java interview programs for experienced

virtual machine level, describes how to improve the performance of Java programs by setting reasonable JVM parameters. The 6th chapter describes the tools for acquiring and monitoring programs or system performance indicators, including related troubleshooting tools.　　 "Java Program performance optimization: Make your

Java interview questions, java questions1. simple principles and applications of the Exception Handling Mechanism in C ++ or Java.When a JAVA program violates the JAVA Semantic Rules, the JAVA Virtual Machine will indicate an erro

not pass, because the Date class and String do not inherit or implement the relationship, so at compile time directly error, the instanceof operator left and right operand must have inheritance or implementation relationship, otherwise the compilation will fail. New Genericclass Back to top tip 19: Assertion is definitely not chickenIn defensive programming, it is common to use assertions (assertion) to make judgments about parameters and environments, to prevent

) development has no longer use the technology.3, what is cross-platform? What is the principle? JvmThe so-called cross-platform, refers to the Java language program written, once compiled, can be run on multiple system platforms.Implementation principle: Java program is running on the system platform through the Java Virtual machine, as long as the system can in

First, preface Only a bald head can become stronger. Review Front: Guangzhou three to find Java internship experience I wrote my interview experience and some of the questions I encountered during the interview (written and interview questions).I also spent a lot of time on the

JAVA multithreading and concurrent basic Interview Q A, java Multithreading Multithreading and concurrency are one of the questions that the interviewer prefers to ask during the Java technical interview. Here, most important questions are listed from the

1. Java Technology System 1.1 Java Programmer• Advanced FeaturesReflection, generics, annotation characters, auto-boxing and unpacking, enumeration classes, mutable parameters, variable return types, enhanced loops, static import• Core programmingIO, multi-threading, entity classes, collection classes, regular expressions, XML, and properties files• Graphic ProgrammingAWT (JAVA2D/JAVASOUND/JMF), Swing, SWT,

usually placed in a destructor, and the Java language does not have a destructor concept, but a finalize () method is introduced that, when the garbage collector is about to release the memory of a useless object, calls the object's Finalize () method first, so Developers do not need to be concerned about or need to know when the memory space occupied by an object is released.(6) The C + + language supports operator overloading, while the

Java interview questions, java questionsCommon Java interview questions: What if the main method is declared as private? Answer: It can be compiled normally, but the system prompts "the main method is not public" during running ".Q: What is the difference between passing ref

Java knowledge sorting and java knowledge interview 1. What are the features of object-oriented Inheritance, encapsulation, polymorphism, abstraction 2. What is the mechanism for implementing polymorphism in Java? Inheritance and interfaces 3. Types of exceptions in Java 3.1

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 correct?5. Is there any error in short s1 =

[Switch] Top 50 Java thread interview questions, javatop No matter whether you are a new programmer or veteran, you must have encountered thread problems during the interview. An important feature of Java is its built-in support for concurrency, which makes Java popular amo

In the process of dealing with some of the more progressive junior programmers, we summed up some of the experience to help qualified programmers as soon as possible, in general, more learning, more practice does not suffer. This article comes from an excerpt from the Java Web Lightweight Development Interview tutorial.1 which knowledge points can be postponed to understandIn the

Java Interview Essentials Summary set (partial answers)DescriptionIf you're lucky enough to see it,1, the overall framework of this article from @ Ali Liang's blog, summed up very good. Worthy of our study, its blog part of the answer.2, because of their limited ability, failed to achieve the mind that idea, is the first time to write their own, the second time book query3, the article will be put on GitHub

, algorithms, databases, Linux)1. Fence (cyclic), latching \ Descending lock (Countdownlatch)2. Multi-threading, 5 states, multithreaded method parameters (number of core thread pools, maximum number, timeout, time unit, deny server Assistant (handler, queue))3.hashmap source Code, parameters4. Complexity of space and time5. Two threads, Output 1, 2, respectively. How to implement 1,2,1,2,1,2, ... Swap output6. Two-point query, return subscript,7. Quick Sort8. databases, indexes,The difference b

Java Multithreading and Concurrency basics interview questions and AnswersOriginal link: http://ifeve.com/java-multi-threading-concurrency-interview-questions-with-answers/Multithreading and concurrency issues are among the questions that interviewers prefer to ask in a Java

time priority allocation. Url_hash assigns requests by accessing the URL results so that each URL is positioned to the same back-end server. WebService: is a cross-programming language and remote call technology across the operating system, that is, the server is written in Java, the client program can be written in other programming languages, and the client and server programs can be run on

each thread that stores data such as class information, constants, static variables, and code compiled by the immediate compiler that have been loaded by the virtual machine. The static domain and Chang (Runtime Constant Pool) are part of the method area.3. Memory space unique to each thread(1) program counter : Although many programs are multi-threaded, but because there is generally only one processor, so the current moment is only possible to exec

, avoid concurrency, as for code tuning, these need to accumulate, such as refactoring, factories, etc. Database tuning I'm not quite sure of that. Index and stored procedures, specific reference: MySQL Database tuning 21 best practices, other database tuning aspects look for yourselves. 5. Talk about your understanding of distributedA: Personal understanding: Distributed is to split a system/business into multiple subsystems/sub-business to work together, this process is called distributed, t

to face his phone rang, and then directly connected, he did not say he went to answer the phone, saying that he opened the door directly out ...Then I waited at the door for a few minutes, he did not stop the meaning, maybe he also know that he is not very technical, and then I was impatient, directly to the front desk to get rid of his sister. The front desk is also out of courtesy, let him go after the fight, who knows the 10 minutes did not stop the meaning of ...Finally do not know how long