Java System clearProperty() Method

The clearProperty() method of Java System class removes the system property indicated by the specified key.

Syntax

Parameters

Key - Removes the name of System property

Returns

The previous string value of the system property.
If there was no property with that key then it will return null.
If Key is null then a NullPointerException is thrown.
If key is empty then an IllegalArgumentException is thrown.

Example 1

public class SystemClearPropertyExample1 {
	public static void main(String[] args) {
		//defaut property 
		System.out.println("Before using clearproperty = "+System.getProperty("java.class.path")); 
        String a=System.clearProperty("java.class.path");//using clearproperty
        System.out.println("After using clearproperty = "+System.getProperty("java.class.path"));
}
}

Test it Now

Output:

Before using clearproperty = E:\Practicecorejava\FirstThisDemo\bin;E:\mysql jar file\com.mysql.jdbc_5.1.5.jar
After using clearproperty = null

Example 2

public class SystemClearPropertyExample2 {
	public static void main(String[] args) {
		//getting property
		System.out.println("Default Property = "+System.getProperty("user.dir"));
		//clearing property
        String a=System.clearProperty("user.dir");
        //setting property
        System.setProperty("user.dir", "JavaTpoint");
        System.out.println("New Property = "+System.getProperty("user.dir"));
}
}

Test it Now

Output:

Default Property = E:\Practicecorejava\FirstThisDemo
New Property = JavaTpoint

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Java System Class