To access either the current value of a system wide variable or a user variable in Java, see below: String javaHome = System.getenv("JAVA_HOME"); For more information on environment variables see this wikipedia page .

Aug 14, 2011 · To get a specific system property you can use System.getProperty(String key) or System.getProperty(String key, String def). Environment variables are set in the OS, e.g. in Linux export HOME=/Users/myusername or on Windows SET WINDIR=C:\Windows etc, and, unlike properties, may not be set at runtime.

May 11, 2024 · System.getProperty() deals with JVM-specific properties, while System.getenv() allows us to access environment variables at the operating system level. Understanding when to use each method can help us write more flexible, reliable, and …

Oct 24, 2023 · In Java, there are two ways to access the environment variable: 1. System.getEnv () The getEnv () function provides access to all environment variables within a Java program, however it may generate platform dependency if the program is dependent on a specific environment variable.

Nov 8, 2019 · How to get the value of Environment variables? The System class in Java provides a method named System.getenv() which can be used to get the value of an environment variable set in the current system. Syntax: public static String getenv(String key); where key is the Environment variable whose values we want

Oct 26, 2015 · In Java, we can use System.getenv() to access the current system environment variable.

Sep 15, 2011 · System.out.format("%s=%s%n", envName, env.get(envName)); System.getenv() will return a Map<String,String> with all of the environment variables. But you could just as easily switch to ProcessBuilder which is a more convenient API to start new processes.

May 17, 2020 · A quick programmatic guide to read or get environment variable values in java. Java API has System class with getEnv(String key) and getEnv() methods to system env variables.

Jan 5, 2025 · Let’s see how to get environment variables in java. Java provides us with 2 ways to get environment variables in the Java program. System.getenv() System.getProperty() Now let’s see both of them in detail one by one. System.getenv() The System.getenv() method is used to fetch all the environment variables but if a specific key name is ...

Aug 5, 2021 · There are two ways to get the environment variable in Java, by using System properties or by using System.getEnv ().