Ha ha. China
does not have the AEGIS system. They may have stolen some aspects of it, but the whole system is impossible to steal. The AEGIS program is widely spread throughout the US defense infrastructure.
Some people see China building ships with Phased Array radar and VLS and think...that's an "AEGIS" ship. I got news for you. Theres alot more to AEGIS than that.
The AEGIS is a full spectrum battle-management system capable of prosecuting aircraft, missile, surface, sub-surface, land, and ballistic missile targets simultaneously. It is a fully integrated network that can time-share, and cooperatively engage multiple targets and can use defensive systems passively in a coordinated fashion. The AEGIS sytem can be used in multiple modes including a full-auto mode where the system can maximize its full potential with barely any inputs from operators. The system is totally networked among mutliple surface combatants. And don't even get me started on how many man hours the USN has in experience using these ships. PLAN has zero. And PLAN will not gain any with USN tech AEGIS, because they don't have anything like it. The PLAN "AEGIS" is a cheap off-shoot only. I'm certain they stole some info on it, but to make it work is another question. Then to get crews adequately trained and systems totally field tested is another one. Then comes the experience that the PLAN would take years to get on their copied version. Their system will definitely be less capable than the USN stuff. If all you're doing is copying, it's impossible to reach new capabilities. Meanwhile the USN is moving it's naval engineering beyond AEGIS. But that's a whole other thread.
China has built ships with PAR and VLS and that's about it. But these ships will come nowhere near the capabilities of the USN surface fleet. As I've said before, you can only get so far with pieces of stolen technology. The good news for the US is that China's most capable stuff is absorbed rather than developed indigenously.