英文:
Queue method problem white problem is it will delete the data?
问题
在程序中添加这段代码时，出现了问题。
while (true) {
boolean h1Status = false, h2Status = false, h3Status = false;
if (h1.isEmpty() == false) {
if (h1.last() == LastBuffer + 1) {
LastBuffer++;
System.out.println("将包裹 " + LastBuffer + " 从输入缓冲区移到输出缓冲区");
h1Status = true;
}
} else if (h2.isEmpty() == false) {
if (h2.last() == LastBuffer + 1) {
LastBuffer++;
System.out.println("将包裹 " + LastBuffer + " 从输入缓冲区移到输出缓冲区");
h2Status = true;
}
} else if (h3.isEmpty() == false) {
if (h3.last() == LastBuffer + 1) {
LastBuffer++;
System.out.println("将包裹 " + LastBuffer + " 从输入缓冲区移到输出缓冲区");
h3Status = true;
}
} else if (h1Status == false && h2Status == false && h3Status == false) {
break;
}
}
错误信息为：
Exception in thread "main" EmptyListException: 链表为空。
at LinkedList.removeFromTail(LinkedList.java:54)
at LinkedQueue.HeadCheck(LinkedQueue.java:56)
at ParcelQueues.main(ParcelQueues.java:124)
我在队列中添加了两个方法：
public int last()
{
Object item = qll.removeFromHead();
int i = (int)item;
return i;
}
public int HeadCheck()
{
Object item = qll.removeFromTail();
int i = (int)item;
qll.addToTail(item);
return i;
}
你如何解决这个问题？我解决了大约3小时。这就像是一个包裹的配送安排。当一个包裹输出到缓冲区时，它需要检查所有的队列（h1、h2、h3）是否可以输出到缓冲区。最终的输出应该是（1 2 3 4 5 6 7）。
英文:
When i add this in the program,it has a problem.
while (true) {
boolean h1Status = false, h2Status = false, h3Status = false;
if (h1.isEmpty() == false) {
if (h1.last() == LastBuffer + 1) {
LastBuffer++;
System.out.println("Move parcel " + LastBuffer + " from input buffer to output buffer directly");
h1Status = true;
}
} else if (h2.isEmpty() == false) {
if (h2.last() == LastBuffer + 1) {
LastBuffer++;
System.out.println("Move parcel " + LastBuffer + " from input buffer to output buffer directly");
h2Status = true;
}
} else if (h3.isEmpty() == false) {
if (h3.last() == LastBuffer + 1) {
LastBuffer++;
System.out.println("Move parcel " + LastBuffer + " from input buffer to output buffer directly");
h3Status = true;
}
} else if (h1Status == false && h2Status == false && h3Status == false) {
break;
}
}
and the error
Exception in thread "main" EmptyListException: List is empty.
at LinkedList.removeFromTail(LinkedList.java:54)
at LinkedQueue.HeadCheck(LinkedQueue.java:56)
at ParcelQueues.main(ParcelQueues.java:124)
I added two of the method in queue
public int last()
{
Object item=qll.removeFromHead();
int i=(int)item;
return i;
}
another:
public int HeadCheck()
{
Object item=qll.removeFromTail();
int i=(int)item;
qll.addToTail(item);
return i;
}
how can I solve the problem?I solved it around 3 hours.It like a Parcel arrangement for delivery.When 1 output to the buffer.It needs to check all of the queue(h1,h2,h3)to the buffer.The Finally output is (1 2 3 4 5 6 7)
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