java interview preparation plan

= mysql_query("SELECT * FROM user WHERE country = ‘China‘"); if0) { ... } // 有效率的： $r = mysql_query("SELECT 1 FROM user WHERE country = ‘China‘ LIMIT 1"); if0) { ... } 4. Jianjian Index for search wordsRefer to Java interview Preparation 15: Database--Index 5. Use a fairly typed example in the Join table and index itIf your application has many join que

Thank you for attending our interview:　　The following is a summary of some pre-interview preparation and technical reference questions, hoping to help you.First, you need to prepare a job-related self-introduction, including the following:1. Several years of Java development experience, probably summarized under what t

Today we will be divided into four parts to talk about this problem, because I am a Java origin, so about the main language problems are related to Java, other language students can selectively ignore. In addition, the interview when the general interviewer's problems are closely linked, gradually in-depth, this point in the following can be more clearly felt.1,

generation object will replicate multiple times in the Survivor area, which can increase the lifetime of the object's younger generations, increasing the probability that it will be recycled in the younger generation. The parameter is valid only for serial GC.-xx:pretenuresizethreshold object more than how large is directly in the old generation to allocate 0 units of bytes The Cenozoic adopt parallel scavenge GC When invalid another case is a large array object that is allocated directly in th

through the HashMap bottom to achieve, but is HashMap value is all assigned to a constant object object, internal additions and deletions and other methods are directly called HashMap method, so do not repeat, and so on, such as HashMap in-depth analysis. private transient hashmap map; private static final object PRESENT = new object ( ); public boolean add (e e) { return map.put (E, PRESENT) ==null ; public boolean remove (Object o) { return map.remove (o) ==present;

a behavior, once the behavior changes, there is no need to modify many classes, just modify this behavior. AOP is this decentralized programming approach that encapsulates "focus" in "facets"2) control reversal IOC (inversion of control) controls refers to dependencies between program-related classes. In traditional conceptual design, it is usually the caller who creates an instance of the callee, in Spring, the work of creating the callee is no longer done by the caller, but by the The Spring

In Java, exceptions are classified as checked exceptions, and run-time exceptions. Both are in the exception class hierarchy. This type of easy-to-choose quiz did you master the exception class and know which exception classes must be capturedThe following figure shows the inheritance relationship of the Java exception class.Figure 1The pink is the checked exception (checked exceptions), which must be captu

framework, you'll think of Collectoin, and you'll answer arraylist\hashmap\hashset, and you'll talk about their differences. If more in-depth, hashmap principle, For-each principle and copyonwritearraylist, arrayblockingqueue and chat to these two classes, And then we'll talk about the problem under the java.util.concurrent bag.1.Collectoin Set Frame2.arraylist\hashmap\hashset differences3.HashMap principleRefer to the following two links, as long as you understand should be no problem, simply

filtering, such as the study of teamwork and communication skills, which should not be a problem for everyone. So in this article, we take the Java back-end advanced development as an example to tell the preparation point of the interview. The method is generic, and so can other students in other directions. ------------------------------------------------------

Interview preparation series 03 ---- Summary of Binary Tree questions in the interview, 03 ---- Binary Tree Interview preparation series 03 ---- Summary of Binary Tree questions in the interview This article is the first article i

Interview preparation series 03 ---- Summary of Binary Tree questions in the interview Interview preparation series 03 ---- Summary of Binary Tree questions in the interview This article is the first article in the

technical, it is difficult to manage the team, and not very good to do technology cost assessment. Of course, can be changed to do other things, after all, life is so long, if they do not like to do development, do not compete with bugs. 2. Long-term preparation-dry goods if you're in a position where you've decided not to do the technology, skip the rest of the section, and if you continue with the technology, this will be the dry goods for self-im

next time to prepare for the same problem.② extrapolate, go home to learn quickly, preferably through hands-on practice, through the running code to understand the relevant knowledge points.③ find out why, for example, the job requires project experience, the project experience you describe is ultimately considered a non-commercial project, then you need to update the project description, the next interview, you have to change the rhetoric, to find w

Summary of Java back-end development interview questions of major companies, and java back-end interview questions ThreadLocal (thread variable copy) Synchronized implements Memory sharing. ThreadLocal maintains a local variable for each thread. It uses space for time, which is used for data isolation between threads

Summarize the Java Background Development interview questions and the java Background interview questions. Jing er has been summing up some interview questions recently, because he must take everything seriously. The same is true for the

importantly, to have a certain database tuning capabilities, such as the reasonable creation of the table structure, to correctly create the index, but also through the use of indexes to reasonably optimize database performance, through the execution plan to analyze and optimize SQL.Because the tuning techniques for various data sheets are not necessarily consistent, advanced programmers are better able to master tuning techniques for multiple databa

interview to do the test session, never cheat. 6. Palm Grip of top tech pointsIn fact, this is an additional item, if the above points have passed the interview assessment, then this point will become your absolute highlight. First of all, you should first understand the current hot technology, and then through analysis of the position you apply, to see what might be involved in the hot technology, and

This article is in the study summary, welcome reprint but please indicate the origin: http://blog.csdn.net/pistolove/article/details/46753275 Preface Plan to change a job, nearly one months interviewed a lot of companies, the following will be some interview experience and thinking to share. Another school recruit is about to start, for students in the school to provide some experience for reference, hopi

synchronization solutions The system architecture of your project, talk about the overall implementation Usage Scenarios for message queues The difference between ActiveMQ, RABBITMQ and Kafka JVM memory allocation policies and timing of garbage collection JVM garbage collection policies and the actual lifecycle of objects The above content for the recent interview summary. Subsequent updates will continue if new content is available. Preface