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A multithreaded Java program, until all threads have finished executing, the entire program will not exit. (Note that all non-background threads (Non-daemon thread) are executed, and if a thread executes the System.exit () method, the program exits. Sometimes, you want to abort a thread's execution, such as if you want to quit the program, or you want to cancel a task that is being performed.
Http://www.tuicool.com/articles/m2muui The original http://2014.54chen.com/blog/2014/04/17/how-to-use-akka-in-java-3/ An example is also a classic example of Typesafe. Examples of services provided are the transmission of text. When the text is sent to the frontend node, it delegates the backend node, backend performs the transformation
A simple example of Java-Fork/Join Content: explanation on the Internet: Step 1: Split the task. First, we need a fork class to split large tasks into subtasks. It is possible that the subtasks are still large, so we still need to keep splitting until the subtasks are small enough. Step 2: Execute the task and merge t
1. Creation of objectsThe first virtual opportunity to a new instruction is to check whether the parameter of the directive can be positioned in the constant pool for the symbolic reference of a class, and to check whether the class represented by the symbol reference has been loaded, parsed, and initialized. If not, you must first perform the appropriate class loading process.After the class load check passes, the virtual machine then allocates memory for the new object. The size of the memory
Java has a special thread, the daemon thread, which is particularly low in priority and executes only if other threads in the same program do not execute. Because the daemon has these attributes, it is generally used to provide services for ordinary threads (also known as user threads) in the program. They typically have an infinite loop, or are used to wait for a request service, or to perform a task. The
Beginning with Java 1.5, it provides a thread pool for everyone to use. The function is quite complete. The following is a simple example. Complex examples will be put in the following blogs. Import java. util. List;Import java. util. concurrent. ExecutorService;Import java.
serverBufferedReader br =NewBufferedReader (NewInputStreamReader (Socket.getinputstream ())); String msg=NULL; while(msg = Br.readline ())! =NULL) System. out. println (msg); } Catch(IOException e) {e.printstacktrace (); } } }; }}Package Org.merit.test.socket;import java.io.ioexception;import java.net.serversocket;import java.net.Socket; Import Java.util.concurrent.executorservice;import java.util.concurrent.Executors; Public classMultithreadserver {Private intPort =8821;
can see that all the threads we create are executing concurrently. Copy Code code as follows: Thread-3:3 * 5 = 15 Thread-0:0 * 2 = 0 Thread-3:3 * 6 = 18 Thread-1:1 * 6 = 6 Thread-1:1 * 7 = 7 Thread-3:3 * 7 = 21 Thread-3:3 * 8 = 24 Thread-0:0 * 3 = 0 Thread-0:0 * 4 = 0 Thread-3:3 * 9 = 27 THREAD-1:1 * 8 = 8 All Java programs execute at least one thread. When we run a Jav
Java 1.5 starts, provides the thread pool for everybody to use, the function is quite complete. The following is a simple example. The complex example will be placed in a few blogs later. Import java.util.List; Import Java.util.concurrent.ExecutorService; Import java.util.concurrent.Executors; Import Java.util.concurrent.TimeUnit; /** * Fixed size thread pool *
to ensure that the log service would eventually shut down before the JVM stopped, even if the caller did not call the Stop method to halt the log service;Here's a quick introduction to closing the hooks:Closing a hook is a thread that is registered through the Runtime.addshutdown method but does not start the task immediately, and the JVM starts execution of the closed hook thread that has already been registered during the shutdown process. Closing
, and found that after the first second transfer, the total number was wrong, and the results were carefully observed, due to the parallel execution of the task, and the middle due to the CPU allocation execution order, so we see the results are not exactly the way we implemented the outputAs a result of this problem, we introduce the concept of "lock", because this is an analysis, not for the lock details, the following we in the bank of the transfer
Package org.rui.thread.block;/** * Blocked by mutex as seen in Interrupting.java, if you try to invoke its synchronized method on an object, the lock of this object has been obtained by other tasks, Then the calling task will be suspended (blocked) until the lock is available. * The following example illustrates how the same mutex can be obtained multiple times by the same
true and the other is false.Only this situation occurs when multiple tasks do not matter, because you perform either True or FALSE, only in both cases.The resource encapsulated in my thread task is a Boolean variable, although this variable has a separate copy of the two task objects, but the obtained value can only be two, either true or false. If this is not flag, but Num,int num=100, then it will be dis
Unfortunately, there is not much that can be done automatically when you print. Instead, we have to go through a lot of mechanical, non-OO (object-oriented) steps to finish printing. But when printing a graphical component, it may be somewhat automated: By default, the print () method calls Paint () to do its job. Most of the time this is enough, but if you want to do something special, you have to know the geometry of the page. The following example
Java garbage collection optimization compared with other performance optimization activities, you must first ensure that you understand the entire application and the expected results, rather than simply meeting a certain part of the optimization of the application. Generally, it is easier to follow the following process:Define your own performance goals.Test.Measurement optimization result.Compare with the target.Change the method and test again.Perf
follows: Copy Code code as follows: FileSearch FileSearch = new FileSearch ("c:\\", "Autoexec.bat"); Thread thread = new Thread (FileSearch); Thread.Start (); 8. Wait 10 seconds, then disconnect the thread. The code is as follows: Copy Code code as follows: try { TimeUnit.SECONDS.sleep (10); catch (Interruptedexception e) { E.printstacktrace (); } Thread.Interrupt (); 9. Follow the example
implementation of CONCURRENTHASHMAP, the resources can be segmented processing, you can skillfully avoid multi-threaded resource requisition, so you can divide the list into different segments, to different threads to handle, the code is as follows:Package Tool;import Java.util.list;import Java.util.concurrent.brokenbarrierexception;import Java.util.concurrent.cyclicbarrier;import Java.util.concurrent.atomic.atomicinteger;public Class Mutisegmentmutithread{private static Atomicinteger lock = ne
accessed normally, HTTP ://localhost:8080/demo4ssh-security/admin but not accessible:Spring Security Basic configuration is this, compared to the previous several, Spring security such basic configuration is not much use, now who can still use the plaintext password, MD5 encryption in the way of salt is good configuration (I write by email as salt, But for the sake of simplicity, I have no email in the user table of this demo, so I need to pay attention when using MD5. There is a applicationcon
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