Why this is working as its out of range and giving -127 as output?

[Nitya_Somani]

package DataTypes;

public class DemoData {

public static void main(String[] args) 
{
	
	byte b = (byte)129;
	System.out.println(b);
	
	

}

}

[Monu-Singh-480654572341490 (Monu Kumar)]

Hey @Nitya_Somani