Converting long to byte in Java

I can't understand the following:

In Java,

long l = 130L;  
byte b = (byte)l;

If I print the value of B, why do I get - 126? What does the long l stand for?

Solution

Bytes are signed in Java - so the range of values is - 128 to 127 inclusive

130 as long bit mode, when simply truncated to 8 bits, it is - 126 bit mode as byte

Another example:

int x = 255;
byte b = (byte) x; // b is Now -1