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In Java, you can use the RandomAccessFile class in combination with FileChannel to lock a file before writing. Here is an example that uses FileLock from NIO API (classes in java.nio.* package) to lock a file before writing data and then release the lock once write operation is ...
Now that we understand that we can use FileChannel'stryLock()method andFileLockinterface to lock a file before writing, let's see the program in action. This will help you to understand the concept better. importjava.io.RandomAccessFile;importjava.nio.channels.FileChannel;importjava.nio.channels...
How to use wait() and notify()We've mentioned that the Java wait/notify mechanism is essentially a way to communicate between threads. In a nutshell, the idea is as follows: one or more threads sits waiting for a signal; another thread comes along and notifies the waiting threads (i....
Thesynchronized()function is not only limited to the implicit monitor locks but can also use any other locks such as theReentrantLock, and we only need to pass the lock as the argument of this method. Run this code and ensure the output is as shown below. ...
2.4 How to output thread stack The kill -3 pid command can only print the stack information of the java process at that moment. It is suitable for use in abnormal situations such as slow server response, rapid cpu and memory surge, etc. It can easily locate the java class that caused ...
"Object is currently in use elsewhere" error for picturebox "Parameter is not valid" - new Bitmap() "Recursive write lock acquisitions not allowed in this mode.? "Settings" in DLL project properties and app.config file "The function evaluation requires all threads to run" while accessing mus...
1. Simulating a Deadlock In Java, adeadlock is a situation where a minimum of two threads are holding the lock on some different resource, and both are waiting for the other’s resource to complete its task. And, none is able to leave the lock on the resource it is holding. ...
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Below is sample Java code showing how to lock a PDF document when applying a digital signature to it using jPDFSecure, Qoppa’s Java PDF Security SDK. // load PDF document into jPDFSecure PDFSecure pdf = new PDFSecure("c:/test/test01.pdf", null); // add a signature field Signature...