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Why do I need to override the equals and hashCode methods in Java?
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Joshua Bloch says on Effective Java
You must override hashCode() in every class that overrides equals(). Failure to do so will result in a violation of the general contract for Object.hashCode(), which will prevent your class from functioning properly in conjunction with all...
Android and setting alpha for (image) view alpha
...e alternative is to use View.setAlpha(float) whose XML counterpart is android:alpha. It takes a range of 0.0 to 1.0 instead of 0 to 255. Use it e.g. like
<ImageView android:alpha="0.4">
However, the latter in available only since API level 11.
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How to delete all the rows in a table using Eloquent?
...del::truncate();
That drops all rows from the table without logging individual row deletions.
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Extract value of attribute node via XPath
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//Parent[@id='1']/Children/child/@name
Your original child[@name] means an element child which has an attribute name. You want child/@name.
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Handling a colon in an element ID in a CSS selector [duplicate]
JSF is setting the ID of an input field to search_form:expression . I need to specify some styling on that element, but that colon looks like the beginning of a pseudo-element to the browser so it gets marked invalid and ignored. Is there anyway to escape the colon or something?
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Android: android.content.res.Resources$NotFoundException: String resource ID #0x5
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I am wondering why Android Studio does not advice you. I had the same problem setting an int value into TextView.setText for error.
– bheatcoker
Apr 22 '16 at 10:08
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@RequestParam in Spring MVC handling optional parameters
...name and password request parameters as well. That's because, when you provide just the logout parameter, it actually expects for name and password as well as they are still mandatory.
It worked when you just gave name and password because logout wasn't a mandatory parameter thanks to required = fa...
how to override action bar back button in android?
...tivity back button in action bar, not in hard key back button. I have overriden the onBackPressed() method. It works with my emulator back button, but not with action bar back button.
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Ways to implement data versioning in MongoDB
...t contain a dictionary of time-stamped diffs. Something like this:
{
_id : "id of address book record",
changes : {
1234567 : { "city" : "Omaha", "state" : "Nebraska" },
1234568 : { "city" : "Kansas City", "state" : "Missouri" }
}
}
To make ...
Spring CrudRepository findByInventoryIds(List inventoryIdList) - equivalent to IN clause
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findByInventoryIdIn(List<Long> inventoryIdList) should do the trick.
The HTTP request parameter format would be like so:
Yes ?id=1,2,3
No ?id=1&id=2&id=3
The complete list of JPA repository keywords can be found in the cu...