This question already has an answer here: What is the difference between a HashMap and a TreeMap? [duplicate] 8 answers Difference between HashMap, LinkedHashMap and TreeMap 16 answers
这个问题在这里已经有了答案： HashMap和TreeMap有什么区别？ [复制] 8个答案 HashMap，LinkedHashMap和TreeMap之间的区别16个答案
This question already has an answer here: Difference between HashMap, LinkedHashMap and TreeMap 16 answers What is the difference between a HashMap and a TreeMap? [duplicate] 8 answers Given that there are not many collissions hashmaps will give you o(1) performance (with a lot of colissions this can degrade to potentially O(n) where N is the number of entries (colissions) in any single bu
这个问题在这里已经有了答案： HashMap，LinkedHashMap和TreeMap之间的区别16个答案 HashMap和TreeMap有什么区别？ [复制] 8个答案 考虑到没有多少混合，hashmaps会给你o（1）的表现（有很多的混合，这可能会降级到潜在的O（n），其中N是任何单个桶中的条目数量（colissions））。 另一方面，如果您想要某种平衡的树结构，可以产生O（logN）检索，则使用TreeMaps。 所以这取决于你的特定用例。 但是，如果你只是想访问
This question already has an answer here: Difference between HashMap, LinkedHashMap and TreeMap 16 answers What is the difference between a HashMap and a TreeMap? [duplicate] 8 answers Hashtables (usually) perform search operations (look up) bounded within the complexity of O(n)<=T(n)<=O(1) , with an average case complexity of O(1 + n/k) ; however, binary search trees, (BST's),
这个问题在这里已经有了答案： HashMap，LinkedHashMap和TreeMap之间的区别16个答案 HashMap和TreeMap有什么区别？ [复制] 8个答案 散列表（通常）执行O(n)<=T(n)<=O(1)复杂度范围内的搜索操作（查找O(n)<=T(n)<=O(1) ，平均复杂度为O(1 + n/k) 。 然而，二叉搜索树（BST）在O(n)<=T(n)<=O(log_2(n))的复杂度范围内执行搜索操作（查找O(n)<=T(n)<=O(log_2(n)) ，平均复杂度为O(log_2(n)) 。 为
This question already has an answer here: Difference between HashMap, LinkedHashMap and TreeMap 16 answers TreeMap is an example of a SortedMap , which means that the order of the keys can be sorted, and when iterating over the keys, you can expect that they will be in order. HashMap on the other hand, makes no such guarantee. Therefore, when iterating over the keys of a HashMap , you can&
这个问题在这里已经有了答案： HashMap，LinkedHashMap和TreeMap之间的区别16个答案 TreeMap是一个SortedMap的例子，这意味着键的顺序可以被排序，并且当遍历键时，你可以期望它们按顺序排列。 另一方面， HashMap没有这样的保证。 因此，在迭代HashMap的键时，不能确定它们将以什么顺序。 一般来说， HashMap效率会更高，所以只要你不关心密钥的顺序就可以使用它。 HashMap由Hash Table实现， TreeMap由Red-Black tr
I have running thread that I would like to stop and later on resume at some point. I learned not to use stop() etc. as these are deprecated and got to this code below that seems to stop thread successfully. It simply exits run method. Now, how can I restart it? If I call start() method it says that thread is still running, so would directly calling run() do in this situation? Would it cause
我正在运行线程，我想停止并稍后恢复。 我学会了不要使用stop（）等，因为它们已被弃用，并得到了下面的代码，似乎停止线程成功。 它只是退出运行方法。 现在，我该如何重新启动它？ 如果我调用start（）方法，它说线程仍在运行，那么直接调用run（）会在这种情况下执行吗？ 会导致任何问题吗？ 顺便说一下，这是Android应用程序，如果这有什么区别。 private volatile stopThread; public void stopButton() { // th
So far what I have understood about wait() and yield () methods is that yield() is called when the thread is not carrying out any task and lets the CPU execute some other thread. wait() is used when some thread is put on hold and usually used in the concept of synchronization. However, I fail to understand the difference in their functionality and i'm not sure if what I have understood is r
到目前为止，我对wait（）和yield（）方法的理解是，当线程不执行任何任务并让CPU执行其他某个线程时，将调用yield（）。 当某个线程处于暂停状态并且通常用于同步的概念时，会使用wait（）。 但是，我不明白它们的功能差异，我不确定我所理解的是对还是错。 有人可以解释他们之间的区别（除了他们出席的包）。 他们是不是都在做同样的任务 - 等待其他线程可以执行？ 甚至没有关闭，因为yield()不会等待任何东西。 每个
Today I had an interview on which I asked candidate quite usual and basic question about the difference between Thread.sleep() and Object.wait() . I expected him to answer something like like this, but he said these methods basically are the same thing, and most likely Thread.sleep is using Object.wait() inside it, but sleep itself doesn't require external lock. This is not exactly a correc
今天我进行了一次面试，我向候选人询问了有关Thread.sleep()和Object.wait()之间差异的常见和基本问题。 我期望他回答这样的问题，但他说这些方法基本上是一样的，最有可能的是Thread.sleep在其中使用Object.wait() ，但sleep本身并不需要外部锁定。 这不完全是一个正确的答案，因为在JDK 1.6中，此方法具有以下签名。 public static native void sleep(long millis) throws InterruptedException; 但我的第二个想法是，这并
Apologies for this repeated question but I haven't found any satisfactory answers yet. Most of the question had their own specific use case: Java - alternative to thread.sleep Is there any better or alternative way to skip/avoid using Thread.sleep(1000) in Java? My question is for the very generic use case. Wait for a condition to complete. Do some operation. Check for a condition.
对于这个重复的问题抱歉，但我还没有找到任何满意的答案。 大部分问题都有自己的具体用例： Java - 替代thread.sleep 有没有更好的或替代的方法来跳过/避免在Java中使用Thread.sleep（1000）？ 我的问题是针对非常通用的用例。 等待条件完成。 做一些操作。 检查一个条件。 如果条件不成立，请等待一段时间再做相同的操作。 例如，考虑通过调用createAPI表创建DynamoDB表的方法。 DynamoDB表需要一些时间才能变为
I have tried to delay - or put to sleep - my Java program, but an error occurs. I'm unable to use Thread.sleep(x) or wait() . The same error message appears: unreported exception java.lang.InterruptedException; must be caught or declared to be thrown. Is there any step required before using the Thread.sleep() or wait() methods? You have a lot of reading ahead of you. From compiler
我试图拖延 - 或者让我睡觉 - 我的Java程序，但发生错误。 我无法使用Thread.sleep(x)或wait() 。 出现相同的错误消息： 未报告的异常java.lang.InterruptedException; 必须被捕获或宣布被抛出。 在使用Thread.sleep()或wait()方法之前是否需要执行任何步骤？ 你有很多的阅读。 从编译器错误到异常处理，线程和线程中断。 但是这会做你想做的事情： try { Thread.sleep(1000); //1000 milliseco
This question already has an answer here: Difference between wait() and sleep() 33 answers sleep(): It is a static method on Thread class. It makes the current thread into the "Not Runnable" state for specified amount of time. During this time, the thread keeps the lock (monitors) it has acquired. wait(): It is a method on Object class. It makes the current thread into the &quo
这个问题在这里已经有了答案： wait（）和sleep（）之间的差异33个答案 sleep（）：这是一个Thread类的静态方法。 它使当前线程进入“Not Runnable”状态达指定的时间。 在此期间，线程保持它获取的锁定（监视器）。 wait（）：它是Object类的一个方法。 它使当前线程进入“Not Runnable”状态。 等待是在一个对象上调用的，而不是一个线程。 在调用wait（）方法之前，对象应该是同步的，意味着对象应该在同步块内。 等