java interview programs for experienced

1. What is the difference between a process and a thread? A process is a standalone (self contained) operating environment that can be viewed as a program or an application. A thread is a task that executes in a process. The Java Runtime environment is a single process that contains different classes and programs. Threads can be called lightweight processes. Threads require fewer resources to create and res

JAVA multi-thread and concurrent basic Interview Q 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 interview perspective, but you should stil

Java Interview Essentials Summary Set2018-08-11Turn from: Java interview key points summary setArticle Directory1.Basic article1.1.Basic1.2.Collection1.3.Thread1.4. lock mechanism 2. core 2.1. Datastore 2.2. cache use 2.3. Message Queuing 3. frames 3.1.spring 3.2. netty 4. Micro services 4.1. MicroServi

Java interview questions Basic knowledge:1. 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 er

. The difference between a thread and a process: Dispatch: A thread acts as the basic unit of dispatch and allocation, and processes as the basic unit of resources. Concurrency: Not only can concurrent execution between processes, but also concurrent execution between multiple threads of the same process. Owning a resource: a process is an independent unit that owns resources, and threads do not own system resources, but can access resources that belong to the process.

enable TOMCAT7 can also be done automatically boot. It's almost over here, too much to look at.The final question is: Has there been any recent research into newer technologies?I said at that time is Docker, in fact this is not a new bar, 2013 time is very hot, but at that time even the manufacturers are still just stay in the research state, not to mention directly in the production environment used, the technology has not stabilized. Over the past two years, the gradual use of the company onl

Java interview knowledge points (most of them have been seen, but they are still very useful ~~ Turn to stay) It's a classic thing, and it's everywhere. First, write the original article:First, let's talk about the differences between final, finally, and finalize. Final is used to declare attributes. Methods and classes indicate that attributes are unchangeable, methods cannot be overwritten, and classes c

because they do not have any implementations.Code. After a class implements an interface, this class implements all the methods and attributes in the interface, and the attributes in the interface are under the default state are public static, and all methods are public by default. A class can implement multiple interfaces. 3. Advantages and principles of garbage collection. Two recovery mechanisms are also considered. A notable feature of Java is t

Translated by Peter Seibel/Hao peiqiang This article is an interview with Joshua Bloch, Chief Java architect of Google, by Peter Seibel, expert of commmon lisp, talking about what books programmers should read, how they can quickly get familiar with a new language, and why they choose programming languages is like choosing a bar. 　　 　　Seibel: How did you start programming? Bloch: I think this is because of

Today to share the Java focus on the wrong part of the point, but also the interview needs of all students to prepare, welcome to communicate correct.The main method in 1.java is a static method, that is, the code in the method is stored in a static storage area.2. Any static code block will be executed before the main method.Initialization order of 3.

done Tell me about your development process. How do you communicate with the team? How do you conduct code reviews Tell me about your understanding of technology and business. Tell me about the Exception you often encounter in the project. Tell me about the hardest bug you've encountered in the project, how to solve it. Tell me about your deepest impression in the project and how to solve it. What do you think is the problem with your project? Have you ever

JAVA engineer interview questionsZookeeper I went to a company for an interview today. I felt dizzy with my brains. I didn't make a few algorithm questions. The questions were relatively simple. I should have prepared myself, but the status was not good, after the interview, I felt quite dissatisfied. I still had to wa

in the heap instead of the stack, using the final decoration.46. What is GC? Why do you have a GC?GC is the meaning of garbage collection (Gabage Collection), memory processing is where programmers are prone to problems, forgetting or wrong memory recycling can cause program or system instability or even crashes, The GC functionality provided by Java can automatically monitor whether an object exceeds the scope to achieve the purpose of automatically

attention to the bottom of the implementation, the novice programmer as long as familiar with the basic use of methods, you can quickly develop on-line; but for senior programmers, the practice of internal strength is more important , such as algorithms, design patterns, underlying principles, and so on, only after these basic proficiency, in the development process can know its why, when problems can quickly locate the nature of the Problem.For Java

threads in sync. There are two ways to synchronize operations, method synchronization, and code block synchronization. When the Synchronized keyword is added to a method or block of code, it means that when a thread executes here, the object's lock is obtained first, and if the object is not locked, the thread adds a lock to the object and continues execution. While other threads are executing here, because the object is already locked, these threads will only wait for the lock on that object t

The topic comes from http://www.codeceo.com/article/201-java-interview-qa.html, the answer oneself search on the net, if have omission, welcome treatise. Learn together and make progress together. I. Java Fundamentals1. Why is the string class final? 2. HashMap The source code, the realization principle, the bottom structure.3. Tell me about some of the

in the heap instead of the stack, using the final decoration.46. What is GC? Why do you have a GC?GC is the meaning of garbage collection (Gabage Collection), memory processing is where programmers are prone to problems, forgetting or wrong memory recycling can cause program or system instability or even crashes, The GC functionality provided by Java can automatically monitor whether an object exceeds the scope to achieve the purpose of automatically

1. Question: What happens if the main method is declared private?Answer: Can compile normally, but will prompt "Main method is not public" when run.2. Question: What is the difference between a reference and a pass in Java?Answer: A pass-through refers to an address rather than the value itself, and a pass value is a copy of the passed value.3. Question: What else to consider if you want to override the Equals method of an object?Answer: Hashcode.4. Q

Alibaba JAVA Development interview FAQ Summary 4Three main features of java Encapsulation, inheritance, and PolymorphismDifferences between abstract classes and interfaces Java Abstract class:Classes modified using the abstract keyword are called abstract classes.Abstract methods are called abstract methods.Features:1.

Newcachedthreadpool creates multithreading.NewscheduledthreadpoolThis thread pool can specify a fixed number of threads to be executed periodically. For example, by scheduleatfixedrate or Schedulewithfixeddelay to specify the cycle time.PS: In addition to write timed tasks (if not Quartz framework), it is best to use this thread pool to do, because it can ensure that there is always a live thread.Recommended way to use ThreadpoolexecutorIn the case of Ali's