package com.hkbea.chap5;

import java.util.Arrays;

import java.util.Comparator;

import java.util.List;

import java.util.stream.Collectors;

public class PuttingIntoPractice {

public static void main(String[] args) {

Trader raoul = new Trader("Raoul", "Cambridge");

Trader mario = new Trader("Mario","Milan");

Trader alan = new Trader("Alan","Cambridge");

Trader brian = new Trader("Brian","Cambridge");

List<Transaction> 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)

);

List<Transaction> tr2011 = transactions.stream().filter(t -> t.getYear() == 2011).sorted(Comparator.comparing(Transaction::getValue)).collect(Collectors.toList());

System.out.println(tr2011);

List<String> citys = transactions.stream().map(t -> t.getTrader().getCity()).distinct().collect(Collectors.toList());

System.out.println(citys);

List<Trader> traders = transactions.stream().map(Transaction::getTrader).distinct().filter(t -> "Cambridge".equals(t.getCity())).sorted(Comparator.comparing(Trader::getName)).collect(Collectors.toList());

System.out.println(traders);

String traderStr = transactions.stream().map(t -> t.getTrader().getName()).distinct().sorted().reduce("", String::concat);

System.out.println(traderStr);

System.out.println(transactions.stream().anyMatch(t -> "Milan".equals(t.getTrader().getCity())));

transactions.stream().filter(t -> "Cambridge".equals(t.getTrader().getCity())).mapToInt(Transaction::getValue).forEach(System.out::println);

transactions.stream().mapToInt(Transaction::getValue).reduce(Integer::max).ifPresent(System.out::println);

transactions.stream().reduce((t1, t2) -> t1.getValue() < t2.getValue() ? t1:t2).ifPresent(System.out::println);

}

}

package com.hkbea.chap5;

public class Trader {

private String name;

private String city;

public Trader(String name, String city) {

super();

this.name = name;

this.city = city;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getCity() {

return city;

}

public void setCity(String city) {

this.city = city;

}

@Override

public String toString() {

return "Trader:"+this.name + " in " + this.city;

}

}

package com.hkbea.chap5;

public class Transaction {

private final Trader trader;

private final int year;

private final int value;

public Transaction(Trader trader, int year, int value) {

super();

this.trader = trader;

this.year = year;

this.value = value;

}

public Trader getTrader() {

return trader;

}

public int getYear() {

return year;

}

public int getValue() {

return value;

}

@Override

public String toString() {

return "{" + this.trader + ", " +

"year: "+this.year+", " +

"value:" + this.value +"}";

}

}