A literal integer is always an int, compiler automatically narrows the literal value to a byte : Integer « Java Source And Data Type « SCJP

1. SCJP
2. Java Source And Data Type
3. Integer

public class MainClass{
    public static void main(String[] argv){
        byte b = 27;
        
        //The preceding code is identical to the following:
        
        b = (byte) 27; // Explicitly cast the int literal to a byte

        System.out.println();
    }
}