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, which is used for medium-sized and large-scale data applications. The serial collector is sufficient for most small applications, which require about 100M of memory on modern processors.41. In Java, when can objects be garbage collected?This object can be recycled when the object becomes inaccessible to applications that currently use the object.Is there a garbage collection in the permanent generation of 42.JVM?Garbage collection does not occur in a permanent generation, and if it is permanen

applications. The serial collector is sufficient for most small applications, which require about 100M of memory on modern processors.41. In Java, when can objects be garbage collected?This object can be recycled when the object becomes inaccessible to applications that currently use the object.Is there a garbage collection in the permanent generation of 42.JVM?Garbage collection does not occur in a permanent generation, and if it is permanently full or exceeds the threshold, a full GC is trigg

, 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 understand 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

Beg for the answers to these 10 questions! All participants are rewarded! The 10 are clearly stated at least 90 points ...... (This is sincere !) Uncle comeonAV8D! (It's really hard to pass a broken picture) back to the truth. this is a Post posted by someone else, but I really want to know the answer to these questions (the clearer the better), so I am sending i

Linux is vast, so that people can always submit different content each time. Our work of The-Tecmint-Team is to provide some unique content for our readers, which is not only useful for their career, but also increases their knowledge. Here, we will try this label: interview Linux is vast, so that people can always submit different content each time. Our "The-Tecmint-Team" job is to provide some unique content for our readers, which is not only useful for their career, but also increases their k

Php interview questions and answers $ Img = file_get_contents ('http: // www.baidu.com/img/baidu_logo.gif '); File_put_contents('1.gif ', $ img ); Echo ''; ?> 3, Function is_gfriend ($ na, $ nb) { $ Random1 = rand (1/5); // calculate their fate $ Random2 = rand (1, 5 ); If ($ random1 ==$ random2) Retu

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 collection is changed and a thread iterates through the collection using Iterators, the next () method of the iterator throws a Concurrentmodificationexception exception.Concurrent containers support concurrent traversal

solves this problem for us. After the online pool submits the callable task, a future object is returned, using which we can know the status of the callable task and get the result of the execution callable returned. The future provides a get () method so that we can wait for callable to end and get its execution results.Read this article to learn more about the callable,future example. 6. What is Futuretask?Futuretask is a fundamental implementation of the future, and we can use it with execut

Answers to questions about python Regular Expressions and python Regular Expressions Three questions about python Regular Expressions: 1. Remove tags from the following html files and only display text information. Use the sub method in the python Regular Expression re module to replace the tag with an empty string. The Code is as follows: #-*-Coding: UTF-8-*-i

questions equal to the opening, often is the beginning of a series of questions, so be sure to truthfully according to their own circumstances to answer.1 What are the advantages of using block and using delegate to complete the delegation mode?The first thing to understand is the delegate mode, which is used extensively in iOS, which is an object adapter in the adapter pattern in design mode, and OBJECTIV

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 collection is changed and a thread iterates 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 Copyon

Now a lot of network marketing, will question and answer as a means of promotion, began to slowly some people began to focus on the question and answer marketing, to do a good job, can also have a good ranking and business opportunities Oh, and the author some time ago added a group, inside more systematic understanding how to do questions and answers, how to do know it, A number of methods have been used s

causes seg-fault or crashes.10. Process that will change its nameQ: Can you write a program that changes the name of your process at run time?Answer: see this code:#include 11. Return the address of the local variableQ: Is there a problem with the following code? If so, how do I change it?#include A: Although the above program can sometimes work correctly, there are serious vulnerabilities in "Inc". This function returns the address of the local variable. Because the life cycle of the local var

during logon?Q: In terms of brute-force rate, the virtual terminal of a fool seems to have only a single weapon but not anything else. How can I modify it?Q: How do I modify the role name, attributes, and other information related to the role in the created account?Q: I don't want to know so much about it. I don't want to install linux. Is there any silly operation that can be set up successfully? For answers to all the above

33 common php questions and answers 1. in PHP, the name of the current script (excluding the path and query string) is recorded in the predefined variable (1), and the URL linked to the current page is recorded in the predefined variable (2). The code is as follows:A: echo $ _ SERVER ['php _ SELF ']; echo $ _ SERVER ["HTTP_REFERER"];2. the execution segment will be output (3 ). The code is as follo

%, does not meet the demand;(3) memory page Exchange Rate page IN/S average of 98.8%, more than 80%, does not meet the demand.Question 4 (5 points)This paper examines whether the test index is reasonable, and the engineer's preliminary judgment on the bottleneck of the system.The three bottlenecks that are most likely to exist are listed below.Business success rate (not up to 100%), Application Memory memory page exchange rate (greater than 80), Database server CPU utilization (greater than 85%)

general ApplicationContext because it handles the subject and finds the associated servlet.67. What is the controller of the Spring MVC framework? The controller provides an access to the application's behavior, which is typically implemented through the service interface. The controller parses the user input and translates it into a model that is presented to the user by the view. Spring implements a control layer in a very abstract way, allowing the user to create multiple-purpose controllers

Core Java Questions and Answers (1-33), answers1-33Preface Http://www.journaldev.com/2366/core-java-interview-questions-and-answers.What are the important features of Java 8? Java 8 was released in March 2014, which is very common in Java interviews. If you can answer this question clearly, you are not out and would like to learn the latest technologies. Java 8 i

corresponding action, while the user's data to fill the corresponding actionform, and then the Actionform is distributed to action for processing.3.Action automatically calls the Excute method, in which the action takes the user-filled data from the Actionform and invokes the model (JavaBean) for processing, and then displays the results of the processing in a different view (JSP page)struts-config.xml:struts 's configuration file .It says that each user's request is handled and forwarded throu

) Select the correct collection type as needed. For example, if you specify a size, we will choose an array instead of a ArrayList. If we want to traverse a map in order of insertion, we need to use TreeMap. If we don't want to repeat, we should use set.(2) Some collection classes allow you to specify the initial capacity, so if we can estimate the number of stored elements, we could use it to avoid re-hashing or resizing.(3) programming based on interfaces, rather than implementation-based prog