เพื่อน ๆ ที่เขียนโปรแกรมด้วย Java หลาย ๆ คนอาจจะยังไม่รู้จักว่า JVM นั้นมันคืออะไร... ทำงานอย่างไร...
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วันนี้แอดจะมาสรุปวิธีการทำงานของ JVM ให้เพื่อน ๆ พอที่จะเห็นภาพกัน หาพร้อมแล้วไปอ่านกันนนน
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🔹 JVM (Java Virtual Machine) - เป็นเอ็นจิ้นที่จัดเตรียมสภาพแวดล้อมเพื่อรันโค้ด Java ซึ่ง JVM มีหน้าที่รับผิดชอบในการแปลง Bytecode เป็นรหัสเฉพาะเครื่อง ซึ่งเจ้า JVM นี้จะสามารถติดตั้งได้บนทุก Platform ไม่ว่าจะเป็น Unix, Linux หรือ Windows
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⚙️ วิธีการทำงานของ JVM แบ่งได้ดังนี้
🌟 Class Loader Subsystem
เป็นส่วนที่ใช้จัดการ Class Loader Subsystem โดยจะอ่านไฟล์ .class และสร้างเป็น Bytecode บันทึกไว้ใน Method Area จากนั้นจะสร้าง Object เพื่อเป็นตัวแทนไฟล์ไว้ใน Heap Memory
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🌟 Runtime Data Area (JVM Memory)
ส่วนนี้จะเป็นการจัดสรรพื้นที่ของ Memory ให้เหมาะสม เพื่อนำไปใช้งานในแต่ละส่วน ได้แก่ Method Area , Heap Area, Stack Area, PC Register, Native Method Stack นั่นเอง
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🌟 Execution Engine
เป็นส่วนที่ใช้ควบคุมกระบวนการทำงานต่าง ๆ ซึ่ง Bytecode ที่อยู่ใน Runtime Data Area จะถูกประมวลผลด้วย Execution Engine โดยจะอ่าน Bytecode และประมวลผลทีละบรรทัด
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🌟 Native Method Interface
เป็น Interface ที่ใช้โต้ตอบกับ Native Method Library ทำให้ JVM สามารถเรียกใช้งาน C/C++ library ได้นั่นเอง
🌟 Native Method Library
เป็นที่รวบรวม Native Library ที่จำเป็นต่อการใช้งานใน Native Method Interface นั่นเอง
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จบกันไปแล้วววว! หากใครมีอะไรเพิ่มเติม สามารถคอมเมนต์พูดคุยกันได้เลยน้าาา และหวังว่าจะเป็นประโยชน์กับเพื่อน ๆ นะคร้าบบบบ 🥰
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borntoDev - 🦖 สร้างการเรียนรู้ที่ดีสำหรับสายไอทีในทุกวัน
同時也有9部Youtube影片,追蹤數超過361萬的網紅Dan Lok,也在其Youtube影片中提到,They Want You To Be Poor And Nobody Can Change It But Yourself. This Is The Speech That Broke The Internet! If You’re Sick And Tired Of Following The ...
virtual method 在 IELTS Thanh Loan Facebook 的最佳貼文
TỪ VỰNG ‘XỊN’ & Ý TƯỞNG ‘HAY’ CHO IELTS WRITING - CHỦ ĐỀ
✔️ the advent of something (noun phrase): the coming of an important event, person, invention, etc.
Vietnamese: sự xuất hiện, ra đời của cái gì
✔️ electronic mail (noun phrase): the same as e-mail
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Vietnamese: email, thư điện tử
✔️ netizen (noun) (informal): a person who uses the Internet a lot
Vietnamese: người sử dụng Internet nhiều
✔️ electronic equipment (noun phrase): The necessary items for a particular purpose running by electricity
Vietnamese: Đồ điện tử
✔️ revolutionize (verb): Change (something) radically or fundamentally.
Vietnamese: Cách mạng hóa
✔️ paper document (compound noun): A piece of written paper
Vietnamese: Tài liệu giấy
✔️ storage (noun): The action or method of storing something for future use
Vietnamese: Kho lưu trữ
✔️ virtual world (noun phrase): Not physically existing as such but made by software to appear to do so
Vietnamese: Thế giới ảo
✔️ information theft (compound noun): The action or crime of stealing information
Vietnamese: Trộm cắp thông tin
✔️ face-to-face (adjective): Close together and facing each other.
Vietnamese: Trực tiếp
✔️ distraction (noun): A thing that prevents someone from concentrating on something else.
Vietnamese: Điều làm mất tập trung
Các bạn đọc bài chia sẻ đầy đủ trên web nhé: https://ielts-thanhloan.com/goc-tu-van/tu-vung-va-y-tuong-ielts-writing-theo-chu-de-science-technology.html
—————————
SẢN PHẨM GIÁO DỤC CỦA IELTS THANH LOAN:
Khoá học Online linh hoạt thời gian, học phí thấp, có chữa bài 1-1: https://online.ielts-thanhloan.com/
Sách IELTS tự biên soạn: https://ielts-thanhloan.com/danh-muc/sach-ielts-thanh-loan-viet
Dịch vụ chữa bài IELTS Writing cho những bạn luyện đề trước khi thi: https://ielts-thanhloan.com/chua-bai-ielts-writing
virtual method 在 Pazu 薯伯伯 Facebook 的最佳貼文
手機號碼跳船策略(中)
文:薯伯伯
上文提及 SIM 卡手機號碼是過時的科技,但卻是識別身份的其中一個有效方法,文章中提了一些場景去說明以上情況,建議先讀〈上篇〉,再讀這篇對策。
之前提出的問題,提及使用 SIM 卡時經常遇到的不便,例如要插入 SIM 卡才能收取驗證碼,而萬一丟失手機及 SIM 卡,即使有新手機,也要補領 SIM 卡後才能重新啟動 Signal 或 WhatsApp 等聊天軟件,費時失事。
最理想的處理方法,是使用「虛擬號碼」,英文叫 virtual number,或 VoIP 號碼。不需要 SIM 卡或電話線,只用透過服務供應商的 app 或網站,即能查看發至該號碼的短訊。
舉個例子,萬一你丟失了手機及 SIM 卡,你只要在新的手機安裝 Signal 或 WhatsApp,輸入虛擬號碼,然後登錄虛擬手機 app,即能收取驗證碼,極之方便,尤其身處外地之時。
一,虛擬號碼
虛擬電話通常是美國號碼,也就是開頭是 +1 字頭,成功申請後,這個 +1 字頭的電話號碼,將會成為 Signal 或 WhatsApp 等對外公開的號碼。坊間提供虛擬號碼的服務供應商雖多,但有些號碼似乎曾經過度使用,登記甚麼服務也會出現問題,另一些則要月費數十至百多元港幣,有比較之下就覺得不算太值得。
我測試最多的服務商有三家:MySudo、Google Voice 及 TextNow。我先說我最不推介的服務吧,不推介 TextNow,他們提供的號碼似乎有不少都曾經重複使用,登記服務時經常遇到問題,得物無所用,極不推介。
那就餘下 MySudo 及 Google Voice。兩者之間,我較為喜歡 Google Voice,但在這裡則會推介 MySudo。我雖然很想推介 Google Voice,但除非你身處美國,本身又有美國當地的手機號碼,否則申請過程頗為困難。即使用了 VPN 並連接至美國伺服器 ,Google 似乎偵測到是用 VPN 連線而拒絕服務申請。
比較容易讓大眾去申請的虛擬號碼服務,是 MySudo。下載該 app,必須要透過美國的 App Store,而不能使用香港 App Store。我一向很鼓勵離岸,所以除了銀行戶口要離岸,其實 App Store 也應該要離岸,這裡示範如何申請美國版的 App Store。
MySudo: https://mysudo.com
(這裡示範用 iPhone 設置,Android 手機用戶申請過程應該大同小異,請朝這個方向自己摸索一下。對了,其實很多時寫文章,就只是想開個方向,讓讀者自行探索一下,這樣會更有趣。)
申請美國版 App Store:
這部份最好在電腦上完成:
1. 使用 VPN,連接到美國伺服器。
2. 使用 Firefox 或其他瀏覽器,打開 https://appleid.apple.com/
3. 點擊 Create your Apple ID。
4. 輸入自己的資料,要填寫真實的電郵地址,要跟香港 App Store 的登錄電郵不同,這將是你的戶口登錄資料,稍後要收取一個驗證碼。
5. Country 選 United States。
6. 電話號碼,出奇地,可以使用香港電話,使用 +852,填上香港號碼,稍後要收取驗證碼。
完成以上步驟之後,轉用 iPhone 或 iPad:
1. 建議在手機上先開啟 VPN,連接去美國伺服器。
2. 打開 App Store,把原先的戶口退出。退出的方法,是點擊右上方的頭像,掃至最底,選擇 log out。
3. 登入美國帳號的資料,系統會顯示「This Apple ID has not been used in iTunes Store.」(這個Apple ID還沒有在 iTunes 商店中使用過。)
4. 選擇 Review,然後等待一會,畫面會一片空白,可能要等一分鐘。
5. 確保寫著 United States,選擇 Agree to Terms and Conditions(同意條款),選擇 Next。
6. Payment Method(付費方式):選擇 None。
7. Billing Address(帳單地址):寫個美國地址及電話,自己想,他們不查證。
8. 填完地址選 Next。
9. 如果出現 Apple ID Completed,這就代表你已經成功開設了 App Store 的離岸戶口了!
有關美國 App Store 戶口充值的方法,實在太多細節,請看看之前我寫的文章: https://www.patreon.com/posts/39576067
之後要用美國版 App Store 下載 MySudo:
1. 用美國的 App Store 戶口,下載免費的應用 MySudo:https://mysudo.com/
2. 用 VPN 連接到美國的伺服器。
3. 打開 MySudo,如果起始畫面一直沒有任何動靜,可能因為你還未連接到美國 VPN 吧。
4. 在 MySudo 的介面,選擇 Create your first Sudo。
5. 按 Next。如果這裡出現問題,可以嘗試重新連接 VPN,選擇另一些美國的伺服器。如果仍然出現問題,可能你以前曾經使用同一個美國 Apple ID 下載並申請過 MySudo,所以顯示出錯,要用一個之前沒有下載過 MySudo 的美國 Apple ID 再試一次。
6. 輸入名字,暫時輸入真名都可以,之後隨時可以改動,選 Next。
7. 關鍵步驟,選擇號碼,按 Create a Phone Number。
8. 選擇美國(其他國家也可以,按自己情況決定),輸入自己喜歡的三位數字組合,例如 314(314 是密蘇里州聖路易)
9. 選擇心水號碼,選定之後就不能更改了。
10. 之後會問能否取用咪高風,選擇不允許。
11. 選擇名字,這個名字要選個合用,因為之後修改較麻煩。
12. 之後問能否傳送通知,選擇「允許」。
MySudo 的免費版本,提供一個美國的虛擬號碼(也有英國號碼,但我沒有試用過),縱然這裡提供的虛擬號碼是免費,但亦可以接收認證短訊,能用作登記 Signal、Telegram 及 WhatsApp,亦能夠接受不少證券行、交易所之類的二步認證碼,但 VoIP 的號碼不能用作申請美國版本的 PayPal。
我申請的時候,MySudo 號碼是可以一直保留,但近日收到一些讀者回應,指 MySudo 號碼一個月不使用就會過期,我覺得也值得付費保留號碼,而且收費不貴,最便宜的收費計劃一個月才 US$ 0.99。
由於美國 App Store 不支援香港信用卡,所以最好最方便最快捷亦是較為安全的充值方法,是購買 Apple Gift Card(以前有分 iTunes 卡或 Apple Store 卡而且互不兼容,現在統一了,方便易明)。先到 https://www.apple.com/shop/buy-giftcard/giftcard ,選擇 Email,選擇 Other Amount,輸入 $10 試玩一下吧,在 Recipient/Sender Name 輸入自己(可以是代號), Recipient/Sender Email 輸入自己電郵地址(要能接收訊息)。之後填信用卡資料時,只要確保信用卡號碼、日期及 CVC 正確就可以,至於 billing address 即使填了美國,其實也會通過的。可以支付的信用卡,例如獅子銀行信用卡、八達通 app 內的 MasterCard 等,比較容易出問題或被拒絕的是 DBS。支付後等一小時,收到禮品卡就按照指示充值。我自己最喜歡用這個方法充值,而不是把信用卡綁定在 App Store 內,方便易容,又減少信用卡被盜的風險。
🚫 注意:切勿把這個美國號碼登記接收銀行驗證碼,否則一些銀行以為你與美國有關,中了 FATCA(《美國海外帳戶稅收遵從法》,Foreign Account Tax Compliance Act)並要求你經常填寫表格 W-8BEN 申報,很麻煩。其他則沒有問題,只要不用來收銀行短訊就可以。
有一點必須留意,截至 2021 年 1 月 22 日,MySudo 仍然不能在 iPhone 與 Android 之間轉移,但該公司網站上稱會考慮加入此功能。而 MySudo 的備份一定要做得好,這個 app 用 iCloud 也合適(如果開 iCloud,其他大多數 app 的數據其實都沒必要同步,但 MySudo 有點例外)。如果沒有做好備份可能會失去這個號碼,所以要小心,做好備份。
二,把虛擬號碼融進日常生活
申請了並保存了虛擬號碼,確保 MySudo 的備份做得完美,那就開始逐步把虛擬號碼融進日常生活,取代用了十多年的電話號碼。
這部份還是留待續篇才寫。
注:我稍後(一月底)會在 Patreon 較私密的空間,再探討一下另一個我很推介的虛擬號碼 Google Voice 的申請及應用,但考慮到該文觸及 Google 的灰色地帶,所以設定為 Patreon 的獨家文章。反正大部份文章都是公開,有時設置一兩篇為 Patreon exclusive,我會原諒我自己的任性。
圖:Pixabay / mohamed_hassan
手機號碼跳船策略(上):https://www.patreon.com/posts/46473280
手機號碼跳船策略(中):https://www.patreon.com/posts/46491016
手機號碼跳船策略(下):https://www.patreon.com/posts/46695482
手機號碼跳船策略(番外篇):https://www.patreon.com/posts/46736756(Patreon 獨家文章)
🔑 【資訊保安文章整理,超務實長清單】 https://www.patreon.com/posts/46192115
▶️ 請訂閱 Patreon 頻道,支持不受干預的獨立創作及評論 | www.patreon.com/pazu
virtual method 在 Dan Lok Youtube 的精選貼文
They Want You To Be Poor And Nobody Can Change It But Yourself. This Is The Speech That Broke The Internet! If You’re Sick And Tired Of Following The Traditional Path Hoping To Become Successful, Click Here To Find Out Your High Income Skill: http://whowantsyoutobepoor.danlok.link
You’ve been lied to your whole life. Society doesn’t want you to win big. They want you to be poor. They want you to follow an almost “ancient” path to success and fulfillment in life, which may have worked 60 years ago. What is that method and does it work today if you want to become successful, wealthy, and fulfilled? Watch Dan’s speech here to find out.
? SUBSCRIBE TO DAN'S YOUTUBE CHANNEL NOW ?
https://www.youtube.com/danlok?sub_confirmation=1
Check out these Top Trending Playlists -
1.) Boss In The Bentley - https://www.youtube.com/playlist?list=PLEmTTOfet46OWsrbWGPnPW8mvDtjge_6-
2.) Sales Tips That Get People To Buy - https://www.youtube.com/watch?v=E6Csz_hvXzw&list=PLEmTTOfet46PvAsPpWByNgUWZ5dLJd_I4
3.) Dan Lok’s Best Secrets - https://www.youtube.com/watch?v=FZNmFJUuTRs&list=PLEmTTOfet46N3NIYsBQ9wku8UBNhtT9QQ
Dan Lok is a Chinese-Canadian business magnate and global educator known for being the founder and chairman of Closers.com - the world’s #1 virtual-closers network, Copywriters.com, and SalesCalls.com. Beyond his businesses, Mr. Lok has led several global movements to redefine modern education where he has taught individuals from 150+ countries to develop high income skills and financial confidence.
Beyond his success in business, he was also a two time TEDx opening speaker. An international best-selling author of 12+ books. A member of Young Presidents Organization (YPO) - a private group of global chief executives whose companies employ 22 million people and generate 9-trillion USD in annual revenues. He also hosts The Dan Lok Show - a series on elite business tycoons and world-leading entrepreneurs.
Today, Mr. Lok continues to be featured in thousands of media channels and publications every year and is widely seen as one of the top business leaders by millions around the world.
If you want the no b.s. way to master your financial destiny, then learn from Dan. Subscribe to his channel now.
★☆★ CONNECT WITH DAN ON SOCIAL MEDIA ★☆★
YouTube: http://youtube.danlok.link
Dan Lok Blog: http://blog.danlok.link
Facebook: http://facebook.danlok.link
Instagram: http://instagram.danlok.link
Linkedin: http://mylinkedin.danlok.link
Podcast: http://thedanlokshow.danlok.link
#DanLok #TheyWantYouToBePoor #Poor
Please understand that by watching Dan’s videos or enrolling in his programs does not mean you’ll get results close to what he’s been able to do (or do anything for that matter).
He’s been in business for over 20 years and his results are not typical.
Most people who watch his videos or enroll in his programs get the “how to” but never take action with the information. Dan is only sharing what has worked for him and his students.
Your results are dependent on many factors… including but not limited to your ability to work hard, commit yourself, and do whatever it takes.
Entering any business is going to involve a level of risk as well as massive commitment and action. If you're not willing to accept that, please DO NOT WATCH DAN’S VIDEOS OR SIGN UP FOR ONE OF HIS PROGRAMS.
This video is about THEY WANT YOU TO BE POOR - The Speech That Broke The Internet!
https://youtu.be/bv728cTg1nY
https://youtu.be/bv728cTg1nY
![post-title](https://i.ytimg.com/vi/bv728cTg1nY/hqdefault.jpg)
virtual method 在 Dan Lok Youtube 的精選貼文
Do You Think Dan Peña’s QLA Methodology For You? This Video Will Give You The Behind-The-Scenes Of What It Takes… If You Want To Know Dan’s Best-Kept Business Secrets & QLA Takeaways, Click Here: http://qlamethodology.danlok.link
After attending his mentor, Dan Peña’s, castle seminar to attend his QLA seminar for the second time, Dan sits down and gives you the behind-the-scenes of how hardcore it is and what you learn from it. So if you’ve ever wondered if Dan Peña’s QLA methodology is for you, watch this video.
? SUBSCRIBE TO DAN'S YOUTUBE CHANNEL NOW ?
https://www.youtube.com/danlok?sub_confirmation=1
Check out these Top Trending Playlists -
1.) Boss In The Bentley - https://www.youtube.com/playlist?list=PLEmTTOfet46OWsrbWGPnPW8mvDtjge_6-
2.) Sales Tips That Get People To Buy - https://www.youtube.com/watch?v=E6Csz_hvXzw&list=PLEmTTOfet46PvAsPpWByNgUWZ5dLJd_I4
3.) Dan Lok’s Best Secrets - https://www.youtube.com/watch?v=FZNmFJUuTRs&list=PLEmTTOfet46N3NIYsBQ9wku8UBNhtT9QQ
Dan Lok is a Chinese-Canadian business magnate and global educator known for being the founder and chairman of Closers.com - the world’s #1 virtual-closers network, Copywriters.com, and SalesCalls.com. Beyond his businesses, Mr. Lok has led several global movements to redefine modern education where he has taught individuals from 150+ countries to develop high income skills and financial confidence.
Beyond his success in business, he was also a two time TEDx opening speaker. An international best-selling author of 12+ books. A member of Young Presidents Organization (YPO) - a private group of global chief executives whose companies employ 22 million people and generate 9-trillion USD in annual revenues. He also hosts The Dan Lok Show - a series on elite business tycoons and world-leading entrepreneurs.
Today, Mr. Lok continues to be featured in thousands of media channels and publications every year and is widely seen as one of the top business leaders by millions around the world.
If you want the no b.s. way to master your financial destiny, then learn from Dan. Subscribe to his channel now.
★☆★ CONNECT WITH DAN ON SOCIAL MEDIA ★☆★
YouTube: http://youtube.danlok.link
Dan Lok Blog: http://blog.danlok.link
Facebook: http://facebook.danlok.link
Instagram: http://instagram.danlok.link
Linkedin: http://mylinkedin.danlok.link
Podcast: http://thedanlokshow.danlok.link
#DanLok #DanPeña #QLAMethodology
Please understand that by watching Dan’s videos or enrolling in his programs does not mean you’ll get results close to what he’s been able to do (or do anything for that matter).
He’s been in business for over 20 years and his results are not typical.
Most people who watch his videos or enroll in his programs get the “how to” but never take action with the information. Dan is only sharing what has worked for him and his students.
Your results are dependent on many factors… including but not limited to your ability to work hard, commit yourself, and do whatever it takes.
Entering any business is going to involve a level of risk as well as massive commitment and action. If you're not willing to accept that, please DO NOT WATCH DAN’S VIDEOS OR SIGN UP FOR ONE OF HIS PROGRAMS.
This video is about Is Dan Peña's QLA Methodology For You (Advanced)
https://youtu.be/xoI8PR6B2Sg
https://youtu.be/xoI8PR6B2Sg
![post-title](https://i.ytimg.com/vi/xoI8PR6B2Sg/hqdefault.jpg)
virtual method 在 織田信姫 Youtube 的精選貼文
あんた達、"システマ"って知ってる?
そう、ロシアの格闘技、システマよ。
あたしはこのシステマにおいて、呼吸法に注目したわ。
どうやら、痛みを0にする事が出来るそうよ。
そしてあたしは長い修練の果てに遂に辿り着いたわ…。
🌸For International Viewers🌸
Thank you for watching my videos.
I am Nobuhime Oda, a Virtual YouTuber from Japan.
I am "Virtual YouTuber," so not like other YouTubers, I am digital.
I've been posting some videos, so if you like them, please subscribe and watch more.
I'll work hard, so I'll be delighted if you support me.
For international viewers, the subtitles are necessary.
The subtitles are edited by the viewers.
If you could translate the subtitles into your mother language, more people could enjoy watching our videos.
I'll be delighted if you cooperate with editing the subtitles.
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![post-title](https://i.ytimg.com/vi/9IlegF9Z5Ds/hqdefault.jpg?sqp=-oaymwEbCKgBEF5IVfKriqkDDggBFQAAiEIYAXABwAEG&rs=AOn4CLDarYf-Gdi7b09fFNBA6QWS6vWBGw)