Java多线程程序挂起

我有Java中生产者和使用者示例的简单变体。我认为应该可以，但是挂起了。我最初认为这可能是某种形式的死锁，但是当我查看线程转储时，它似乎陷入了无限循环的中间。无论如何，我不明白为什么程序的行为如此奇怪..？

public class ProducerConsumer { 

    public static void main(String[] args) {
        Buffer buffer = new Buffer(7);  
        Producer producer = new Producer(buffer);
        Consumer consumer = new Consumer(buffer);

        producer.start();
        consumer.start();
    }
}

class Buffer{ 
    private char [] buffer;
    private int count = 0, in = 0, out = 0;

    private final Object object1 = new Object(); 

    Buffer(int size){
        buffer = new char[size];
    }

    public void put (char c) {
        while(count == buffer.length) ;

        synchronized(object1) { 
            System.out.println("Producing" + c + "...");
            buffer[in] = c;
            in = (in + 1) % buffer.length;
            count++;    
        }
    }

    public char get() {
        while(count == 0) ;  
        char c = buffer[out];

        synchronized(object1) {
            out = (out + 1) % buffer.length;
            count--;
            System.out.println("Consuming" + c + "...");
            }
        return c;
    }
}

class Producer extends Thread {
    private Buffer buffer;

    Producer(Buffer b){
        buffer = b;
    }

    public void run() {
        for(int i = 0; i < 10; i++) {
            buffer.put((char) ('A' + i%26 ));
        }
    }
}

class Consumer extends Thread {
    private Buffer buffer;

    Consumer(Buffer b){
        buffer = b;
    }

    public void run() {
        for(int i = 0; i < 10; i++) {
            buffer.get();
        }
    }
}

这是程序输出及其线程转储。

c:\Temp\tt>java ProducerConsumer
ProducingA...
ConsumingA...
ProducingB...
ConsumingB...
ProducingC...
ConsumingC...
ProducingD...
ConsumingD...
ProducingE...
ConsumingE...
ProducingF...
ConsumingF...
ProducingG...
ConsumingG...
ProducingH...
ConsumingH...
ProducingI...
ProducingJ...
2019-12-08 22:28:51
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.231-b11 mixed mode):

"DestroyJavaVM" #13 prio=5 os_prio=0 tid=0x0000000002761800 nid=0x3990 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Thread-1" #12 prio=5 os_prio=0 tid=0x000000003a12a800 nid=0x36f0 runnable [0x000000003b04f000]
   java.lang.Thread.State: RUNNABLE
        at Buffer.get(ProducerConsumer.java:36)
        at Consumer.run(ProducerConsumer.java:71)

"Service Thread" #10 daemon prio=9 os_prio=0 tid=0x000000003a0ff000 nid=0x30a4 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C1 CompilerThread3" #9 daemon prio=9 os_prio=2 tid=0x000000003a05a000 nid=0x3890 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread2" #8 daemon prio=9 os_prio=2 tid=0x000000003a057000 nid=0x16a4 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread1" #7 daemon prio=9 os_prio=2 tid=0x000000003a055000 nid=0x4b4 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread0" #6 daemon prio=9 os_prio=2 tid=0x000000003a04d800 nid=0x4160 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Attach Listener" #5 daemon prio=5 os_prio=2 tid=0x0000000039ff9000 nid=0x1028 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" #4 daemon prio=9 os_prio=2 tid=0x0000000039ff7800 nid=0x4f80 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Finalizer" #3 daemon prio=8 os_prio=1 tid=0x0000000039fe1800 nid=0x21c in Object.wait() [0x000000003a5be000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x000000066c408ed8> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144)
        - locked <0x000000066c408ed8> (a java.lang.ref.ReferenceQueue$Lock)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:165)
        at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:216)

"Reference Handler" #2 daemon prio=10 os_prio=2 tid=0x0000000039fe0800 nid=0x4588 in Object.wait() [0x000000003a4bf000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x000000066c406c00> (a java.lang.ref.Reference$Lock)
        at java.lang.Object.wait(Object.java:502)
        at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
        - locked <0x000000066c406c00> (a java.lang.ref.Reference$Lock)
        at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)

"VM Thread" os_prio=2 tid=0x00000000381e9800 nid=0x5418 runnable

"GC task thread#0 (ParallelGC)" os_prio=0 tid=0x0000000002776800 nid=0x2580 runnable

"GC task thread#1 (ParallelGC)" os_prio=0 tid=0x0000000002778000 nid=0x4c98 runnable

"GC task thread#2 (ParallelGC)" os_prio=0 tid=0x000000000277a000 nid=0x560c runnable

"GC task thread#3 (ParallelGC)" os_prio=0 tid=0x000000000277b800 nid=0x3e78 runnable

"GC task thread#4 (ParallelGC)" os_prio=0 tid=0x000000000277d800 nid=0x1f24 runnable

"GC task thread#5 (ParallelGC)" os_prio=0 tid=0x0000000002780000 nid=0x5074 runnable

"GC task thread#6 (ParallelGC)" os_prio=0 tid=0x0000000002783000 nid=0x3d88 runnable

"GC task thread#7 (ParallelGC)" os_prio=0 tid=0x0000000002784000 nid=0x4d18 runnable

"VM Periodic Task Thread" os_prio=2 tid=0x000000003a11c800 nid=0x3f8c waiting on condition

JNI global references: 5

Heap
 PSYoungGen      total 304640K, used 31335K [0x000000066c400000, 0x0000000681800000, 0x00000007c0000000)
  eden space 261120K, 12% used [0x000000066c400000,0x000000066e299c00,0x000000067c300000)
  from space 43520K, 0% used [0x000000067ed80000,0x000000067ed80000,0x0000000681800000)
  to   space 43520K, 0% used [0x000000067c300000,0x000000067c300000,0x000000067ed80000)
 ParOldGen       total 696320K, used 0K [0x00000003c4c00000, 0x00000003ef400000, 0x000000066c400000)
  object space 696320K, 0% used [0x00000003c4c00000,0x00000003c4c00000,0x00000003ef400000)
 Metaspace       used 2642K, capacity 4492K, committed 4864K, reserved 1056768K
  class space    used 283K, capacity 388K, committed 512K, reserved 1048576K

任何提示将不胜感激。