core java programming interview questions

The main content index of this article1. Java Threads2. Threading Model3. Java thread pool4. Future (various future)5. Fork/join Frame6. Volatile7. CAS (Atomic operations)8, AQS (concurrent synchronization framework)9, synchronized (synchronous lock)10. Concurrent queue (blocking queue)This article only analyzes some of the core problems in

Now that we are in the 21st century, it is hard to imagine that Java-related books are so scarce, but this is just the case with Java. All the Java-related books were basically published by several Sun engineers, such as the "Hooked on Java" written by Arthur Van Hoff et.al and "The

This blog is mainly for the ape friends to recommend a book, "Java multithreaded Programming core technology."The reason to recommend it, mainly because this book is very easy to understand, with examples throughout the book, so that the original concept of abstraction, understanding is no longer abstract.As long as you have a little bit of

Recommendation of Java multi-thread programming Core Technology I wrote this blog to recommend a book "Java multi-thread programming core technology" to yuanyou. It is recommended mainly because it is easy to understand and runs

1365.2 Split iterators with fork/join1455.3 Exception 1495.4 Example Description: Recursive grep1555.5 Summary 166Chapter 6th performance of Flow 1676.1 Micro-Benchmark Metric 1706.1.1 Measuring Dynamic Runtime 1716.1.2 Java microbenchmarking Harness1736.1.3 Test Method 1746.2 Select execution Mode 1786.3 Stream Characteristics 1816.4 Sort 1846.5 stateful operation and stateless operation 1876.6 Packing and Unpacking 1886.7 Split iterator Performance

1. Threads and processesThere are many examples of processes and threads, because it is a learning note, that is, I feel very good understanding, is that we use the QQ every day, But we run the QQ.exe program, the process begins, we can open the Chat window at the same time, can be more than one video, and even the video side of the manual chat (maybe the sound is broken ...) Each of these tasks can be fully understood as a "thread" in the work, music, image emoticons, files and other functions

Concurrent programming is one of the most important skills of Java programmers and one of the most difficult to master. It requires the programmer to the computer at the bottom of the operating principles of a deep understanding, but also requires the programmer logic clear, thoughtful, so as to write efficient, safe, reliable multithreaded concurrent programs. This series begins with the nature of the thre

Scala, inheriting a base class is similar to Java, with a two-point limit, and (1) Overriding the method requires the Override keyword, (2) only the primary constructor can pass parameters to the base class constructor. Markerfactory is a single case, once the definition is complete, its name represents the only instance of the singleton object, and the singleton can be passed to the function as if it were a typical passing instance.

);　　Result.setsecond (Maxmanager); Manager m=(Manager) Result.getfirst (); System.out.println (M.getbonus ()); }　　8.3 SummaryIn general: Wildcard characters with a super-type qualification can be written to a generic object, and wildcard characters with sub-type qualification can be read from generic objects.　8.4 Schedule (Manager Class) Packagecom.ebao.gs.pol.nb.test; Public classManager {PrivateLong ID; PrivateString name; PrivateDouble Bonus; PublicManager (Long ID, String name, Doubl

Java an overview of the core technology programmingI. Features of the Java languageSimple line: Learn from C + +, excluding the C + + infrequently used pointers, structures, etc., to increase garbage collection.Object-oriented: different from C + + is single inheritance, but can inherit multiple interfaces. Fully object-oriented language;Network skills: Socket,ft

. String---> Byte streamCombines the functions of both bufferedwriter/outputstreamwriter2. can automatically refreshNew PrintWriter (os,true);UDP User Data Message Protocol-------------------------------------------1) Consider the efficiency of data transmission, reliability is not guaranteed2) Not necessarily a one-to-many communication, such as broadcasting3) non-connected, unreliable transmission modeDatagramsocket responsible for sending and receiving data such as the PostmanDatagrampacket d

Java core programming-file filtering class (FileFilter and FilenameFilter ), 1. FileFilter Package test; import java. io. file; import java. io. fileFilter; public class FileFilterTest implements FileFilter {private String extension; public FileFilterTest (String extension)

Java core programming-byte stream of IO stream (2), javaio 1. byte stream A 1.1-byte stream is a stream that operates byte. Byte streams can operate on any data, such as media data, music, movies, and images. Of course, they can also operate on characters. Byte stream is based on byte stream, we know that a byte is 8 binary bits, a byte corresponds to an English

routine to review the concepts that we have described earlierPackage pair3; Public classpairtest3{ Public Static void Main(string[] args) {Manager CEO =NewManager ("Gus greedy.",800000,2003, A, the); Manager CFO =NewManager ("Sid Sneaky",600000,2003, A, the); PairNewPair1000000); Cfo.setbonus (500000); Manager[] Managers = {CEO, CFO}; pairNewPair out. println ("First:"+ Result.getfirst (). GetName () +", Second:"+ Result.getsecond (). GetName ()); Maxminbonus (managers, result); Syste

Java core programming-File operations, javafile 1. Overview Access to the File system is required for each language. java provides the File class to create, rename, delete, operate on the File list, and determine whether the File or directory exists. 2. Operations on files/Directories The operations include: 1: Create

The basic course of Java language programming Practice Study Questions Reference answers 1th Chapter Java Programming Overview 1.9 Practice Study Questions 1, the Java running pl

A termJdk:java delelpment JitJre:java Runtime EnvironmentSecond, installation jdk1.8.0_25Setting environment variables (recommended to be installed directly under C-drive), using;C: \java\jre1.8.0_25\bin;Third, unzip the source file methodEnter C: \java\jre1.8.0_25Create SRC subdirectorymkdir SRCCdsrcUnzip the fileJar XVF. \src.zipI. Using command-line toolsJava Helloworld.java with

-generated Catch blockE.printstacktrace (); } }}4. Use Ruturn to stop the thread Public classMyThreadextendsThread {@Override Public voidrun () { while(true) { if( This. isinterrupted ()) {System.out.println ("Stop it!"); return; } System.out.println ("Timer=" +System.currenttimemillis ()); } } Public Static voidMain (string[] args)throwsinterruptedexception {MyThread T=NewMyThread (); T.start (); Thread.Sleep (2000); T.interrupt (); }}Results:Two(1) Advantages

Java core programming-IO stream Overview (-), javaio 1. Four most critical parent classes of java io streams ~ InputStream (input byte stream) ~ OutputStream (output byte stream) ~ Reader (input stream) ~ Writer (output streams) All the above four classes are public abstract class classes. InputStream and Output

=NewOutputStreamWriter (FileOutputStream); //building character output stream objectsBufferedWriter BufferedWriter =NewBufferedWriter (OutputStreamWriter); //Building Data Char[] chars =New Char[3]; chars[0] = ' a '; chars[1] = ' B '; chars[2] = ' Medium '; //Output DataBufferedwriter.write (chars); //Close the streamBufferedwriter.close (); Outputstreamwriter.close (); Fileoutputstream.close (); } Catch(FileNotFoundException e) {e.printstacktrace (); } Catch(IOExce