跟讀練習: 🚫 Java Deadlock Explained: Why Your Code is Stuck 😱 (Beginners Must Watch!) - 通過影片學習英語口語
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146 句
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We have seen deadlock example.
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We have given the example of the lock.
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But we are going to read deadlock officially.
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I will give you a example of how the code looks.
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We will see deadlock doesn't work.
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We will see how it will resolve.
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First of all, what is formal definition?
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In multi-threading, deadlock is a situation where the threats are always blocked.
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And they depend on the other side.
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For example, A and B, A has a pen and a paper.
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A waits for B, when he gives a paper, then I start to write.
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B waits for A, when he gives a pen, then I start to write.
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Just, nothing is wrong.
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One is waiting for another.
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So, the work will not be wrong and wait for forever.
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So, this is a condition called deadlock.
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Formal, formal.
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Formal, when it comes to match, the deadlock is called.
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Mutual exclusion.
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Sir, our critical section is called, which should be locked.
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First thing is obvious.
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Then there will be a wait.
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Another thing is, Hold and wait.
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A thread holding at least one resource is waiting to acquire.
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Obviously.
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Third thing is no preemption.
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You can't remove pen or pencil.
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You can't remove paper.
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We haven't read this yet.
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It's circular wait.
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This is obvious.
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The obvious thing is, they divide in 4 parts.
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It's false.
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But obviously, if someone's mind is bad, then they can ask.
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Okay, sir.
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So, theory has happened.
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Sir, a real life example.
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I have given you a class pen and a class paper.
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What is written in pen?
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Write with pen and paper.
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It is a method.
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It is called paper.finishedWriting.
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Another class is class paper.
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It is called write with write with paper and pen.
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And then finish writing method.
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I am going to show you the functionality.
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What is written in the upper part?
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I will go in the upper part.
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I will make two threads.
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Task 1.
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The next thread is task 2.
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In the main thread, a pen and a paper and the threads are made.
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Then I will start.
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I am giving a high level overview.
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Thread 1 is using pen and is trying to use paper.
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Thread 2 is using paper and trying to use pen.
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And it's going infinitely.
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I will close it to forcefully.
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The condition is the same.
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Two threads have two people.
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One has pen and trying to use paper.
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The other one has B.
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The other one has paper and trying to use pen.
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The solution is not coming.
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This is deadlock.
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Now, look at the code.
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There are two methods, paper, and two threads.
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Task 1 and Task 2.
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We will create the object in that two objects.
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Pen and paper.
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Similarly with Task 2.
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When we create the object in Task 2, we will create the object in the constructor.
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Obviously, one pen will be and one paper.
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So, two people are.
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Thread 1 and Thread 2.
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There are two things.
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One pen and one paper.
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Thread 1 is written in the first one.
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One person has pen.
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Pen.Write with pen and paper.
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The other person has paper.
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Now we are going to pen and paper class.
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Pen has two methods.
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Write with pen and paper and finish writing.
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Paper has two methods.
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Write with paper and pen and finish writing.
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Pen has been written in thread 1.
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Synchronize is put.
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When a method is declared by synchronized keyword,
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this method will acquire the intrinsic lock of the object the method belongs to.
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Pen will acquire the method.
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Pen will acquire the method.
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And then, paper.finish writing.
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This method will need paper and pen,
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so it comes to paper and pen.
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and he is trying to run pen.finish writing.
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When will it run pen?
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When it has a pen lock.
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What do you mean?
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It depends on the other one.
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What is thread 1?
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It has a pen.
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And trying to use paper.
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Similarly thread 2 is using paper and trying to use pen.
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But nothing is happening.
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Then we close it.
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What is deadlock?
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If it has not been done, then see it again.
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I am saying it again.
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Now I need to resolve this, I need to resolve this, deadlock is not necessary.
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So what can I do?
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There are many strategies.
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What is common approach?
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Ensure that all the threats are consistent order to acquire locks.
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Consistent order means that multiple threats which are required to acquire locks and multiple resources,
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they should always acquire the resources in the same sequence.
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Class pen and paper Here is the lock acquired.
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What is the lock?
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The pen and paper are the same.
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We will do the same work.
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If we change the lock, then the result will be deadlock.
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Now, Task 1 is going to lock pen and paper.
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Task 2 is going to lock pen and pen.
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What do we do?
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We use the synchronized keyword.
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We want to lock and pen.
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We will say Task 2 is going to lock pen and pen.
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Then, paper can lock.
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This is the two things.
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I will put it here.
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It will make sure that thread 2 is going to lock pen.
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When you have pen lock, it's a good thing.
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But pen lock is a thread 1, no matter what you will do.
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And paper lock will come, because thread to run not.
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Because thread to run, you should have pen lock, then paper lock will acquire.
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So, understand how now.
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If we change ordering, consistent ordering,
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lock will acquire, we can resolve the deadlock.
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Okay?
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Now, keep the tension so much.
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Keep the tension so much.
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Sir, we have a small example which we have resolved.
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That's it.
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Keep the tension so much.
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Keep the tension so much.
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Okay, sir.
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本片段的口語練習目標
這段影片不僅能幫你瞭解程式設計知識，更是提升英語口語流暢度的好素材。它的語速適中，邏輯清晰，適合練習資訊類表達的條理性——如何用簡潔的語言解釋複雜概念（比如“死鎖”），如何通過舉例讓描述更生動。這正是英語口語練習中關鍵的“說明性表達”能力，能幫你在工作或學習場景中更準確地傳遞資訊。
實用短語庫
- “a situation where...”：用來定義某種情況，比如“deadlock is a situation where the threads are always blocked”（死鎖是執行緒一直被阻塞的情況）。
- “for example”：舉例時的常用過渡詞，影片中多次用它來解釋抽象概念，讓表達更易懂。
- “first of all”、“then”、“third thing is”：邏輯連線詞，能讓你的敘述更有層次，適合在說明步驟或條件時使用。
- “it is called”：用於介紹術語，比如“this is a condition called deadlock”（這種情況被稱為死鎖）。
攻克口語弱點
影片中存在不少連讀和弱讀現象，比如“waiting for”會讀成“waitin' for”，“acquire”的重音在第二音節。這些細節容易被忽略，但卻是影響口語地道性的關鍵。建議用shadow speech（影子跟讀）的方式練習：播放一句，暫停，立刻跟讀，模仿發音和節奏。你可以找一個合適的shadowing site，反覆操練這些片段。此外，影片中“formal definition”、“critical section”等專業詞彙的發音也需要注意，通過跟讀能讓你在使用這些詞時更自信。堅持這樣的英語口語練習，你的聽力和口語流暢度都會顯著提升。
影片中的語法
說話人最常用的結構，並附上影片中的原話：
| 結構 | 影片中的用法 |
|---|---|
| 被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的 | are always blocked · is called · is written |
| 現在完成時 have/has + 過去分詞 — 過去發生但與現在仍有關聯的事 | have seen · have given · haven't read |
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。