added draft threads

.gitignore

@@ -0,0 +1 @@
+/out/

src/Simulation/Entity.java

@@ -0,0 +1,16 @@
+package Simulation;
+
+public class Entity {
+    // survival rate when enemy met
+    public float survivalRate;
+
+    // petition to notify danger when enemy met
+    public float dangerNotifyChance;
+
+    // number of entities born on reproduction
+    public int reproductionCountMin;
+    public int reproductionCountMax;
+
+    public int nutrientsNecessaryForReproduction;
+    public int currentNutrients;
+}

src/Simulation/Main.java

@@ -1,10 +1,56 @@
 package Simulation;
 
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.Random;
+import java.util.concurrent.ThreadLocalRandom;
+import java.util.concurrent.atomic.AtomicReferenceArray;
+
 public class Main {
-    public static void main(String[] args) {
-        System.out.println("Hello world!");
 
-        final Simulation simulation = new Simulation(20, 20);
-        simulation.simulate(50);
+
+    public static void main(String[] args) throws InterruptedException {
+        final Simulation simulation = new Simulation();
+        simulation.setData(20, 20, 10);
+        simulation.simulate(10);
+        simulation.printData();
+
+        // fix seed
+//        final ThreadLocal<Random> random = ThreadLocal.withInitial(Random::new);
+//        random.get().setSeed(50);
+//        final ThreadLocalRandom random = ThreadLocalRandom.current();
+//        random.setSeed(50);
+
+//        final Random random = Utils.random;
+//        random.setSeed(500);
+//        final ArrayList<Integer> objects = new ArrayList<>();
+//        final ArrayList<Thread> threads = new ArrayList<>();
+//
+//        for (int i = 0; i < 10; i++) {
+//            objects.add(i);
+//        }
+//
+//        for (int i = 0; i < 10; i++) {
+//            final ArrayList<Object> clone = new ArrayList<>(objects);
+//
+//            for (Object object : clone) {
+//                final Thread thread = new Thread(() -> {
+//                    final float randomFloat = random.nextFloat();
+//                    if (randomFloat > 0.5f) {
+//                        objects.remove(object);
+//                    }
+//                });
+//                threads.add(thread);
+//                thread.start();
+//            }
+//
+//            for (Thread thread : threads) {
+//                thread.join();
+//            }
+//
+//            Collections.sort(objects);
+//            System.out.println("objects = " + objects);
+//        }
     }
 }