How to add new System Properties in java

Is it possible to add new values to Java System Properties. If there is any how can introduce new keys with there corresponding values in Java System Properties.

How do I set custom system properties in Java?

Programmatically, a system property can be set using the setProperty method of the System object, and also via the setProperty method of the Properties object that can be obtained from System via getProperties.

Where is Java system Properties file?

properties file located in users->appdata->locallow->sun->java>deployment and also directly putting key=value in runtime parameter in java control panel but not working. Edit: We use jeety server for deployment.

Either System.setProperty or use the -Dname=value flag when you start the JVM

Yes:

public static void main(String args[]) {     String key = "a new property";     System.setProperty(key, "a property with a value");     System.out.println(System.getProperty(key)); }