point of sale and inventory system source code in java
point of sale and inventory system source code in java
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Java HashMap source code parsing 1
HashMap
First, let's look at how the API documentation describes:
Implementation of the Map interface based on the hash table. This implementation provides all optional ing operations and allows the use of null values and null keys. (The HashMap class is roughly the same as that of Hashtable except for non-synchronous and
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array chain and also encapsulates a layer, A CURRENTHASHMAP has multiple shards, each of which corresponds to an array of linked lists, with multiple threads of concurrency control over the operation of the same shard, in effect, a lock (reentrant lock) on each shard, compared to the concurrency control of Hashtable. The structure for multiple threads to access different fragments, do not wait for each other, thereby reducing the granularity of the lock, improve efficiency. treemap stores data
Java. util. concurrent package source code reading 17 semaphores Semaphore and semaphores semaphore
Anyone who has learned about the operating system knows the Semaphore. In the java. util. concurrent package, there is also a Semaphore implementation: Semaphore.
From the per
methods. You only need to operate on one end of the double-stranded table.
Because this class also implements the Conable interface, the clone () method is implemented, but this method only implements the shortest clone. The source code is as follows:
Private region list
SuperClone () {try {return (writable list
) Super. clone ();} catch (CloneNotSupportedException e) {throw new InternalError
buffer", which wakes the waiting thread on Notfull when the buffer data is read.(02) In the main function of ConditionTest2, 10 "Write Threads" are started, the data is written to Boundedbuffer continuously (0-9), and 10 "read Threads" are started, and the data is read continuously from Boundedbuffer.(03) Simple analysis of the results of the operation. 1, the P1 thread writes 1 to the buffer. at this point, the buffer data: | 1 | | | | | 2, the P4 thread writes 4 to the buffer.
Java BlockingQueue source code analysis, javablockingqueueIntroduction
BlockingQueue is a multi-thread security blocking queue provided by Java concurrent. Its sub-classes include javasblockingqueue and ArrayBlockingQueue.Key APIs
When it comes to queues, the insertion and deletion operations at the beginning and end a
Java. util. concurrent package source code reading 23 Fork/Join framework Fork tip, forkjoin
The previous article has been tracking the pushTask method of ForkJoinWorkerThread, and there is still no way to explain the Fork principle. Let's take a look at the run method of ForkJoinWorkerThread:
Public void run () {Throwable exception = null; try {// initialize the
Java. util. concurrent package source code reading 08 CopyOnWriteArrayList and CopyOnWriteArraySet, copyonwrite
CopyOnWriteArrayList and CopyOnWriteArraySet are similar in terms of data structure types. They all use arrays to save the data structure of a group of data. The difference is simply the difference between List and set. So here we will first discuss Cop
[Java concurrent programming] 18. PriorityBlockingQueue source code analysis,
PriorityBlockingQueue is an array-based thread-safe unbounded queue. Its principle and internal structure are basically the same as those of PriorityQueue, but there are multiple threads for security. 1: theoretically, it is unbounded, So adding an element may cause outofmemoryerror; 2.
the next Watchkey and returns null immediately if no watchkey occurs.Poll (long timeout, timeunit unit): Try to wait for timeout time to get the next watchkey.Take (): Gets the next watchkey if no watchkey occurs on the transplant wait.If the program needs to be monitored all the time, select the Take () method. If the program needs to listen for a specified time, use the poll () method.
Accessing file properties
Public classattributeviewtest { Public Static void Main(string[] ar
Java. util. concurrent package source code reading 11 ThreadPoolExecutor, threadpoolexecutor
First, let's look at the execute method of ThreadPoolExecutor. This method can reflect what happened after a Task is added to the thread pool:
Public void execute (Runnable command) {if (command = null) throw new NullPointerException ();/* if the number of running worker
Collection Interface Collection Interface1. In the collections system, the interface Collection is the root interface2. Refers to a set of objects that are called Collection elements.3. There are some Collection that allow repeating elements, such as List. Others are not allowed, such as Set4. Some elements of implementation are ordered, others are unordered.5. Two "standard" constructors availableA. Non-parametric constructorsB. A constructor with on
Compared with Java Virtual Machine? Directly run Python code without the need for the operating system
Josh Triplett started his speech on PyCon 2015 with a "Smile": porting Python to free him from operating the system: he and his Intel colleagues asked the interpreter to run on the GRUB boot program, BIOS, or EFI
Compared with Java Virtual Machine? Directly run Python code without the need for the operating system
Josh Triplett started his speech on PyCon 2015 with a "Smile": porting Python to free him from operating the system: he and his Intel colleagues asked the interpreter to run on the GRUB boot program, BIOS, or EFI
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