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What does the red exclamation point icon in Eclipse mean?
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According to the documentation:
Decorates Java projects and working
sets that contain build path errors
In practice, I've found that a "build path error" may be caused by any number of reasons, depending on what plugins are active. Check the "Problems" view for ...
IntelliJ IDEA with Junit 4.7 “!!! JUnit version 3.8 or later expected:”
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my module is a java library module, so changing JRE to 1.8 java solved the issue.
Or, you can also do it globally via Module Settings > SDK Location > JDK, specifying Oracle's JDK 8 instead of Android SDK's copy.
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How do I send an HTML email?
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As per the Javadoc, the MimeMessage#setText() sets a default mime type of text/plain, while you need text/html. Rather use MimeMessage#setContent() instead.
message.setContent(someHtmlMessage, "text/html; charset=utf-8");
For additio...
What is the difference between Hibernate and Spring Data JPA
..., or any other JPA provider. A very interesting benefit of using Spring or Java EE is that you can control transaction boundaries declaratively using the @Transactional annotation.
Spring JDBC is much more lightweight, and it's intended for native querying, and if you only intend to use JDBC alone,...
Why do you need explicitly have the “self” argument in a Python method?
...e to quote Peters' Zen of Python. "Explicit is better than implicit."
In Java and C++, 'this.' can be deduced, except when you have variable names that make it impossible to deduce. So you sometimes need it and sometimes don't.
Python elects to make things like this explicit rather than based o...
Why is it bad practice to call System.gc()?
After answering a question about how to force-free objects in Java (the guy was clearing a 1.5GB HashMap) with System.gc() , I was told it's bad practice to call System.gc() manually, but the comments were not entirely convincing. In addition, no one seemed to dare to upvote, nor downvote my ...
When should a class be Comparable and/or Comparator?
...comparing itself with another object. The class itself must implements the java.lang.Comparable interface in order to be able to compare its instances.
Comparator
A comparator object is capable of comparing two different objects. The class is not comparing its instances, but some other class’s i...
For a boolean field, what is the naming convention for its getter/setter?
...ublic void setActive(boolean active){this.active = active;}
See Also
Java Programming/Java Beans
Code Conventions for the Java Programming Language
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BLE协议—广播和扫描 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...扩展广播包的最大长度为255字节。 数据区没用完的话，系统会在后面补0。
AD Stucture每个AD Stucture由 长度（1字节）、类型（1字节）、内容（多字节）三个部分组成 ， 长度指的是类型+内容字节数。
下列是部分常用的AD Stucture Ty...
Correct way to add external jars (lib/*.jar) to an IntelliJ IDEA project
When creating a new Java project in IntelliJ IDEA, the following directories and files are created:
9 Answers
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