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RSS订阅转载 Java -- Create a new thread
Here is a simple procedure for running a task in a separate thread:1. Place the code for the task into the "run" method of a class that implements the "Runnable" interface. That interface is very simp...
2018-06-29 20:30:12
177
转载 Java -- The Fork-Join Framework
We will discuss a simple example. Suppose we want to count how many elements of an array fulfill a particular property. We cut the array in half, compute the counts of each half, and add them up. To p...
2018-06-29 19:58:02
100
转载 Java -- Callables and Futures
A "Callable" is similar to a "Runnable", but it returns a value. The "Callable" interface is a parameterized type, with a single method "call".public interface Callable<V> { V call() throws ...
2018-06-28 15:17:17
161
转载 Java -- Older Thread-Safe Collections
Any collection class can be made thread safe by means of "synchronization wrapper":List<E> synchArrayList = Collections.synchronizedList(new ArrayList<E>());Map<K, V> synchHashMap =...
2018-06-27 15:52:18
117
转载 Java -- Parallel Array Algorithms
"Arrays.parallelSort" method can sort an array. For example,String contents = new String(Files.readAllBytes(Path.get("alice.txt")), StandardCharsets.UTF_8);String[] words = contents.split("[\\P{L}]+"...
2018-06-27 14:19:48
275
转载 Thread-Safe Collections
The "java.util.concurrent" package supplies efficient implementations for maps, sorted sets, and queues: "ConcurrentHashMap", "ConcurrentSkipListMap", "ConcurrentSkipListSet", and "ConcurrentLinkedQue...
2018-06-24 20:41:29
230
转载 Java -- Concurrent Fields
There is one other situation in which it is safe to access a thread field -- when it is declared "final" . Considerfinal Map<String, Double> accounts = new HashMap<>();Other threads get t...
2018-06-23 16:04:55
171
转载 Java -- Blocking Queues
"BlockQueue<E>" 's common methods :The blocking queue methods fall into three categories that differ by the action they perform when the queue is full or empty. If you use the queue as a thread ...
2018-06-18 19:46:39
127
转载 Java -- Read/Write Locks
The "java.util.concurrent.locks" package defines two lock classes, the "ReentrantLock" and the "ReentrantReadWriteLock". The latter is useful when there are many threads that read from a data structur...
2018-06-17 18:40:48
138
转载 Java -- Lock Testing and Timeouts
A Thread blocks indefinitely when it calls the "lock" method to acquire a lock that is owned by another thread. You can be more cautious about acquiring a lock. The "tryLock" method tries to acquire a...
2018-06-17 18:26:20
112
转载 Java -- Thread-Local Variables
For example, the "SimpleDateFormat" class is not thread safe. Suppose we have a static variable:public static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");If two thread execu...
2018-06-17 17:43:26
146
转载 Thread-Uncaught Exception
A thread is terminated for one of two reasons: It dies a natural death because the "run" method exits normally. It dies abruptly because an uncaught exception terminates the "run" method.The "ru...
2018-06-17 14:14:36
254
转载 Java -- sychronized Keyword
The "Lock" and "Condition" interface give programmers a high degree of control over locking. However, in most situations, you don't need that control -- you can use a mechanism that is built into the ...
2018-06-17 14:09:23
112
转载 Thread -- Lock Objects and Condition Objects
Lock Objects :The basic outline for protecting a code block with a "ReentrantLock" is :myLock.lock(); //a ReentrantLock objecttry { critical section} finally { myLock.unlock(); //make...
2018-06-17 12:10:44
181
转载 Thread - Race Condition
In most practical multithreaded applications, two or more threads need to share access to the same data, Whathappens if two threads have access to the same object and each calls a method that modifies...
2018-06-13 21:51:20
471
转载 Interrupting Thread
You will find lots of published code in which the InterruptedException is squelched at a low level, like this:void mySubTask() { try { sleep(delay); } catch(InterrptedException e) {} ...
2018-06-11 20:24:05
194
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