p = re.compile(r'(\[*)([ZBCSIJFDV]|L([^;\s]+);)')
prims = {'Z': 'boolean', 'B': 'byte', 'C': 'char', 'S': 'short', 'I': 'int', 'J': 'long', 'F': 'float', 'D': 'double', 'V': 'void'}
def tr(s):
    return [(i.group(3).replace('/', '.') if i.group(3) else prims[i.group(2)]) + ('[]' * len(i.group(1)))
        for i in p.finditer(s)]

# Example:
>>> tr('')
[]
>>> tr('Z')
['boolean']
>>> tr('V')
['void']
>>> tr('FIS')
['float', 'int', 'short']
>>> tr('Ljava/lang/String;I[[SJ')
['java.lang.String', 'int', 'short[][]', 'long']
>>> tr('[V')  # notice that this is actually invalid
['void[]']