Aufgaben Vorlesung 3

Semester2/Vorlesung3.java

@@ -0,0 +1,44 @@
+package Semester2;
+
+import java.lang.Thread;
+
+public class Vorlesung3 extends Thread{
+
+    static int sharedvar = 5;
+
+    boolean updown;
+    int howmuch;
+
+
+    public Vorlesung3(boolean updown, int howmuch, String name) {
+        this.updown = updown;
+        this.howmuch = howmuch;
+        this.setName(name);
+    }
+
+
+    public static void main(String[] args) {
+        Vorlesung3 zaehler1 = new Vorlesung3(true, 1, "Thread1");
+        zaehler1.start();
+        Vorlesung3 zaehler2 = new Vorlesung3(false, 1, "Thread2");
+        zaehler2.start();
+
+    }
+
+
+    public void run() {
+        while (sharedvar != 0) {
+            berechnung(this.updown, this.howmuch);
+            System.out.println(this.getName() + ": " + sharedvar);
+        }
+    }
+
+
+    public static synchronized void berechnung(boolean updown, int howmuch) {
+        if (updown) {
+            sharedvar += howmuch;
+        } else {
+            sharedvar -= howmuch;
+        }
+    }
+}

Semester2/Vorlesung3part2.java

@@ -0,0 +1,74 @@
+package Semester2;
+
+import java.util.LinkedList;
+import java.util.Queue;
+
+public class Vorlesung3part2 extends Thread{
+
+    static Queue<Integer> queue = new LinkedList<>();
+
+    boolean wasBinIch;
+
+    public Vorlesung3part2(boolean wasBinIch, String name) {
+        this.wasBinIch = wasBinIch;
+        this.setName(name);
+    }
+
+    public static void main(String[] args) {
+        Vorlesung3part2 erzeuger1 = new Vorlesung3part2(true, "Hugo");
+        erzeuger1.start();
+        Vorlesung3part2 erzeuger2 = new Vorlesung3part2(true, "Dieter");
+        erzeuger2.start();
+        Vorlesung3part2 erzeuger3 = new Vorlesung3part2(true, "Kai");
+        erzeuger3.start();
+        Vorlesung3part2 verbraucher1 = new Vorlesung3part2(false, "D1");
+        verbraucher1.start();
+        Vorlesung3part2 verbraucher2 = new Vorlesung3part2(false, "D2");
+        verbraucher2.start();
+    }
+
+    public void run() {
+        if (this.wasBinIch) {
+            this.erzeuger();
+        } else {
+            this.verbraucher();
+        }
+    }
+
+    public void erzeuger() {
+        while (true) {
+            try {
+                Thread.sleep((int) (Math.random() * 1000));
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+            synchronized (queue) {
+                queue.add(1);
+                System.out.println(this.getName() + " hat Druckauftrag hinzugefügt");
+                System.out.println(queue + "\n");
+                queue.notify();
+            }
+        }
+    }
+
+    public void verbraucher() {
+        while (true) {
+            synchronized (queue) {
+                while (queue.isEmpty()) {
+                    try {
+                        queue.wait();
+                    } catch (InterruptedException e) {
+                        e.printStackTrace();
+                    }
+                }
+                queue.remove();
+                System.out.println(this.getName() + " hat einen Druckauftrag abgearbeitet");
+            }
+            try {
+                Thread.sleep((int) (Math.random() * 900));
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+}