bit.ly/java8course

[kredisov]

import jdk.nashorn.internal.ir.TemporarySymbols;

import java.time.*; import java.time.temporal.ChronoUnit; import java.time.temporal.TemporalAdjuster; import java.time.temporal.TemporalAdjusters; import java.time.temporal.TemporalUnit;

/**

• Created by RED14 on 10.08.2016. */ public class Java8DateTime { public static void main(String[] args) throws Exception { System.out.println(LocalDate.now(ZoneId.of("UTC+2")).atTime(LocalTime.now())); System.out.println(Instant.now());

  ZonedDateTime zdt = ZonedDateTime.of(LocalDate.of(2016, Month.MARCH, 1),
        LocalTime.MIN,
        ZoneId.of("Europe/London")
  );
  ZonedDateTime zd2 = ZonedDateTime.of(LocalDate.of(2016, Month.OCTOBER, 1),
        LocalTime.MIN,
        ZoneId.of("Asia/Tokyo")
  );
  
  System.out.println(zdt.plus(2, ChronoUnit.CENTURIES));
  
  System.out.println(ZoneId.of("Europe/London").getRules().getTransitionRules());
  
  System.out.println(Duration.between(zdt, zd2).getSeconds());
  System.out.println(Period.between(zdt.toLocalDate(), zd2.toLocalDate()));
  
  System.out.println(LocalDate.now().with(
        TemporalAdjusters.dayOfWeekInMonth(
                3, DayOfWeek.FRIDAY)
  ));

  } }

[kredisov]

import java.util.concurrent.ForkJoinPool; import java.util.concurrent.RecursiveTask;

/**

• Created by RED14 on 10.08.2016. */ class MyTask extends RecursiveTask {

  private static final int SIZE = 100;

  final String a; final String b;

  public MyTask(String a, String b) { this.a = a; this.b = b; }

  @Override protected String compute() { long ai = Long.valueOf(a); long bi = Long.valueOf(b); if(bi-ai<SIZE) { long sum = 0; for(long i=ai; i< bi; i++) sum += i; return Long.toString(sum); } else { long mid = ai + (bi - ai) / 2; String midStr = Long.toString(mid);

    MyTask task1 = new MyTask(a, midStr);
    MyTask task2 = new MyTask(midStr, b);
  
    task1.fork();
  
    String r2 = task2.compute();
    String r1 = task1.join();
  
    long r1i = Long.valueOf(r1);
    long r2i = Long.valueOf(r2);
  
    return Long.toString(r1i + r2i);
  }

  } }

public class Java8JoinFork {

public static void main(String[] args) {
    ForkJoinPool pool = new ForkJoinPool();

    String r = pool.invoke(new MyTask("1", "1000000000"));
    System.out.println(r);

    pool.shutdown();
}

}