java multithreading interview questions

the progress is updated, the progress bar is changed accordingly. If the progress is tracked by multiple threads, call the Invokeandwait () method to request the event dispatch thread to update the component accordingly. The Invokelater () method is called to update the component asynchronously.138, what is the busy loop in multi-threading?A busy loop is when a programmer uses a loop to wait for a thread, unlike the traditional method wait (), sleep () or yield (), which discards CPU control, a

the progress is updated, the progress bar is changed accordingly. If the progress is tracked by multiple threads, call the Invokeandwait () method to request the event dispatch thread to update the component accordingly. The Invokelater () method is called to update the component asynchronously.138, what is the busy loop in multi-threading?A busy loop is when a programmer uses a loop to wait for a thread, unlike the traditional method wait (), sleep () or yield (), which discards CPU control, a

Java interview question Summary 2 (Continuous updates), java questions 1. How to format a date Answer:Date now = new Date (); SimpleDateFormat sdf = new SimpleDateFormat ("yyyy-MM-dd hh: mm: ss "); String formatNow = sdf. format (now ); The formatNow variable is the formatted date. 2. What are several implementation m

growth.Variables are changed and other threads can immediately know. There are several ways to ensure visibility: Volatile Variables added to the volatile keyword will be compiled with a lock prefix directive, which is equivalent to a memory barrier, the memory barrier can guarantee the order of memory operations. When a variable declared as volatile is written, the variable needs to write the data to main memory.Because the processor implements the cache consistency protocol, wri

Java Algorithm interview questions: What are the methods for sorting? List. Use JAVA to implement a fast sorting. Select bubble quick set to sort by at least four methods, java Algorithm Package com. swift; import java. util. arra

Summary and Induction of JAVA interview questions of Niuke Network (1), Niuke javaPreface Today, I saw an article on explaining the Spring framework in the Nuggets. The article mentioned Niu Ke's interview questions. As a result, I downloaded the Niuke web app and found that

Interview Questions for Java engineers [social recruitment], java engineers Http://blog.csdn.net/jackfrued/article/details/44921941 1. What are the features of object orientation?2. What are the differences between access modifiers public, private, and protected?3. Is String the most basic data type?4. Is float f = 3.4

Java Collections Interview QuestionsIn Java, collection interview questions is mostly asked by the interviewers. Here are the list of mostly asked collections interview questions with a

It is said that this is an interview question from Alibaba: It is also said that the author of this question has gone to tmail. The following is a description of the question: This code runs normally in most cases, but in some cases there may be problems. When will there be any problems? How to fix it? Visible blog http://yueyemaitian.iteye.com/blog/1387901 Java code Public class mystack { Private list

Many of the core Java face questions come from multithreaded (multi-threading) and collection frameworks (collections framework), which are required to understand the core threading concepts. This article collects some typical Java threading problems that are often asked by senior engineers. 0. What is multithreaded synchronization in

1. Three ways to realize multithreading1. Follow the thread class and cover the Run () method to2.implements runnable Interface3.implements Callale interface, execute with Futuretask to start thread2, Thread synchronization methodSynchronized, lock3, ThreadLocalWhen you use threadlocal to maintain a variable, threadlocal provides a separate copy of the variable for each variable that uses the thread, so that each thread can operate its own copy of the variable independently.There are four method

dispatch and dispatch, and a smaller unit that can run independently than a process. Thread's StrokeThe sub-scale is less than the process, which makes the multi-threaded procedure highly concurrency, and the process typically has independent memory units at execution time, while the threads can share memory. Programming with multithreading often leads to better performance and user experience,But multithreaded programs are unfriendly to other progra

., GC can avoid memory leaks and stack overflow, effectively improve the efficiency of memory utilization, It also frees programmers from tedious memory management.The string S=new string ("xyz"); How many stringobject are created?2, 1 in the text pool, 1 in the heap, first create 1 "XYZ" objects in the text pool, and then copy an "XYZ" object in the heap and assign it to the reference S.Ninth, Math.Round (11.5) How much? Math.Round (-11.5) how much?Math.Round (x) equals (int) Math.floor (x+o.5f

Java, which meansThird-party applications developed by the SDK must use the Java language. However, this is not equivalent to "third-party applications can onlyUse Java ". At the first release of the Android SDK, Google claimed that its virtual machine Dalvik supported JNI programming.Method, that is, third-party applications can call their own C dynamic library