# Code
public class App { public static void main(String[] args) { Depot depot = new Depot(100); Producer producer = new Producer(depot); Consumer consumer = new Consumer(depot); producer.produce(60); consumer.consume(100); producer.produce(90); consumer.consume(40); } } class Depot { // 仓库最大容量 private int capacity; // 仓库目前容量 private int size; public Depot(int capacity) { this.size = 0; this.capacity = capacity; } public synchronized void produce(int val) { try { int surplus = val; while (surplus > 0) { while (size >= capacity) { wait(); } int incre = (size + surplus) > capacity ? (capacity - size) : surplus; size += incre; surplus -= incre; System.out.printf("%s plan to produce (%d), actually produce (%d), depot size (%d) \n", Thread.currentThread().getName(), val, incre, size); notify(); } } catch (InterruptedException e) { e.printStackTrace(); } } public synchronized void consume(int val) { try { int surplus = val; while (surplus > 0) { while (size <= 0) { wait(); } int desc = (size < surplus) ? size : surplus; size -= desc; surplus -= desc; System.out.printf("%s plan to consume (%d), actutally consume (%d), depot size (%d) \n", Thread.currentThread().getName(), val, desc, size); notify(); } } catch (InterruptedException e) { e.printStackTrace(); } } } class Producer { private Depot depot; public Producer(Depot depot) { this.depot = depot; } public void produce(final int val) { new Thread() { public void run() { depot.produce(val); } }.start(); } } class Consumer { private Depot depot; public Consumer(Depot depot) { this.depot = depot; } public void consume(final int val) { new Thread() { public void run() { depot.consume(val); } }.start(); } }
# Output:
Thread-0 plan to produce (60), actually produce (60), depot size (60)
Thread-3 plan to consume (40), actutally consume (40), depot size (20)
Thread-2 plan to produce (90), actually produce (80), depot size (100)
Thread-1 plan to consume (100), actutally consume (100), depot size (0)
Thread-2 plan to produce (90), actually produce (10), depot size (10)