Java System getProperty() Method

The getProperty(String key,Stringdef) method of Java System class returns property of a system which is indicated by a specified key.

Syntax

Parameter

key - the name of the system property.

def - a default value.

Returns

This method returns System property or default value if there is no property with that key.

Exception

If key is null, a NullPointerException is thrown.
If key is empty, aIllegarArgumentException is thrown.
If Secutity manager exist and its CheckProperty method doesn't allow access to the specified system property, a SecurityException is thrown.

Example 1

import java.util.Properties;
public class SystemGetPropertyExample1{
	public static void main(String[] args) {
		//here we created property with my name and assigned its default value ShubhamJadon		
		System.out.println("my name : "+System.getProperty("myname", "Shubham Jadon"));
	}
}

Test it Now

Output:

my name : Shubham Jadon

Example 2

public class SystemGetPropertyExample2 {
	public static void main(String[] args) {
		//here we created property with my name and didn't assigned its default value		
		System.out.println("my name : "+System.getProperty("myname"));
	}
}

Test it Now

Output:

my name : null

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Java System Class