java programming questions and answers for written test

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

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,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

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 component objects generate various

the application. 4, the level of competition is not true Different levels of shared data and execution of local computing will show a different level of competition, with different performance and scalability 5, the elimination of useless code The compiler may delete code that is meaningless or does not produce results or predictable results Make the results as unpredictable as possible Iv. Other test methodsCode

= executors.defaultthreadfactory ();p ublic static void Main (string[] args) {try {new Testingthreadfactory (). Testpoolexpansion ();} catch (Interruptedexception e) {//TODO auto-generated catch Blocke.printstacktrace ();}} @Overridepublic Thread Newthread (Runnable R) {//TODO auto-generated method Stubnumcreated.incrementandget (); return Factory.newthread (r);} public void Testpoolexpansion () throws interruptedexception {int max_size = 10; Testingthreadfactory threadfactory = new Testingthre

The first code runs the resultfunction: Sum from 1 to 5305The result of the second code runCode HostingThe result of the third code run(1) The name of the source file is Person.java(2) Generate 2 byte-code files, named Person.class and Xiti.classBecause I did not finish my first week of work, I did not complete the test task on time because I had a lot of time to play the code during the test, and I was fam