kabutz

// From http://www.gsis.gr/gsis/info/gsis_site/Services/Polites/sources.html
// gr.gsis.e7.E7File class
// Apache 2.0 license

  public static boolean afmIsValid(String afm) {
    int sum = 0;

    if (afm.length() != 9)
      return false;
    for (int i = 0; i < 8; i++)

kabutz

import java.util.*;

public class JavaChampionTest {
  public static void main(String... args) {
    Map<JavaChampion, String> urls = new HashMap<>();
    urls.put(new JavaChampion("Jack"), "fasterj.com");
    urls.put(new JavaChampion("Kirk"), "kodewerk.com");
    urls.put(new JavaChampion("Heinz"), "javaspecialists.eu");

    urls.forEach((p,u) -> System.out.println(u)); // Java 8

kabutz

import java.lang.reflect.*;

public class SillyPuzzle {
    public static void main(String... args) {
        prepareForSillyPuzzle();
        show(6 + 4);
        show(9 + 2);
        show(8 + 5);
        show(5 + 2);
        show(9 + 8);

kabutz

import java.io.*;
import java.nio.file.*;
import java.util.*;
import java.util.concurrent.*;  
import java.util.stream.*;

public class LuckyDraw {
    public static void main(String... args) throws IOException {
        List<Entry> list = Files.lines(Paths.get("luckydraw.csv"))
                .map(Entry::new)

kabutz

import java.math.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;

/**
 * Seems to cause livelock in Java 8 ConcurrentHashMap transfer()
 * method and ConcurrentModificationException in Java 9 HashMap.
 */
public class WeirdComputeIfAbsentBehaviour {

kabutz

import java.lang.management.ManagementFactory;
import java.lang.management.ThreadMXBean;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Set;
import java.util.Timer;
import java.util.TimerTask;

kabutz

/* 
  Algorithm is exponential - very bad.  It is just meant to exercise the CPU a bit and
  to see what happens with different languages.  Not representative of real code.
  Interesting that Java beats C, thanks to HotSpot. I expected Swift to be as fast as C
  at least.  I also expected the compiled Swift to be faster than when run as a script.
  A bit disappointed, but more time needed to see where the bottlenecks are.  Plus I 
  need to run some real code for benchmarking.
  
  Update: swiftc -O improved the speed quite a bit to be about the same speed as Java
  

kabutz

/*
 All it takes is the "lazy" keyword in front of the var definition and the object is instantiated when it is first used.  Brilliant.
*/

class MoralFibre {
    init() {
        print("***Creating MoralFibre***")
    }
    func actSociallyResponsibly() -> Int {
        print("supporting local soup kitchen")

kabutz

abstract class Brick {
  public Brick() {
    greet();
  }

  public abstract void greet();
}

public class HardPlace {
  public class Between extends Brick {

kabutz

/**
 * As seen on https://javaspecialists.slack.com/messages/general 
 *
 * This class fails to compile with JDK 1.6, 1.7 and 1.8:
 *
 * class Two extends Observable {	// Nothing special about the choice of Observable here
 *                   ^
 *   symbol: class Observable
 * 1 error
 *