Get environment variables in Java

Environment variables are an important part of the operating system that interacts with applications. Obtaining or setting environment variables is a technique often used in programming

Set an environment variable debug to true at runtime: java -Ddebug=true YourClass
In Set an environment variable debug to true in the program: System.setProperty( "debug", "true" );
Get an environment variable debug: String debug = System.getProperty( "debug" );

Listed in the table below Some environment variables have been defined by Java and can be obtained through System.getProperty( "key" ) in the program. For more environment variables, please refer to the JDK documentation.

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