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
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