How to use getenv() in Java SE 5.0

Since getenv() method is no more deprecated in Java SE 5.0, we can start using this to get the System Environment variables. This method has two forms:

• getenv() -> returns the Map contains the System Environment. NULL is returned if there are no System Environment varibales.

  Ex: Map sysEnvMap = System.getenv();

• String getenv(String key) -> returns the value of passed environment key. NULL is returned if the key does not exist.

  Ex: String sysEnvStr = System.getenv("JAVA_HOME");

for more details: Java Tips