如何通过反射得到一个类型的所有常量？

public class Test {
    public static void main(String[] args) throws Exception {
        Class<?> clazz = MyClass.class;
        Field[] fields = clazz.getFields();
        for (Field field : fields) {
            String name = field.getName();
            Class<?> type = field.getType();
            String className = type.getName();
            String constantName = className.replace("java.lang.", "");
            Field.set(clazz, field, Field.get(clazz) + constantName);
        }
    }
}

class MyClass {
    public static final String MY_CONSTANT = "My Constant";
}