Add 4 1

src/part4/aufg1/Demo.java

@@ -0,0 +1,12 @@
+package part4.aufg1;
+
+public class Demo {
+    public static void main(String[] args) {
+        ThreadedCounter tc = new ThreadedCounter(-1,1);
+        ThreadedCounter tC = new ThreadedCounter(4,2);
+
+        tc.start();
+        tC.start();
+
+    }
+}

src/part4/aufg1/ThreadedCounter.java

@@ -0,0 +1,30 @@
+package part4.aufg1;
+
+public class ThreadedCounter extends Thread {
+    private final int threadNumber;
+    private final int increment;
+    static int sharedInt = 0;
+    static int iterations = 0;
+
+    public ThreadedCounter(int increment, int threadNumber) {
+        this.increment = increment;
+        this.threadNumber = threadNumber;
+    }
+
+    public void run() {
+        while (sharedInt < 1000){
+            synchronized (getClass()) {
+                iterations++;
+                sharedInt += increment;
+                System.out.println("Thread " + threadNumber + " made the shared Int: " + sharedInt);
+
+                try {
+                    sleep(10);
+                } catch (InterruptedException e) {
+                    throw new RuntimeException(e);
+                }
+            }
+        }
+        System.out.println("it took " + iterations + " iterations");
+    }
+}