static String jni_signature(Class c) {
if (c == int.class) return "I";
if (c == long.class) return "J";
if (c == short.class) return "S";
if (c == byte.class) return "B";
if (c == boolean.class) return "Z";
if (c == double.class) return "D";
if (c == float.class) return "F";
if (c == char.class) return "C";
if (c == void.class) return "V";
if (c.isArray()) return "[" + jni_signature(c.getComponentType());
return "L" + name(c) + ";";
}
