For shift operations on int types, only the five lowest-order bits of the shift amount are used as the shift distance. This means that shift amounts that are not in the range 0 to 31, inclusive, are silently mapped to values in that range. For example, a shift of an int by 32 is equivalent to shifting by 0, i.e., a no-op.

See JLS 15.19, "Shift Operators", for more details.