Editing Java explains how to navigate and edit Java in more details
• Debugging illustrates all the key features of the Java Debugger
• Testing provides comprehensive support for JUnit and TestNG framework
• Java Project Management shows you how to use a project view and work with Maven
• Spring Boot and Tomcat and Jetty demonstrate great framework support
• Java Web Apps shows how to work with Java Web App in VS Code

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