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為什么java不要在foreach循環(huán)里進行元素的remove/add操作

選自《阿里巴巴JAVA開發(fā)手冊》 圖1代碼執(zhí)行情況是：解釋刪除1這個元素不會報錯，但是刪除2這個元素報錯了，這個情況如何解釋？

From [Javadiscussion group] 2017-04-18 10:54:42 0  8  1360

java - 可以先跳過struts2、hibernate即ssh，直接學spring、spring-mvc、mybatis（ssm）嗎

學完javaweb基礎(chǔ)學習階段（javase、servlet、jsp等等），現(xiàn)在學框架，可以先跳過struts2、hibernate即ssh，直接學spring、spring-mvc、mybatis（ssm）嗎？？？

From [Javadiscussion group] 2017-04-18 10:46:17 0  6  1360

java-ee - JAVA Non-static method cannot be referenced

Non-static method cannot be referenced from a static context {code...} I wanted to group operationInfos and th...

From [Javadiscussion group] 2017-07-03 11:43:19 0  2  1359

How to get the user client mac address in java

How to get the user's client MAC address in java. I have tried many methods to get the server MAC address, and...

From [Javadiscussion group] 2017-05-27 17:41:02 0  3  1356

java - 微信支付寶支付開發(fā)用iframe成功后怎么跳出iframe。

微信內(nèi)用支付寶支付被屏蔽了url，我在jsp中用iframe，<iframe id="iframe1" src="${redirectURL }" width=&qu...

From [Javadiscussion group] 2017-04-17 17:10:20 0  4  1356

java - zookeeper always disconnects and reconnects?

Deploying zookeeper on the spring boot project to register the service was normal at first. However, it will b...

From [Javadiscussion group] 2017-07-03 11:43:21 0  2  1354

java - springMVC配置的controller無法返回jsp文件

當啟動完tomcat后，它首先展示的是index.jsp ，當我輸入http://localhost:8080/Spring_no_2/時，出現(xiàn) {代碼...} 根據(jù)spring in action中的springMVC...

From [Javadiscussion group] 2017-04-18 10:54:02 0  4  1353

java - Spring Session, Spring Security How to not automatically create a session on a URL that is intercepted without permission?

I made an API server for mobile calls, used Spring Session to connect Redis to share sessions between multiple...

From [Javadiscussion group] 2017-06-28 09:23:34 0  1  1352

java swing布局嵌套

小菜一枚，剛接觸Java，想寫個注冊界面，但卻遇到一個奇怪問題：代碼如下： {代碼...} 主要思路：一個主Jpanel，邊界布局5個子Panel，東西南北中最后將主Panel加入Container中，但最后執(zhí)行結(jié)果，F(xiàn)...

From [Javadiscussion group] 2017-04-17 17:54:45 0  2  1352

java - Spring boot 配置spring.jackson.serialization-inclusion無效

在學習spring boot時配置Jackson遇到一個配置spring.jackson.serialization-inclusion無效，配置在一起的date-format是有效的，查了一大圈資料，感覺應該可以才對！...

From [Javadiscussion group] 2017-04-18 10:47:33 0  1  1351

android - Error:Execution failed for task ':app:compileDebugJavaWithJavac'

今天在android studio上有碰到了一個問題，不知道是不是圖片的問題還是什么？我把幾張圖片丟到mipmap-xhdpi里面，圖片的名字 就創(chuàng)建一個數(shù)組，把圖片裝起來 {代碼...} 這段代碼在Android st...

From [Javadiscussion group] 2017-04-18 10:21:54 0  0  1351

java - lucene How to search for a keyword, and the keyword that is exactly the same as this one will be ranked first

For example, if you search for the keyword 'toluene', the ones with the title "toluene" will be rank...

From [Javadiscussion group] 2017-07-05 10:02:21 0  1  1346

java - Which expert has implemented the attendance and punch-in positioning function? Please give me some guidance

Which expert has implemented the attendance and punch-in positioning function? Please give me some advice? It ...

From [Javadiscussion group] 2017-05-27 17:40:46 0  1  1346

x=3 y=4 I don't understand

Why x<=y is true

From [Javadiscussion group] 2021-09-27 19:34:48 0  1  1344

java-ee - JAVA的注解@Api和@ApiOperation的作用是什么，怎么跳轉(zhuǎn)頁面的

如圖，在springMVC中，@requestmapping是起到了接受view層的url，再根據(jù)requestmapping的value來確認的那個方法的作用，那么@api和@ApiOperation的作用是什么呢？r...

From [Javadiscussion group] 2017-04-18 10:54:15 0  1  1343