Complete sync primitives task

java-advanced-ru/sync-primitives/.gitignore

@@ -1,2 +1,4 @@
 .gradle/
 build/
+caches/
+.idea/

java-advanced-ru/sync-primitives/src/main/java/exercise/App.java

@@ -4,7 +4,18 @@ class App {
 
     public static void main(String[] args) {
         // BEGIN
-
+        var list = new SafetyList();
+        var thread1 = new ListThread(list);
+        var thread2 = new ListThread(list);
+        thread1.start();
+        thread2.start();
+        try {
+            thread1.join();
+            thread2.join();
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+        System.out.println(list.getSize());
         // END
     }
 }

java-advanced-ru/sync-primitives/src/main/java/exercise/ListThread.java

@@ -1,5 +1,22 @@
 package exercise;
 
 // BEGIN
+public class ListThread extends Thread {
+    SafetyList list;
+    public ListThread(SafetyList list) {
+        this.list = list;
+    }
 
+    @Override
+    public void run() {
+        for (int i = 0; i < 1000; i++){
+            try {
+                Thread.sleep(1);
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+            list.add((int) (Math.random() * 1000));
+        }
+    }
+}
 // END

java-advanced-ru/sync-primitives/src/main/java/exercise/SafetyList.java

@@ -2,6 +2,25 @@
 
 class SafetyList {
     // BEGIN
-
+    int[] array;
+    int size;
+
+    SafetyList() {
+        array = new int[2100];
+        size = 0;
+    }
+
+    synchronized void add(int number) {
+        array[size] = number;
+        size++;
+    }
+
+    public int get(int index) {
+        return index > size ? 0 : array[index];
+    }
+
+    public int getSize() {
+        return this.size;
+    }
     // END
 }