Java lambdaexpression ::Sharing some sample landa express to pull all ids in this cause distinct and separated by commas like ('1','2')

lambdaStrmDistinctSepaByCommas

Sharing some sample landa express to pull all ids in this cause distinct and separated by commas like ('1','2')
In this example a tab(table) object has list of parentId_pkids which is collection of fkids() and under each fkid object there is collection of string 


NOdeleet = NOdeleet + tab.parentId_pkids.fkids().stream()
        .map(fkid -> fkid.Pks.stream()
            .filter(ids -> !ids.deleteable)
            .map(ids -> ids.Pkids.stream()
                .map(Object::toString)
                .collect(Collectors.joining("','"))
                )
        .collect(Collectors.joining("','")))
        .distinct()
        .collect(Collectors.joining("','", "('", "')"))