Java System setProperty() Method

The setProperty() method of Java system class sets the property of the system which is indicated by a key.

Syntax:

Parameters:

key - It is the name of the system property.

value - It is the value of the system property.

Returns

This method returns the System property's previous value. If System Property does not have any previous value, this method returns null.

Exceptions

SecurityException is thrown if security manager exists and its checkPermission method doesn't allow setting of the specified property.
NullPointerException is thrown key or value is null.
IllegalArgumentException is thrown if the key is empty.

Example

import java.io.FileNotFoundException;
import java.util.Properties;

public class SystemSetPropertyExample {

	public static void main(String[] args) throws FileNotFoundException {
		Properties p=new Properties();
		p.setProperty("name","Shubham Jadon" );
		System.out.println("Pervious property : "+p);
		p.setProperty("name", "Jadon Shubham");
		System.out.println("New property : "+p);
	}
}

Test it Now

Output:

Pervious property : {name=Shubham Jadon}
New property : {name=Jadon Shubham}

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Java System Class