Java in Visual Studio Code

Since the company was closed, I tried to prepare the Java environment with Visual Stuido Code (hereinafter VS Code), which has been evolving all the time recently. The platform is Ubuntu 18.04. Try using Gradle as well.

VS Code installation

You can download it from the official website, but if you use Ubuntu, you can use Ubuntu Make, so you can use it. Now version 1.28.2 is installed.

umake ide visual-studio-code
umake --version
> 16.11.1

Java Extension Pack Plugin

If you enter "java" in the plugin search, a lot of it will appear, but if you include "Java Extension Pack", it seems that the following plugins are included together, so I will include this.

• Language Support for Java™ by Red Hat
• Debugger for Java
• Java Test Runner
• Maven Project Explorer

Reboot to reload and you're done.

Java preparation

The latest is Java 11, but this time Java 8 that was originally included is used instead. The installation procedure will be omitted here as it will hit as many times as you like if you google. Check about $ JAVA_HOME.

echo $JAVA_HOME
> /usr/lib/jvm/java-8-oracle

Gradle preparation

Official currently says 4.10.2, but I used 3.4.1 installed with apt.

apt install gradle

Project directory generation

If you have gradle, you can easily make it, so I left it to you. The point is to specify --type java-application.

mkdir project_name_dir
cd project_name_dir
gradle init --type java-application
tree
.
├── build.gradle
├── gradle
│   └── wrapper
│       ├── gradle-wrapper.jar
│       └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
├── settings.gradle
└── src
    ├── main
    │   └── java
    │       └── App.java
    └── test
	└── java
	    └── AppTest.java

By the way, the contents of build.gradle look like this (comment line deleted)

build.gradle

apply plugin: 'java'
apply plugin: 'application'
repositories {
    jcenter()
}
dependencies {
    compile 'com.google.guava:guava:20.0'
    testCompile 'junit:junit:4.12'
}
mainClassName = 'App'

Operation check

Try using gradle to perform tasks that you might use. It's still a template, so everything should work fine.

gradle build
gradle run
gradle check
gradle clean

VS Code settings

Select the created project directory and work.

JAVA_HOME settings

Set the value of $ JAVA_HOME in" java.home "of settings.json. You can edit the file directly or set it in the GUI.

grep java.home ~/.config/Code/User/settings.json
> "java.home": "/usr/lib/jvm/java-8-oracle"

Task settings

Set .vscode/tasks.json to execute the gradle command.

{
    "version": "2.0.0",
    "tasks": [
        {
            "label": "build",
            "type": "shell",
            "command": "./gradlew build"
        },
        {
            "label": "run",
            "type": "shell",
            "command": "./gradlew run",
            "group": {
                "kind": "build",
                "isDefault": true
            }
        },
        {
            "label": "clean",
            "type": "shell",
            "command": "./gradlew clean"
        },
        {
            "label": "check",
            "type": "shell",
            "command": "./gradlew check"
        }
    ]
}

Executing a task

F1 key →" run task "→ Select the task set in tasks.json. You can use Ctrl + Shift + B to execute the default task run. If you set a breakpoint, it will stop at that point, so you could debug without being aware of it.

Impressions

I can't say anything yet because I just touched it,

--It was not possible to refactor including the directory name such as the package name. --Shortcut keys such as code jumps are similar to Visual Studio (eclipse users may be confused) ――I want you to do your best to complement the documentation comment out.

I would like to expect future growth.