Main.java Source code

Introduction

Here is the source code for Main.java

Source

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

public class Main {
    public static void main(String... args) {
        Student raoul = new Student("Raoul", "Cambridge");
        Student mario = new Student("Mario", "Milan");
        Student alan = new Student("Alan", "Cambridge");
        Student brian = new Student("Brian", "Cambridge");

        List<Graduate> transactions = Arrays.asList(new Graduate(brian, 2011, 300), new Graduate(raoul, 2012, 1000),
                new Graduate(raoul, 2011, 400), new Graduate(mario, 2012, 710), new Graduate(mario, 2012, 700),
                new Graduate(alan, 2012, 950));

        // Get all students from Cambridge and sort them by name.

        List<Student> traders = transactions.stream().map(Graduate::getTrader)
                .filter(trader -> trader.getCity().equals("Cambridge")).distinct()
                .sorted(Comparator.comparing(Student::getName)).collect(Collectors.toList());
        System.out.println(traders);

    }
}

class Student {

    private String name;
    private String city;

    public Student(String n, String c) {
        this.name = n;
        this.city = c;
    }

    public String getName() {
        return this.name;
    }

    public String getCity() {
        return this.city;
    }

    public void setCity(String newCity) {
        this.city = newCity;
    }

    public String toString() {
        return "Student:" + this.name + " in " + this.city;
    }
}

class Graduate {

    private Student trader;
    private int year;
    private int value;

    public Graduate(Student trader, int year, int value) {
        this.trader = trader;
        this.year = year;
        this.value = value;
    }

    public Student getTrader() {
        return this.trader;
    }

    public int getYear() {
        return this.year;
    }

    public int getValue() {
        return this.value;
    }

    public String toString() {
        return "{" + this.trader + ", " + "year: " + this.year + ", " + "value:" + this.value + "}";
    }
}