public Map
<String, Double
> getCeny
(){
ceny = new HashMap<>();
for(Spolka s : menager.getSpolki()){
Double wartosc
= ceny.
get(s.
getSektor());
if(wartosc== null){
wartosc = 0.0;
}
ceny.put(s.getSektor(), wartosc + s.getOstatnie().getCena());
}
return ceny;
}
into:
public Map
<String, Double
> getCeny
(){
return menager.getSpolki().stream().collect(Collectors.
toMap(s -> s.getSektor(),
s -> Optional.ofNullable(ceny.get(s.getSektor())).orElse(0.0) + s.getOstatnie().getCena()));
}
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