core java programming questions

1. JAVA programming ideology-getting started with objects Object entry If I have learned JAVA and have not read the book JAVA programming ideology, I am sorry to say that I have learned JAVA. In view of this, to is busy, secretly

efficient cache that allows multiple users to read, but only one user is allowed to write in order to maintain its integrity, how will you implement it? The biggest advantage of the lock interface in multi-threaded and concurrent programming is that they provide a lock for both read and write, which satisfies high-performance data structures and conditional blocking that you write like Concurrenthashmap. The question of a

Java Multithreading Core technology carding (with source) Java Multithreading Core Technology combing the source code Write in front Java multithreading Concurrent access to objects and variables Inter-thread communication Use of l

: Network Disk DownloadContent Introduction Editor Cays.horstmann, Gang Fei compiled "Java Core technology" (Corejava) since the 1th edition of the publication, has been the majority of Java program designers favor, best-selling, is the Java classic books. The 8th edition has been comprehensively updated for the JavaSE

1. Briefly describe the robustness of Java programs.A: The Java program will automatically detect errors at compile and run time, and it is a strongly typed language, strict for type checking, and its garbage collection mechanism effectively avoids memory leaks.2. Why is the Java language completely object-oriented? (Actually I don't think it's completely object-

logic.(2) Pessimistic lock: Still like its name, for the thread security problem caused by concurrency, pessimistic locks believe that competition always occurs, so each time the operation of a resource,Will hold an exclusive lock, just like synchronized, regardless of 3,721, directly on the lock on the operation of resources.25. Collection Class: Hashmap,hashtableHashMap: Thread is not secureHashtable: Thread safety is similar to ConcurrenthashmapVector, Hashtable, Properties and Stack are all

Logical Thinking interview questions-java backend interview-,-java backend(-1) Preface I recently participated in an interview and was very interested in the pen questions. I will return to Baidu. Thinking about these questions reminds me of the association in modeling. I fe

Simple Java: Nine Frequently Asked Questions about Java Maps, simplemaps In general, Map is a data structure composed of key-value pairs. The key cannot be repeated in Map; This article summarizes the nine most common problems (about Java Map and Its Implementation classes ); For the sake of simplicity, I will not use

drink the box of other things equals () to compare whether the same. In addition Equal items must have the same hashcode, and items of unequal are not necessarily. Elements with the same hashcode are not necessarily equal. The elements of different hashcode certainly ranged. The above rules can imagine the situation where equal items must be divided in the same box.16th, give me one of your most common runtimeexception.If you don't answer this question, the interviewer will think you have no pr

answer is that final can be used to modify classes, methods, variables, the final modified class represents the non-inheritable extension, the final variable is not modifiable, the final method is not overridable, and finally is a mechanism for Java to ensure that the key code must be executed. You can use try-catch-finally or try-finally to perform actions such as turning off JDBC connections, guaranteeing unlock locks, and so on. Finalize is a meth

115 Java Interview Questions and answers-ultimate list (I), 115 java Object-Oriented Programming (OOP) Java is a computer programming language that supports concurrency, class-based, and object-oriented. The advantages of object

Java Interview SummaryObject-oriented programming (OOP)Java is a computer programming language that supports concurrency, class-based, and object-oriented. The advantages of object-oriented software development are listed below: Code development is modular and easier to maintain and modify. Code reuse.

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 methods for multithreading? There are several

Java EE was originally in the browser and the client machine. At the time, many people questioned whether it was suitable for server-side development. Now, with the increase in Third-party support for the JAVA2 platform Enterprise version, Java is widely accepted as one of the preferred platforms for developing enterprise server-side solutions. The Java EE pla

Start learning Java today and learn to use the book as core java. Prior experience with C. Be prepared to record all the ideas, hard-to-understand, and important things that you learn about this book. I hope I can restudying it in retrospect. I also hope that I can insist on the whole process of learning this book to record.I want to put a ding in the universe.Ba

Message Service. Communication between applications. Including point-to-point and broadcast. JAVAMAIL: JAVA mail service. Provides mail storage and transmission functions. He is the core of the mail function in JAVA programming. EXCHANGE development kit in equivalent MS. JTA: JAVA