public boolean addAll(Collection<? extends E> c) { Object[] a = c.toArray(); int numNew = a.length; ensureCapacityInternal(size + numNew); Increments modCount System.arraycopy(a, 0, elementData, size, numNew); size += numNew...
problem description: a blog system is being developed that needs to achieve the top of an article, and then the foreground will display the article (or more than one) at the top. What I want is to add a new field to determine whether it is a top article...
how to set bean is not required messageSource this bean is not required, and the Spring container can be started when messageSource injection fails. Is there this option in Spring s xml configuration file, or is there any other way to solve th...
Which method of HIbernate is more appropriate to use in the SQL statement select name,sex from db, for example: public T findByID (ID id, I dbName) throws Exception; public List<T> findAll(I dbName) throws Exception; public List<T> findBy...
such as the question: 100 people grab 10 red packets, how to ensure that the red packets will not be snatched by the same one many times? This is the first interview question ...
such as the question: if you want to randomly query multiple pieces of data, which cannot be repeated each time, how to achieve it? ...
our company s system is an intranet system, and we have not paid attention to the problem of parallel ultra vires before. Recently, the company conducted a security test to issue this problem, that is, users can ultra vires access to other users or orde...
want to do a multi-image upload preview function, currently only achieve a single image upload preview deletion, modify on the original basis do not know where to start, Daniel help take a look. html: <div class="form-group"> ...
such as title: use Shiro to control that you will be blocked when you jump to another page without logging in saveRequestAndRedirectToLogin() . saveRequestAndRedirectToLogin() WebUtils.saveRequest(request); . what s wrong with this? [0 q...
-Xms -Xmx -Xmn these three parameters specify the size of jvm heap memory, so how to specify the overall memory size of jvm. is heap + stack + method area + program counter + local method stack where is the overall memory size specified and what is the...
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE generatorConfiguration PUBLIC "- mybatis.org DTD MyBatis Generator Configuration 1.0 EN" "http: mybatis.org dtd mybatis-generator-config_1_0....
what does this function mean? when reading api, its explanation is not very clear. ...
practice using the sun.misc.Unsafe class when simulating the tabAt method of ConcurrentHashMap. As shown in the following code, use arrayBaseOffset to get the offset address of the first element of the array, and why both arrays can get the element at t...
vue.js rookie, is trying to do a multi-image preview delete and upload function, has achieved a single image upload preview, deletion also encountered some problems, I hope Daniel guide the confusion, attach the html,vue.js code. main problem: when sel...
mybatis input parameter is a list of type integer if there is only a 0 in the list, do not Filter this property otherwise, this field in list ...
android cancels the status bar reservation and displays the status bar do you know how Android is implemented without mixed development? ...
the picture cannot be uploaded, just describe it: after last debugging-> then switch to the upper right to set a breakpoint in project mode-> then enter debug mode-> start debug- > jump to the pointer instead of the breakpoint. how to deal with it? ...
import java.io.IOException; import java.util.Properties; public class PropertyUtil { public static void main(String[] args) { Properties properties = new Properties(); try { properties.load(PropertyUtil.class.getClassLoade...
demand when querying the list of data in paging, I want to query the total number of items at the same time, but I think the following code is a little tedious, is there any easier way, or is there any third-party framework that can simplify logic l...
instances of the same name that implement the javabean specification are prohibited in the same domain (even if the classes of the instances are different), right? When searching in the < jsp:useBean > tag, if you encounter an instance that implements...
my requirement is: the Android side requests the background interface, and then the background interface makes the background management system page pop-up dialog box, how to achieve it? as shown in the figure, the background interface is written i...
when multiple people collaborate to develop a spring boot project, different developers may have different local server configurations for testing. For example, developer A s local database password is 123456 B the developer s local database password ...
Great God. I don t know if it is appropriate for me to write the title like this. In short, it means that our company s business is micro-service, and everyone calls each other to provide services to users. Therefore, according to the data flow, it wi...
it is feasible to introduce some api, of Amap into the project written by Amap and directly put it in html, but only if you want to reference him in the used component, is there any way to import it outside the chain <script type="text javascri...
command + option + L could you tell me how to make it recognize the symbol = >? Thank you. ...