System.getProperty() in Java

The getProperty(String key) method in Java is used to returns the system property denoted by the specified key passed as its argument.It is a method of the java.lang.System Class.

Declaration − The java.lang.System.getProperty(String key) is declared as follows −

public static String getProperty(String key)

where key is the name of the System property.

Some values of the key are as follows −

• file.separator
• java.specification.version
• java.vm.version
• java.class.path
• java.vendor
• java.class.version
• os.arch
• java.compiler
• line.separator
• java.version
• java.vendor.url
• os.name

Let us see a program showing the use of getProperty() method in Java −

Example

 Live Demo

public class Example {
   public static void main(String[] args) {
      System.out.println("System property: " + System.getProperty("user.dir"));
      System.out.println("Operating System: " + System.getProperty("os.name"));
      System.out.println("Java runtime version: " + System.getProperty("java.runtime.version" ));
   }
}

Output

System property: /home/cg/root/5182567
Operating System: Linux
Java runtime version: 1.8.0_141-b16