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Showing content from https://www.tutorialspoint.com/java/lang/system_getproperty_string.htm below:

Java System getProperty() Method

The Java System getProperty(String key) method gets the system property indicated by the specified key.

Following is the declaration for java.lang.System.getProperty() method

public static String getProperty(String key)

key − This is the name of the system property.

This method returns the string value of the system property, or null if there is no property with that key.

• SecurityException − if a security manager exists and its checkPropertyAccess method doesn't allow access to the specified system property.

• NullPointerException − if key is null.

• IllegalArgumentException − if key is empty.

The following example shows the usage of java.lang.System.getProperty() method. In this program, we've retrieved and printed the user directory using getProperty() method and passing it "user.dir". In next statement, we've passed non-existent key to check if getProperty() method returns null.

package com.tutorialspoint;

public class SystemDemo {

   public static void main(String[] args) {

      // prints the name of the system property
      System.out.println(System.getProperty("user.dir"));

      // prints null if system property is not present
      System.out.println(System.getProperty("user.name1"));
   }
} 

Let us compile and run the above program, this will produce the following result −

C:\Users\Tutorialspoint\eclipse-workspace\Tutorialspoint
null

The following example shows the usage of java.lang.System.getProperty() method. In this program, we've retrieved and printed the user directory using getProperty() method and passing it "os.name".

package com.tutorialspoint;

public class SystemDemo {

   public static void main(String[] args) {
   
      // prints the name of the Operating System
      System.out.println(System.getProperty("os.name"));
   }
} 

Let us compile and run the above program, this will produce the following result −

Windows 11

The following example shows the usage of java.lang.System.getProperty() method. In this program, we've retrieved and printed the user directory using getProperty() method and passing it "java.runtime.version".

package com.tutorialspoint;

public class SystemDemo {

   public static void main(String[] args) {

      // prints Java Runtime Version
      System.out.println(System.getProperty("java.runtime.version" ));
   }
} 

Let us compile and run the above program, this will produce the following result −

21.0.2+13-LTS-58

java_lang_system.htm

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