java programming questions and answers for written test

. LOG4J uses the log-level mechanism to write out the log output level in order of output levels from low to high.Answer: log4j is divided into off, FATAL, ERROR, WARN, INFO, DEBUG, all or the level you define. LOG4J recommends using only four levels, with the priority from high to low being ERROR, WARN, INFO, DEBUG. By defining the level here, you can control the switch to the appropriate level of log information in your application. For example, if the info level is defined here, the log infor

**Record some Java written exams, and interview with less certain questions:The difference between 1,string,stringbuffer,stringbuilder2,servlet is a single instance or multi-instance3,hashmap4,hibernate, the three object states of the session5,javascript closure, JS get form There are also sessions in 6,web, where the SessionID is allocated, the session expires when the browser is closed, and SessionID also

, the following about the IOC description error in the spring feature is ()A,ioc means that the relationship between programs is manipulated directly by the program code.B, the so-called "control reversal" refers to the transfer of control from the application code to the external container, that is, the control rightC,IOC the responsibility of controlling the creation into the framework, separating from the application codeD, when using the spring IOC container, only the objects required by the

Oracle Database Development interview questions, I did not do the test at that time, now with the original questions and answers, oracle Test 1, ID123567810111215 Table Name tt. use SQL to find the non-consecutive IDs in the ID column, for example, 4 which does not exist: --

Summary:The recent enterprise online written test, found that most of the enterprise's written test platform using the game Code network (although a lot of slots), and on-line programming needs to use scanner to read the input of the program, therefore, the author on the ach

A summary of common C ++ written examination questions circulated on the Internet for reference by students who need to find a job. Because the original article is long, the serialization form is used, it is estimated that the serialization will take about 10 days. If you have patience, please keep up with us. I believe we will surely reap some benefits. I would like to explain in advance that the

Answers are provided to the written examination questions of a large network company. 1. there is a forum where the post data is huge. please briefly describe how to improve the efficiency of searching for posts. In terms of programs, the page cache technology can be used. There is a forum on the front-end interface. there is a huge amount of post data. please br

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answer: 1-5 cdabb 6-10 DBDAB Recommended high-quality articles: Preparing for the 2014 soft exam! Recommendation of high-quality video tutorials (Comprehensive review + experience sharing + pre-test Sprint) Knowledge points of Network Management in 2014 computer soft examination [summary] Exercise questions and answers for the 2014 soft exam Network Administr

Test Questions // Write a function to flip the string. The flip method is as follows: "I am a student" is reversed to "student a am I" without any library function. It is said that this question was frequently used in a written test or interview. I just saw this question in my book, and I saw it again in

Concise answers to several java interview questions, concise java interview questions The difference between equal and = in java: The equal method is used to compare object references unless it is overwritten (such as String class

First step: Find all files in the/oldboy directory and its subdirectories that end with the extension. shFind all Files:[Email protected] oldboy]# find/oldboy/-type f/oldboy/t.sh/oldboy/test.sh/oldboy/test/del.sh/oldboy/alex.txt/ Oldboy/oldboy.txtFind all files ending with. sh[Email protected] oldboy]# find/oldboy/-type f-name "*.sh"/oldboy/t.sh/oldboy/test.sh/oldboy/test/del.sh13.2 Step Two: How to replac

:Char *p1; Long *p2; P1Char *)0x801000; P2Long *)0x810000; Excuse me p1+5= ; p2+5= ; Answer: 801005; 810014. Do not forget that this is a 16 binary number, P2 to add 20 to 16 binary is 1410:Summary of common operational order issues between pointers and * and + +intI=1;p rintf ("%d%d", i++,i++);//2 1printf"%d", i);//3intarr[]={6,7,8,9,Ten}; int*ptr=arr; * (ptr++) + =123;//First Count *ptr=*ptr+123, then ptr++; so arr[0]= 129; *p++=* (p++)?printf ("%d,%d", *ptr,*

Questions and answers about Python ProgrammingQ A introduction to Python Programming About a month ago, oschina.net and Chapter Hua jointly held an activity: OSC 51st master Q A-talk about those things in python to promote the book I wrote: Writing high-quality code: 91 suggestions for improving Python programs (Douban link ). In the process of answering the

C ++ programming thoughts (version 2) Chapter 1 C (notes, exercises, and answers) in C ++ (I) and answers to java programming thoughts I. Summarize the content of this chapter: 1. if the declared pointer is void *, it means that any type of address can indirectly reference t

times the for statement executes the loop body is () (1) 3 (2) 2 (3) 1 (4) 0 5. In the following options, the program that does not constitute an endless loop is () (1) int I = 100 While (1) { I = I0 + 1; If (I> 100) Break; } (2) (;;); (3) int K = 1000; Do { ++ K; } While (K gt; = 10000 ); (4) int S = 36; While (s); -- S; 　Answer 1. (2) 2. (2) 3. (1) 4. (3) 5. (3) Recommended high-quality articles Preparing for the 2014 soft exam high-quality video tutorials, comprehensive review + experien

"). Append ("World"). Append ("I love You"); This time S has more than one string to splice, it is supposed to be a number of objects generated, but the JVM will be an optimization, that is, only create an object, at this time it executes faster than the stringbuffer stitching. Look at this: String s2 = "Hello"; String s3 = "World"; String S4 = "I love You"; String S1 = s2 + s3 + S4; In this case, three more objects are created, resulting in a waste of memory space.

ensure that there is no mistake in the software iteration?A: On the one hand, there are some best practices, such as guaranteed return values of the same type, and a full unit test; The third is to use a newer version of Python, which already supports type declarations for parameters and return values. Q: What good library to use for Python's co-processA: Must be gevent. Q: Does Python have a mature tool chain like Ruby Community RVM, bun

Common Android test questions and Answers (detailed collation)1. Please describe the activity life cycle.Answer: as shown in. There are seven periodic functions, in order: OnCreate (), OnStart (), Onrestart (), Onresume (), OnPause (), OnStop (), OnDestroy ().OnCreate (): Called when an activity is created, set in the method, and provides access to any previously

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