java programming test questions and answers

In the MU class network when learning to encounter such a Java programming exercises, just to learn the basic knowledge of Java to check:According to what you have learned, write a Java program that achieves the top three requirements for output test scores: 1

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 achievements of the ancestors of scanner did a new, detailed summary. We know that Java.util.

-VERBOSE:GC. Ensuring that garbage collection executes multiple times during the execution of a tester can fully reflect the overhead of memory allocation and garbage collection during run time. 2. Dynamic compilation You can have the test program run long enough to prevent dynamic compilation from deviating from the test results. Set-xx:+printcompilation in hotspot to output a piece o

again the quality of the translation of the book Under the Groove.12.2 Performance Test (p215)12.2.1 added chronograph function in Puttaketest (p215)Record the time of the entire run, divided by the amount of the operand, to get the run time of each operation. Use a fence action to measure start and end times:Honestly this Part I see Foggy, do not know is not the reason of translation (in the Frying pan ...), two week head prepare to take the English

java.util.concurrent.atomic.atomicinteger;import static org.junit.Assert.*; Import Org.junit.test;public class Puttaketest {private static final executorservice pool = Executors.newcachedthreadpool ();p rivate final Atomicinteger putsum = new Atomicinteger (0);p rivate final Atomicinteger Takesum = new Atomicinteger (0);p rivate final cyclicbarrier barrier;private final boundedbufferThis test should be run on a multiprocessor system. To maximize the

[Java concurrent programming] 3. DelayQueue Application Scenario, multi-examinee test, javadelayqueue This scenario comes from: http://www.cnblogs.com/sunzhenchao/p/3515085.html. Simulate the day of a test. The test time is 120 minutes. You can submit the exam only 30 minute

I personally think that the ultimate test in Java programming is to master and use the classloader mechanism flexibly, especially in complex systems, such as dynamic class loading, reflect, EJB, and AOP. Class. forname ()And thread. currentthread (). getcontextclassloader ())Is it the same? In many articles, the two are considered the same. For example, an artic

Title: Write a function, enter n, and find the nth of the Fibonacci Sequence.1 packagesolution;2 3 /**4 * Sword Point offer question 9: Fibonacci sequence5 * Title: Write a function, enter n, and find the nth of the Fibonacci Sequence. 6 * 0, n=17 * The Fibonacci sequence is defined as follows: f (n) = 1, n=28 * F (n-1) +f (n-2), n>29 * @authorGLTen * one */ a public classNo9fibonacci { - - public Static voidmain (string[] Args) { theSystem.out.println (the Value of the 4th Xiang Feip

Java concurrent programming test (3)Generate more alternate operations Because errors in concurrent code are generally low-probability events, you need to execute these errors multiple times during testing. However, some methods can increase the probability of discovering these errors, as mentioned above, in a multi-processor system, if the number of processors i

} the /*************extends**********************/ - Wu - Public classTestmemo { About $ Static intAddintAintb//The reentry of a function - { - return(A +b); - } A + Static intAddintAintBintC//The reentry of a function the { - return(a+b+c); $ } the the Static DoubleAddDoubleADoubleb//The reentry of a function the { the returnA +b; - } in Public Static voidMain (string[] args)//The reentry of a function the {

,account to,int amount) {from.setbalance (from.getbalance ()-amount ); if (Random.nextint (>threshold) {Thread.yield ();} To.setbalance (To.getbalance () +amount);}Performance TestingPerformance testing should conform to the current application scenario, ideally reflecting the actual usage of the object being tested in the application.The second goal is to adjust the various limits based on experience values, such as the number of threads, cache capacity, and so on, which are dependent on the pl

Programming | programs | data This is written in the test program that is used in the back datagram program, which includes a set of custom events, a Java bean component that can scroll through the display image. In object-oriented program design, event messages are the basic means of communication between objects. In a graphical user interface program, GUI compo