I am having real trouble with using stream and sorted to sort my ArrayList and hope someone can help out. The code uses Croatian words, but I don't think that will be a problem for someone who understands what I mean.
This is the ArrayList
ArrayList<Publikacija> listaPublikacija = new ArrayList<>();
listaPublikacija.add(prvaKnjiga);
listaPublikacija.add(drugaKnjiga);
listaPublikacija.add(prviCasopis);
listaPublikacija.add(drugiCasopis);
In my assignment I am supposed to sort these objects above by getCijena() which is double.
This is the best I got and it still doesn't sort it as it should...
listaPublikacija.stream().sorted((s1, s2) -> Double.compare(s1.getCijena(), s2.getCijena()));
Any kind of help or advice appreciated... I already made the sort in different ways, but it is neccessary to sort it via the sorted method in stream...
I'll post the class script below for easier understanding of the question above:
public Publikacija(String nazivKnjige, int godinaIzdanja, int brojStr, VrstaPublikacije vrstaPub, double cijenaPoStr, double cijena){
this.nazivKnjige= nazivKnjige;
this.godinaIzdanja = godinaIzdanja;
this.brojStr = brojStr;
this.vrstaPub = vrstaPub;
this.cijenaPoStr = cijenaPoStr;
if(getClass().equals(Casopis.class)){this.cijena= Casopis.CIJENA_PO_PRIMJERKU;}
else this.cijena = provjeraCijene(cijena(brojStr,vrstaPub,cijenaPoStr).doubleValue());
Below code is used for to sort the your Publikacija object type Arraylist on behalf of "getCijena"
First method reference extracts the identifying key, second provides the compare function.
this worked, ty for the answer
You are not storing the results of the sorted array back to collection or array. Stream operations do not mutate the underlying collection: