icnd1 practice test questions

type variables? Volatile has two main functions: 1. Avoid command rearrangement 2. Visibility guarantees. For example, the JVM or JIT will reorder the statements for better performance, but the volatile type variable will not be reordered with other statements even if there are no synchronized blocks. Volatile provides happens-before guarantees that a thread's modifications can be visible to other threads. In some cases, volatile can also provide atomicity, such as reading 64-bit data type

View object in the activity. The OnDraw () method of the view is automatically called.2. Use multithreading and do not use double bufferingIn this case, the new thread needs to be opened, and the newly opened thread will not have access to the View object. Forced access will be error: android.view.viewroot$ calledfromwrongthreadexception:only theoriginal thread that created a view hierarchy can touch its views.At this point you need to create a subclass that inherits the Android.os.handler and

After the day before the blog, today continue to explain the 27 questions. Test Question address: http://www.eosgarden.com/en/articles/objc-quizz/take/31.Which of the following can be inherited?Which of the following can be inherited?Answer: Protocols,classes. Protocols and classesNote: Be aware that categories cannot be inherited.32.How Do you throw an exception?How do I throw an exception?Answer: @throw E

On the Internet saw three test development of the pen questions, the answer is in Python solution. This is the time to learn about PowerShell, practice:)1. Verify the mailbox format2. Get the suffix name of the URL3. Get the time of the previous day or the previous secondMy solution is:1 #Check Email Format2Write-host"Please input your email address"3 $email=read

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First, the array to weightYesterday, when the written test, found that the data type JS method with the less familiar, or usually practice less, looked at the elevation did not remember the notes. The methods in the array type and the methods in the string are mixed. The operations of the array are summarized as follows:An array is simply an array of elements to be traversed, added, deleted, modified, inser

and return the temporary array. Array.prototype.unique1 = function () {var res = [This[0]];for (var i = 1; i if (Res.indexof (this[i]) = =-1) {Res.push (This[i]);}}return res;}arr = [3,5,2,3,2,2,3,7];Console.log (Arr.unique1 ()); The second method is to create a new hash table and a temporary array, traverse the current array, see if there is a JSON object I , there, skip, none, then let the hash table in the value of the I key attribute is true, and push the value into the tempo

similarities and differences between JSP and servlet?JSP is the extension of servlet technology, is essentially a simple way of servlet, JSP more emphasis on the application of the appearance of expression, compiled is "class servlet." The main difference between Servlets and JSPs is that the application logic of the servlet is in the Java file and is completely detached from the HTML in the presentation layer, whereas the JSP case is that Java and HTML can be combined into a file with a. jsp e