System.getProperties 的属性从何而来？

Question

当我调用方法 System.getProperties(); 并打印它们时，它给出了一个没有设置属性的键值对的大列表。 Java从哪里得到那些属性来自？

Answer 1

来自托管 Java 的操作系统（环境）。检查 Oracle documentation

In Properties, we examined the way an application can use Properties objects to maintain its configuration. The Java platform itself uses a Properties object to maintain its own configuration. The System class maintains a Properties object that describes the configuration of the current working environment. System properties include information about the current user, the current version of the Java runtime, and the character used to separate components of a file path name.

Key                 Meaning
-----------------   --------------------------------------------------------------------------
"file.separator"    Character that separates components of a file path. This is "/" on UNIX and "\" on Windows.
"java.class.path"   Path used to find directories and JAR archives containing class files. Elements of the class path are separated by a platform-specific character specified in the path.separator property.
"java.home"         Installation directory for Java Runtime Environment (JRE)
"java.vendor"       JRE vendor name
"java.vendor.url"   JRE vendor URL
"java.version"      JRE version number
"line.separator"    Sequence used by operating system to separate lines in text files
"os.arch"           Operating system architecture
"os.name"           Operating system name
"os.version"        Operating system version
"path.separator"    Path separator character used in java.class.path
"user.dir"          User working directory
"user.home"         User home directory
"user.name"         User account name

System.getProperties 的属性从何而来？

Where do the properties of System.getProperties come from?

java

properties