What\'s the Difference Between Java System Properties and Environment Variables?

Java System Properties vs Environment Variables in a JVM

Question:

In a Java Virtual Machine (JVM), what distinguishes system properties obtained through System.getProperties() and environment variables retrieved using System.getenv()?

Answer:

System Properties:

• Set on the Java command line using -Dpropertyname=value.
• Can be modified at runtime using System.setProperty() or System.getProperties().load() methods.
• Retrieved using System.getProperty(String key) or System.getProperty(String key, String def).

Environment Variables:

• Set in the operating system environment.
• Not modifiable at runtime.
• Accessible through System.getenv(String name).

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