Sorting a list with stream.sorted() in Java

Question

I\'m interested in sorting a list from a stream. This is the code I\'m using:

list.stream()
    .sorted((o1, o2)->o1.getItem().getValue().compareTo(o2.get         


        

Answer 1

Collection> itemCollection = basket.values();
Iterator> itemIterator =   itemCollection.stream().sorted(new TestComparator()).collect(Collectors.toList()).iterator();



package com.ie.util;

import com.ie.item.Item;

import java.util.Comparator;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

public class TestComparator implements Comparator> {

// comparator is used to sort the Items based on the price


    @Override
    public int compare(Map o1, Map o2) {


      //  System.out.println("*** compare method will be called *****");


        Item item1 = null;
        Item item2 = null;


        Set itemSet1 = o1.keySet();
        Iterator itemIterator1 = itemSet1.iterator();
        if(itemIterator1.hasNext()){
           item1 =   itemIterator1.next();
        }

        Set itemSet2 = o2.keySet();
        Iterator itemIterator2 = itemSet2.iterator();
        if(itemIterator2.hasNext()){
            item2 =   itemIterator2.next();
        }


        return -item1.getPrice().compareTo(item2.getPrice());


    }
}

**** this is helpful to sort the nested map objects like Map> here i sorted based on the Item object price .