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How do I set a JLabel's background color?
...is not painted, since the default of opaque is false for JLabel.
From the JavaDocs:
If true the component paints every pixel within its bounds. Otherwise, the component may not paint some or all of its pixels, allowing the underlying pixels to show through.
For more information, read the Jav...
How do I update the element at a certain position in an ArrayList? [duplicate]
...tring, then just do:
arrList.set(5, newValue);
This can be found in the java api reference here.
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Is it possible to iterate through JSONArray? [duplicate]
...or (int i = 0; i < arr.length(); i++) {
arr.getJSONObject(i);
}
For javax.json.JsonArray, you can do:
for (int i = 0; i < arr.size(); i++) {
arr.getJsonObject(i);
}
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How to preserve insertion order in HashMap? [duplicate]
...
according to java doc it says: This linked list defines the iteration ordering, which is normally the order in which keys were inserted into the map.¿¿¿¿¿ NORMALLY ????? what does it mean? the order insertion is not garantee....
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JUnit Testing Exceptions [duplicate]
I'm really new to java.
5 Answers
5
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How to auto-format code in Eclipse?
...
Another option is to go to Window->Preferences->Java->Editor->SaveActions and check the Format source code option. Then your source code will be formatted truly automatically each time you save it.
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functional interface that takes nothing and returns nothing [duplicate]
...; is that it may
* take any action whatsoever.
*
* @see java.lang.Thread#run()
*/
public abstract void run();
}
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千万别惹程序员 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...，可以爬墙去看)，淘宝上有卖的，价格在1万4左右。）
Java/C#是一把塑料餐刀，这说明，Java和C#语言是带虚拟机的，而且其语法和使用并不像C++那么复杂，其泛型编程可以有很多种玩法，而Java和C#的泛型编程是比较单一的。
Pyth...
MongoDB sort排序、index索引教程 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...likes" : 200 }
{ "_id" : ObjectId("56066549ade2f21f36b0313b"), "title" : "Java 教程", "description" : "Java 是由Sun Microsystems公司于1995年5月推出的高级程序设计语言。", "by" : "菜鸟教程", "url" : "https://www.tsingfun.com", "tags" : [ "java" ], "likes" : 150 }
{ "_id" : O...
App Inventor 2 OCR 图片文字识别全方案总结 · App Inventor 2 中文网
...使用现有OCR拓展
> NMD OCR
> OCRSpace
3、Java开源库写拓展，实现本地OCR识别
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1、使用百度api进行识别
使用百度api，每日免费调用100次，超过的话是收费的。根据相关文档、使用Web客...