java quiz code

20172319 2018.04.11 "Java Programming Tutorial" 7th Week Classroom Quiz Program: Program design and data structure Class: 1723 Student: Tang Caiming Study No.: 20172319 Instructor: Wang Zhiqiang Date: 2018.04.11 Compulsory/elective: compulsory Directory Test content Test requirements Experimental steps Pre-preparation

Java.5. What are the different thread lifecycles?When we create a new thread in a Java program, its state is new. when we call the thread's start () method, the state is changed to Runnable. The thread scheduler allocates CPU time to threads in the Runnable thread pool and says their state changes to Running. Other thread states also have waiting,blocked and Dead. Read this article to learn more about the

system is consistent after the end of the transactionIsolated isolation: Things that are executed concurrently cannot see each other's middle stateDurable persistence: All changes made after the transaction is completed will be persisted, even if a catastrophic failure has occurred.58. What is data dirty read, Phantom Read, non-repeatable read?Dirty read: The rollback of a transaction is performed after reading to the modified but uncommitted transaction content. In other words, a dog forced to

Java.5. What are the different thread lifecycles?When we create a new thread in a Java program, its state is new. when we call the thread's start () method, the state is changed to Runnable. The thread scheduler allocates CPU time to threads in the Runnable thread pool and says their state changes to Running. Other thread states also have waiting,blocked and Dead. Read this article to learn more about the

through the collection using Iterators, the next () method of the iterator throws a Concurrentmodificationexception exception.Concurrent containers support concurrent traversal and concurrent updates.The main classes are Concurrenthashmap, copyonwritearraylist and Copyonwritearrayset, read this article to learn how to avoid concurrentmodificationexception.8. What is the Executors class?Executors provides some tool methods for the Executor,executorservice,scheduledexecutorservice,threadfactory a

Java.5. What are the different thread lifecycles?When we create a new thread in a Java program, its state is new. when we call the thread's start () method, the state is changed to Runnable. The thread scheduler allocates CPU time to threads in the Runnable thread pool and says their state changes to Running. Other thread states also have waiting,blocked and Dead. Read this article to learn more about the

, copyonwritearraylist and Copyonwritearrayset, read this article to learn how to avoid concurrentmodificationexception.8. What is the Executors class?Executors provides some tool methods for the Executor,executorservice,scheduledexecutorservice,threadfactory and callable classes.Executors can be used for convenient creation of thread pools9. Why is it that Concurrenthashmap is weak and consistent? And why is concurrentmodificationexception not reported when multiple threads modify Concurrenthas

do not need to use the Futuretask class, it becomes very useful when we intend to rewrite some methods of the future interface and keep the original base implementation. We can just inherit from it and rewrite the methods we need. Read the Java futuretask example to learn how to use it.7. What is the implementation of concurrent containers?Java collection classes are fast failures, which means that when a

Why can 1,java run across platforms? Please outline the principle.Since the code compiled by the Java program is not code that can be run directly by the hardware system, it is an "intermediate code"-bytecode. A different Java Vir

] = Integer.valueOf (String.valueOf (a[0] [i]));j + +; } } if (j = =2) Break ; } For (i =0;i2].length;i++) { if (a[2] [i] = = a[3] [i] a[2] [I]>= a[2] [I]122) {tongyi[2] = i; Break ; } }String jg=""; Switch (tongyi[0]) { Case1:JG ="MON"; Break ; Case2:JG ="TUE"; Break ; Case3:JG ="WED"; Break ; Case4:JG ="THU"; Break ; Case5:JG ="FRI"; Break ; Case6:JG ="SAT"; Break ; Case7:JG ="SUN"; Break ; }System.out.print (JG ); System. out.printf ( "%02d", tongyi[ 1]); System. out.printf (

1.RadioWhich of the following is not a version control system: A.git B.svn C.rsync D.cvs 2.Multi-SelectWhich of the following commands can be used to get a git repository: A.git Checkout B.git Fetch C. git clone D. git init 3.JudgingLike SVN, you can share your submitted code with other developers just by using git commit A.√ B. x Git pull does not just get the version of the rem

=======================================================The similarities and differences between Java and C + +:Same point: Java and C + + have similar syntax and control structuresDifferent points: Java has no preprocessor or file contains;No pointers, no global variables;No structures and unions;All primitive types (basic types) have a definite size;No operator

, ..., the direct superior number of the soldiers of N, number I of the soldier's direct superior number is less than I.Output formatOutputs an integer that represents the number of scenarios for sending out the Expendables. Because the number can be large, you only need to output the remainder of this number except 10007.Sample Input 131 1Sample Output 14Sample DescriptionThese four ways are:1. Select 1;2. Select 2;3. Select 3;4. Select 2, 3.Sample Input 271 1 2 2 3 3Sample Output 240Data size

requests B. We can debug the entire process of HTTP requests with Chrome's Debugging tools C. The request line consists of three parts, namely the request method, the resource path, the protocol version number D. The status line of the response has the HTTP protocol version number, status code, and a status description E.http 1.1 is the version of the HTTP protocol that is now widely used in practical applications 　2. Judgment (2

as follows:? 1 str.substring (M, N) + ""This creates an entirely new array of characters representing the new string. The method above sometimes makes the code faster because the garbage collector reclaims large unused strings, leaving only one substring.In Oracle JDK 7, SUBSTRING () creates a new character array without an existing array. The substring () Method in JDK 6 and JDK 7 shows the difference between JDK 6 and JDK 7 substring ().String vs S

while the Web app is running. They are shared by all requests in the session. All of the properties you set in HttpServletRequest, HttpServletResponse, and HttpSession will remain alive when the object in question survives. Thread SafetyEven so, you may be most concerned about thread safety. You should now learn that the Servlet and filter are shared by all requests. That is one of the advantages of Java, which allows multiple different thre

GuideThis article comes from StackOverflow's question and answer, discusses the working mechanism of Java servlet, how to instantiate, share variables and multithreading.Question: How does a servlet work? How does the Servlet instantiate, share variables, and multithreading?Suppose I have a large number Servlet of Web servers running. Servletthe context is obtained by transferring information between Servlet , and the session variable is set.Now, if t

]; } }define a student class Student, which contains three attribute names, age, and gender, creates three student objects to be stored in a ArrayList collection. A: Iterates through the set traversal output. B: Find the oldest student, let the name of the object become: Gourd Doll. 1ArraylistNewArraylist();2Stu arr1 =NewStu ();3Stu arr2 =NewStu ();4Stu Arr3 =NewStu ();5Arr1.name= "Wang Rongshen";6Arr1.age = 23;7Arr1.sex = "Male";8 Stu.add (arr1);9Arr2.name = "Zhang Rui";TenArr

1 /*2 returns the first n bits of the string and the first n bits of the returned integer3 */4 5#include 6 7UnsignedLongLeft (unsignedLongNumintn);8 Char* Left (Char* STR,intn);9 Ten using namespacestd; One A intMain () - { -UnsignedLongnum; the intN; -cout "Please enter an integer:"; -CIN >>num; -cout "Please enter the number of digits to intercept:"; +CIN >>N; -cout "before""bit is"Endl; + A Char* str =New Char( -); atcout "Please enter a string:"; -CIN >>str; -cout "Please enter the

Wrote a PHP random quiz verification Code, security personally think it is good. wangking717 wrote Security features One: 1. The generated content is not the final result, but a question-and-answer system that requires users to respond to the problem, with a more rigorous safety factor than traditional verification codes. 2. The colors, fonts, and positions of each number generated are random, so that i