java - How to compare two Lists of objetcs for difference in objects fields? -


collegues, have 2 lists of different objects.

list<sharesentity> mainsystemsecurities; list<secureentity> supportsystemsecurities;

objects sharesentity , secureentity have 1 same fiels isin. in case isins same in object of theese collections, in cases there different isins in supportsystemsecurities , mainsystemsecurities collection's objects.

i need understand objects (better tell isins) supportsystemsecurities list absence in mainsystemsecurities.

how it? better way compare 2 collection (to compare filedls of collection's objects)?

build map<isintype, sharesentity> first list:

map<isintype, sharesentity> sharesentitymap =     mainsystemsecurities.stream().collect(         collectors.tomap(sharesentity::getisin,                          functions.identity()));

then can iterate other list, looking entities first list in map:

for (secureentity secureentity : supportsystemsecurities) {   sharesentity correspondingsharesentity = sharesentitymap.get(secureentity.getisin());   // ... }

this assumes there single item per isin in first list. if that's not case, can build map<isintype, list<sharesentity>> instead, , proceed (or use multimap).


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