I suppose it would depend on its defence commitments? If Jalan still has Manchuria as a puppet and an occupied Korea it may well need to have an anti-terrorist focus. Certainly nuclear weapons as a deterrent from NATO and Soviet aggression (perhaps Japan would set up its own Non-Aligned Movement analogue in the Cold War?).
A large navy too, to maintain the empire and counter the Americans; they can't really match the US in numbers, but would they even need to? Will the US even bother projecting as much strength in the Pacific TTL as OTL? It can probably rely on Japan to counter the USSR, and butterflies would remove Korea, Vietnam, and other OTL East Asian conflicts.
In a timeline such as this wouldn't Japan overtime liberalize, and would they still have an economic boom as they did along with being a major producer in electronics, entertainment and culture?
Maybe, but it certainly wouldn't be, as you posited,
By 2010 the empire is like china in OTL .Thay are where most of the worlds iphones and clothes come from
for similar reasons it isn't like that IOTL. China has the big advantage of very cheap labour, Japan doesn't in either OTL or TTL.
Japan would have an unrecognisable culture, certainly no anime or manga as we'd know it; those require the sort of American influence which only comes from occupation. The mindset of the Empire is likely to keep them very insular. As long as it doesn't face too heavy sanctions, the Japanese economy can probably continue growing, and exploiting its colonial empire.