### Question:
StaticJdkProxyDemo implements UserService { @Override public void addUser(String name) { log.warn("before add user"); userService.addUser(name); log.warn("after add user"); }  @Override void addUser(String name); @Override void removeUser(String name); @Override String getUsername(String name); @Override String getUsernameFromSelf(String name);  }### Answer:
@Test void addUser() { staticJdkProxyDemo.addUser("xiaoming"); }