Oracle Help Center网页System.setProperty sets the system property indicated by the specified key to the value argument. See the syntax, parameters, and examples of this method in the Java Platform 更多内容请查看https://docs.oracle.com/javase/8/docs/api/java/lang/System.html
oracle.comSystem Properties (The Java™ Tutorials > Essential Java 网页Learn how to read and write system properties using the System class and Properties objects. System properties are configuration settings for the Java platform environment.更多内容请查看https://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html