Test.java

package com.freemindcafe.java8.sample2;

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

import org.junit.Before;

public class Test {
    
    List<Transaction> transactions;
    
    @Before
    public void before(){
        Trader raoul = new Trader("Raoul", "Cambridge");
        Trader mario = new Trader("Mario","Milan");
        Trader alan = new Trader("Alan","Cambridge");
        Trader brian = new Trader("Brian","Cambridge");
        
        transactions = Arrays.asList(
            new Transaction(brian, 2011, 300), 
            new Transaction(raoul, 2012, 1000),
            new Transaction(raoul, 2011, 400),
            new Transaction(mario, 2012, 710),  
            new Transaction(mario, 2012, 700),
            new Transaction(alan, 2012, 950)
        );          
    }
    
    @org.junit.Test
    public void all_the_transactions_in_year_2011_sort_them_by_value(){
        List<Integer> values = transactions.stream().filter(t -> t.getYear() == 2011).map(t -> t.getValue()).sorted((t1,t2)-> t1.compareTo(t2)).collect(Collectors.toList());
        System.out.println(values);
        
        //IntStream intStream = transactions.stream().filter(t -> t.getYear() == 2011).mapToInt(t->t.getValue()).sorted().co
    }
    
    //unique_cities_where_traders_work
    //all_traders_from_cambridgr_sort_by_name
    //string_of_all_trader_names_sorted_alphabetically
    //any_traderes
    

}