download zip of files only
Fri Apr 21 23:07:50 GMT 2023
From /weblog/java/features
Introduction to Java Encryption/Decryption - https://dev.java/learn/security/intro/ Java Serialization Filtering: Prevent 0-day Security Vulnerabilities - https://foojay.io[..]g-prevent-0-day-security-vulnerabilities Using JCE with OpenSSL - http://kasparov.skife.org[..]ive/src/java/jce-openssl-redux.writeback ---------- Forwarded message ---------- From: "cab"
To:
Date: 10 Mar 2005 23:33:16 +0800
Subject: Re: CRC-32
java.util.zip.CRC32 crc32 = new java.util.zip.CRC32();
crc32.update(byteArray);
long crcValue = crc32.getValue();
"Day Chan" 撰寫於郵件新聞:4230a15b$3@newsgroup.com.hk...
> Does anyone know how to calculate CRC-32 in Java?
> Thanks~
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Thu Apr 20 14:05:04 GMT 2023
From /weblog/java/concurrency
An API to get the state of a thread, but someone say it is not reliable - http://java.sun.com[..]5.0/docs/api/java/lang/Thread.State.html http://java.silke-wingens.de/2011/03/13/threads-states/?lang=en http://www.nabble.com[..]readed-programs-tf3627394.html#a10128844 Having said that, I have to note that using Thread#getState() is not something you can absolutely rely on as the behavior isn't guaranteed to be the same on all platforms. That is, it can be a useful tool for debugging and test-driving but not ideal for regression (unit) testing. Overview of Java thread - http://java67.blogspot.hk[..]t-thread-and-javalangthread-in-java.html Loom - https://webtide.com/do-looms-claims-stack-up-part-1/ https://webtide.com/do-looms-claims-stack-up-part-2/ How will we debug Loom applications? - https://www.reddit.com[..]drv/how_will_we_debug_loom_applications/ Question: Why exactly are fibers cheaper than platform threads? - https://www.reddit.com[..]ion_why_exactly_are_fibers_cheaper_than/ Handling Virtual Threads - https://dzone.com/articles/handling-virtual-threads 1. Avoid Synchronized Blocks/Methods 2. Avoid Thread Pools To Limit Resource Access 3. Reduce ThreadLocal Usage https://dzone.com[..]o-avoid-when-switching-to-virtual-thread
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Wed Jul 06 13:31:29 GMT 2022
From /weblog/java/features
Strategies of loading image, select difference API to load image in difference case - http://java.sun.com[..]rticles/Media/imagestrategies/index.html The Perils of Image.getScaledInstance() , with more detail explanation of image handling - http://today.java.net[..]3/perils-of-image-getscaledinstance.html In Part I we talk about the building blocks of metadata in images and how it may matter to you as developer. - https://hillert.com/blog/read-write-image-metadata-java-part-1/
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Sat Mar 19 12:00:19 GMT 2022
From /weblog/java/concurrency
Just know that interrupt() call is just setting a flag, it have to be doing IO work (like database call), or in wait() status, before the thread can really be interrupted. http://blogs.sun.com[..]winger?entry=swingworker_stop_that_train Another nice explanation about interrupt, in summary: What should we do when we call code that may cause an InterruptedException? Don't immediately yank out the batteries! Typically there are two answers to that question: 1) Rethrow the InterruptedException from your method. This is usually the easiest and best approach. It is used by the new java.util.concurrent.* package [ http://java.sun.com[..]util/concurrent/Semaphore.html#acquire() ], which explains why we are now constantly coming into contact with this exception. 2) Catch it, set interrupted status, return. If you are running in a loop that calls code which may cause the exception, you should set the status back to being interrupted. For example: while (!Thread.currentThread().isInterrupted()) {
// do something
try {
TimeUnit.SECONDS.sleep(1000);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
break;
}
}Remember the Law of the Sabotaged Doorbell - don't just ignore interruptions, manage them properly! - http://www.javaspecialists.eu/archive/Issue146.html Another blog explain about InterruptedException - http://www.nurkiewicz.com[..]terruptedexception-and-interrupting.html http://ocpsoft.org[..]running-infinite-java-regular-expression http://praveer09.github.io[..]derstanding-thread-interruption-in-java/ How to Stop a Java Thread Without Using Thread.stop()? - https://4comprehension.com[..]a-java-thread-without-using-thread-stop/
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