[Optimize]add generics for CacheBuilder #7487
Description
I think some methods of the CacheBuilder need to add the generics.
for example:
// CacheBuilder#builder:51
public static CacheBuilder builder() {
return new CacheBuilder();
}and here:
// CacheBuilder#builder:58
public CacheBuilder expireNanos(long duration, TimeUnit unit) {
checkExpireNanos(duration, unit);
this.expireNanos = unit.toNanos(duration);
return this;
}