public?static?void?testProductStream(List<Product>?list)?{
????long?start?=?System.currentTimeMillis();

????Optional?optional?=?list.stream().max((p1,?p2)->?p1.hot?-?p2.hot);
????System.out.println(optional.get());

????long?end?=?System.currentTimeMillis();
????System.out.println("testProductStream:"?+?(end?-?start)?+?"ms");
}

public?static?void?testProductParallelStream(List<Product>?list)?{
????long?start?=?System.currentTimeMillis();

????Optional?optional?=?list.stream().max((p1,?p2)->?p1.hot?-?p2.hot);
????System.out.println(optional.get());

????long?end?=?System.currentTimeMillis();
????System.out.println("testProductParallelStream:"?+?(end?-?start)?+?"ms");
}