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Rails has_many with alias name
... be able to refer to them as tasks as well:
class User < ActiveRecord::Base
alias_attribute :jobs, :tasks
has_many :tasks
end
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compareTo() vs. equals()
...o override hashcode when we override equals because if the class uses hash-based collections, including HashMap, HashSet, and Hashtable the class wont function properly
– varunthacker
Jul 6 '12 at 15:29
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在 App Inventor 2 中使用图像 · App Inventor 2 中文网
... an image much larger than the app requires.
Every image has a “size” based on its width and height in pixels. You can multiply these two numbers to get a sense of the amount of memory required for displaying the image.
App Inventor lets you get images (for example, from the Web) and impo...
How to return an array from JNI to Java?
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Based on the asked question, this is already explained in the first answer that how can we pass int[] via jobjectArray. But Here is an example how we can return a jobjectArray which contains lists of data. This can be helpful...
Could not reliably determine the server's fully qualified domain name
...hat httpd can not find a FQDN, so it might not work right to handle a name-based virtual host. So make sure the expected FQDN is registered in your DNS server, or manually add the entry in /etc/hosts which is prior to hitting DNS.
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java.nio.file.Path for a classpath resource
...oken the above code example. The JRE inconsistently returns the path /java.base/java/lang/Object.class for Object.class.getResource("Object.class") whereas it should be /modules/java.base/java/lang/Object.class. This can be fixed by prepending the missing /modules/ when the parent path is reported a...
Java Annotations
... run your tests, this method will be called and the test will pass or fail based on whether an IOException is thrown.
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When should I use the Visitor Design Pattern? [closed]
... a new feature, they would need to add that method to every feature in the base class. This is particularly hard when the base classes appear in a separate library, or are produced by a separate team.
(I have heard it argued that the Visitor pattern is in conflict with good OO practices, because it...
Mod in Java produces negative numbers [duplicate]
...er calculation on most CPUs. Or, if you want to conditionally add a value based on whether an int is negative or not, try (maybeNegative >> 31) ^ thingToMaybeAdd + thingToAddTo
– Scott Carey
Sep 28 '18 at 17:26
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How to use relative/absolute paths in css URLs?
...ts in the css. somethig like
.icon{
background-image:url('<?php echo BASE_IMAGE;?>icon.png');
}
and it's not a bad idea to make it dynamic because now i could compress it using YUI compressor without loosing the original format on my dev server.
Good Luck!
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