문제문제해석해결방안 문제List roomProductList = List.of(roomProduct1, roomProduct2, roomProduct3)Exception in thread "main" java.lang.UnsupportedOperationException at java.base/java.util.ImmutableCollections.uoe(ImmutableCollections.java:142) at java.base/java.util.ImmutableCollections$AbstractImmutableList.sort(ImmutableCollections.java:261) at com.chb.chapter3.Problem4.solution(Problem4.java:22) at com.ch..