System.clearProperty(String key) method enables you to remove a system property. The key must not be an empty string or a null value because it will cause the method to throw an IllegalArgumentException or a NullPointerException.
It will also check if a SecurityManager exists and if you don’t have a write permission to the system property a SecurityException is going to be thrown.
package org.kodejava.example.lang;
public class ClearProperty {
public static void main(String[] args) {
String key = "user.dir";
System.out.println(key + " = " + System.getProperty(key));
// The System.clearProperty() method available in Java 1.5
System.clearProperty(key);
System.out.println(key + " = " + System.getProperty(key));
}
}
The code snippet above give us the following output:
user.dir = /Users/wsaryada/kodejava/src/kodejava-project
user.dir = null
Founder at Kode Java Org
I am a programmer, a runner, a recreational diver, currently live in the island of Bali, Indonesia. Mostly programming in Java, Spring Framework, Hibernate / JPA. If these posts help, you can support me, buy me a cup of coffee or tea. Thank you 🥳
Latest posts by Wayan Saryada (see all)
- How do I convert java.util.TimeZone to java.time.ZoneId? - April 25, 2020
- How do I get a list of all TimeZones Ids using Java 8? - April 25, 2020
- How do I get HTTP headers using HttpClient HEAD request? - April 22, 2020