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In Hibernate Validator 4.1+, what is the difference between @NotNull, @NotEmpty, and @NotBlank?
...int uses the @NotNull constraint above, and @Size whose definition differs based on the object but should be self explanitory.
Finally, the @NotBlank constraint is defined as:
@NotNull
@Constraint(validatedBy = {NotBlankValidator.class})
So this constraint also uses the @NotNull con...
C/C++ Struct vs Class
...ference is that where access modifiers (for member variables, methods, and base classes) in classes default to private, access modifiers in structs default to public.
However, in C, a struct is just an aggregate collection of (public) data, and has no other class-like features: no methods, no const...
How to produce a range with step n in bash? (generate a sequence of numbers with increments)
...a loop with a prescribed step value. It sounds simpler than all of the seq based answers, and is a clearer syntax than Bash4 brace expansion, and looks like it would allow for variables (I haven't tried that, but the syntax definitely suggests that).
– tobylaroni
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How to plot two histograms together in R?
...
Here is an even simpler solution using base graphics and alpha-blending (which does not work on all graphics devices):
set.seed(42)
p1 <- hist(rnorm(500,4)) # centered at 4
p2 <- hist(rnorm(500,6)) # centered at 6
plo...
What's the best way to iterate over two or more containers simultaneously
...over indices. But not with the classical for loop but instead with a range-based for loop over the indices:
for(unsigned i : indices(containerA)) {
containerA[i] = containerB[i];
}
indices is a simple wrapper function which returns a (lazily evaluated) range for the indices. Since the impleme...
Proper Repository Pattern Design in PHP?
...g to use the repository pattern in an MVC architecture with relational databases.
11 Answers
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How can I create tests in Android Studio?
Just downloaded Android Studio which is based off of the Intellij Idea.
12 Answers
12
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Scatter plot and Color mapping in Python
...e(100)
plt.scatter(x, y, c=t)
plt.show()
Here you are setting the color based on the index, t, which is just an array of [1, 2, ..., 100].
Perhaps an easier-to-understand example is the slightly simpler
import numpy as np
import matplotlib.pyplot as plt
x = np.arange(100)
y = x
t = x
plt.scat...
to drawRect or not to drawRect (when should one use drawRect/Core Graphics vs subviews/images and wh
...I was asking the same questions when my friend told me that my UIImageView based view hierarchy was going to slow down my game and make it terrible. I then proceeded to research everything I could find about whether to use UIViews, CoreGraphics, OpenGL or something 3rd party like Cocos2D. The cons...
Android: how to make an activity return results to the activity which calls it?
... // String returnedResult = data.getDataString();
}
}
}
EDIT based on your comment:
If you want to return three strings, then follow this by making use of key/value pairs with intent instead of using Uri.
Intent data = new Intent();
data.putExtra("streetkey","streetname");
data.putExt...