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Java multithreading interview questions Induction1. What are the implementation methods for multithreading? The following example shows the thread synchronization.
(1) Java multithreading has two implementation methods: Inheriting the Thread class and implementing the Runnable interface. Thread implements the Runnable
, and future to implement threads with return resultsThe Executorservice, callable, and future three interfaces are actually executor frameworks. The thread that returns the result is a new feature introduced in the JDK1.5, and with this feature it is no longer necessary to get the return value. And it can be flawed if it is achieved.A task that can return a value must implement the callable interface. Similarly, a task without a return value must implement the Runnable interface.After performin
As a Java programmer who is often asked in an interview, let me summarize some of the questions that I often don't ask.
The difference between 1.HashMap and Hashtable
Often asked. Both are classes of the map interface, which enable you to map a unique key to a specific value.
HashMap class is not sorted and can have a null key and multiple nul
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
need to lay the foundation, the IDE select one to understand.2. Study the idea of Java programming"Thinking in Java" This book is the Great God highly recommended books, since the great God recommended, we might as well study it.It does not guarantee that you are out of the new ranks, but will lead you to the path of master.3. Learning: HTML, CSS, JavaScript, JQuery, BootstrapIn addition to learning
Do not write any scopes (that is, access rights) represent friendlyPublic, the largest, the largest scope, within the class, the same package, descendants class, other package can be accessedProtected protection, can be accessed within the class, the same package, descendant classes, but other package cannot accessFriendly friendly, within the class, the same package can be accessed, descendant class, other package cannot accessPrivate, minimal permissions, minimal scope, access within the class
JAVA basics: My personal object-oriented program view-Linux general technology-Linux programming and kernel information. The following is a detailed description. 1) some misunderstandings about the object-oriented concept
"Object
Java interview questions: Implementation of stacks and queues
During the interview, stacks and queues are often checked in pairs. This article includes the following stack and queue test content:
1) stack Creation
2) create a queue
3) Two stacks implement one queue
4) two queues implement one stack
5) design the stack
-threaded access to shared resources, due to improper access, usually a thread locked a resource A, but also want to lock resource B, and in another thread, the lock resource B, but also to lock resource A to complete its own operations, two threads want the other's resources, Instead of releasing their own resources, two of threads are waiting for a situation that cannot be performed.Java Network Programming approximate process:UDP programmingSend side:1, create the Socket
Translation Links: http://www.codeceo.com/article/java-hashmap-value-sort.htmlThe English version: How to Sort HashMap Based on the Values in JavaTranslation Author: Code Rural network – Xiao Feng
HashMap in Java is a data structure for storing "key" and "value" information pairs. Unlike array, ArrayList, and linkedlists, it does not maintain the order in which elements are inserted.
Therefore, sorting hash
Analysis of Java interview questions and prevention of SQL injection, semi QL
This article focuses on a common question in the Java interview questions, how to judge and prevent SQL Injection problems. The details are as follows.
Difference between Forward and Redirect in common JAVA interview questions, forwardredirect
The user sends an HTTP request to the server, which may be returned to the user after being processed by multiple information resources. Each information resource uses the request forwarding mechanism to forward requests to each other, however, the user does not feel reque
Test your Java basic test questions:
This is a few interview questions I designed. The requirement is that there should be as few questions as possible and they can be completed within five minutes, but it can basically reflect the level of knowledge of the interviewer. So I
process and data. Data access can only be performed through the defined interface. Object-oriented computing begins with the basic concept that the real world can be depicted as a series of completely autonomous and encapsulated objects that access other objects through a protected interface.
4. Polymorphism:
Polymorphism allows different types of objects to respond to the same message. Polymorphism includ
The difference between object-oriented and process-oriented 1. Compared with object-oriented programming, often is the process-oriented programming idea, in fact, I understand that the two do not conflict, because the
picture suffix 2, how to suffix is tampered with, then each file has a magic digital file upload-magic number5, the principle and implementation of Message Queuing Answer: 1, Message Queuing Principle 2, comprehensible message queue ActiveMQVi. Database Aspects1. The MySQL query field area is not case-sensitive?Answer: Do not differentiate, even if the value is not differentiated (I asked at the time, the area of the application of the size of the meaning of what, the interviewer did not say)2,
process and data. Data access can only be performed through the defined interface. Object-oriented computing begins with the basic concept that the real world can be depicted as a series of completely autonomous and encapsulated objects that access other objects through a protected interface.
4. Polymorphism:
Polymorphism allows different types of objects to respond to the same message. Polymorphism includ
This article for the author in the learning process according to teacher's guidance to organize themselves.
1. JDK, JRE, JVM
①jdk:java Development Kit Java Development Kit
②jre:java Runtime Environment Java Runtime Environment
③jvm:java Virtual Machine Java VM
2, briefly describe the process of compiling and running Java
multithreaded programs, multiple threads are executed concurrently to improve the efficiency of the program, and the CPU does not go idle because a thread needs to wait for resources. Multiple threads share heap memory, so creating multiple threads to perform some tasks is better than creating multiple processes. For example, Servlets is better than CGI because Servlets supports multithreading and CGI does not support it.How does the volatile keyword work in
returned by the constructor equals 6
Similar to normal methods, the this prefix can be omitted most of the time when accessing other member variables and methods in the constructor.However, if the constructor has a local variable with the same name as the member variable and must access the overridden member variable in the constructor, the this prefix must be used.
When this is used as the default reference for an object, the program can acc
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