system.properties

javaのsystem propertyを確認する方法
System.getProperties()

public class SampleProject {
    public static void main(String[] args) {
        Properties ps = System.getProperties();
        ps.list(System.out);
    }
}

sun.desktop=windows
awt.toolkit=sun.awt.windows.WToolkit
java.specification.version=11
sun.cpu.isalist=amd64
sun.jnu.encoding=MS932
java.class.path=C:\Users\java\Documents\NetBeansProje...
java.vm.vendor=Oracle Corporation
sun.arch.data.model=64
user.variant=
java.vendor.url=https://openjdk.java.net/
user.timezone=
os.name=Windows 10
java.vm.specification.version=11
sun.java.launcher=SUN_STANDARD
user.country=JP
sun.boot.library.path=C:\Program Files\Java\jdk-11.0.17\bin
sun.java.command=sampleproject.SampleProject
jdk.debug=release
sun.cpu.endian=little
user.home=C:\Users\java
user.language=ja
java.specification.vendor=Oracle Corporation
jdk.module.path=C:\Users\java\Documents\NetBeansProje...
java.version.date=2022-10-18
java.home=C:\Program Files\Java\jdk-11.0.17
file.separator=\
java.vm.compressedOopsMode=Zero based
line.separator=

java.specification.name=Java Platform API Specification
java.vm.specification.vendor=Oracle Corporation
java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment
user.script=
sun.management.compiler=HotSpot 64-Bit Tiered Compilers
java.runtime.version=11.0.17+10-LTS-269
user.name=java
path.separator=;
os.version=10.0
java.runtime.name=Java(TM) SE Runtime Environment
file.encoding=UTF-8
java.vm.name=Java HotSpot(TM) 64-Bit Server VM
java.vendor.version=18.9
java.vendor.url.bug=https://bugreport.java.com/bugreport/
java.io.tmpdir=C:\Users\java\AppData\Local\Temp\
java.version=11.0.17
user.dir=C:\Users\java\Documents\NetBeansProje...
os.arch=amd64
java.vm.specification.name=Java Virtual Machine Specification
java.awt.printerjob=sun.awt.windows.WPrinterJob
sun.os.patch.level=
java.library.path=C:\Program Files\Java\jdk-11.0.17\bin...
java.vendor=Oracle Corporation
java.vm.info=mixed mode
java.vm.version=11.0.17+10-LTS-269
sun.io.unicode.encoding=UnicodeLittle
java.class.version=55.0

javacで英語を使用したい場合、user.languageを使用してシステム値を設定する

javac -J-Duser.language=en xxx.java