Added Java lab programs

ProducerConsumerDemo.java

@@ -0,0 +1,97 @@
+// -------- Shared Buffer Class --------
+class Buffer {
+
+    private int value;
+    private boolean hasValue = false;
+
+    // Producer puts value
+    synchronized void put(int value) {
+        while (hasValue) {
+            try {
+                wait(); // wait if buffer is full
+            } catch (InterruptedException e) {
+                System.out.println(e);
+            }
+        }
+
+        this.value = value;
+        hasValue = true;
+        System.out.println("Produced: " + value);
+
+        notify(); // notify consumer
+    }
+
+    // Consumer gets value
+    synchronized int get() {
+        while (!hasValue) {
+            try {
+                wait(); // wait if buffer is empty
+            } catch (InterruptedException e) {
+                System.out.println(e);
+            }
+        }
+
+        System.out.println("Consumed: " + value);
+        hasValue = false;
+
+        notify(); // notify producer
+        return value;
+    }
+}
+
+// -------- Producer Thread --------
+class Producer extends Thread {
+
+    Buffer buffer;
+
+    Producer(Buffer buffer) {
+        this.buffer = buffer;
+    }
+
+    public void run() {
+        int i = 1;
+        while (true) {
+            buffer.put(i++);
+            try {
+                Thread.sleep(500);
+            } catch (InterruptedException e) {
+                System.out.println(e);
+            }
+        }
+    }
+}
+
+// -------- Consumer Thread --------
+class Consumer extends Thread {
+
+    Buffer buffer;
+
+    Consumer(Buffer buffer) {
+        this.buffer = buffer;
+    }
+
+    public void run() {
+        while (true) {
+            buffer.get();
+            try {
+                Thread.sleep(500);
+            } catch (InterruptedException e) {
+                System.out.println(e);
+            }
+        }
+    }
+}
+
+// -------- Main Class --------
+public class ProducerConsumerDemo {
+
+    public static void main(String[] args) {
+        Buffer buffer = new Buffer();
+
+        Producer producer = new Producer(buffer);
+        Consumer consumer = new Consumer(buffer);
+
+        producer.start();
+        consumer.start();
+    }
+}