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Uses for the Java Void Reference Type?
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Before generics, it was created for the reflection API, to hold TYPE returned by Method.getReturnType() for a void method, corresponding to the other primitive type classes.
EDIT: From the JavaDoc of Void: "The Void class is an uninstantiable placeholder class to hold a refe...
How to set a default value for a datetime column to record creation time in a migration?
... has fields named created_at/created_on or updated_at/updated_on. Source - api.rubyonrails.org
You don't need to do anything else except to have that column.
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How can I tell if I'm running in 64-bit JVM or 32-bit JVM (from within a program)?
...e, how do I distinguish between 32 and 64-bit operation?
There's no public API that allows you to distinguish between 32 and 64-bit operation. Think of 64-bit as just another platform in the write once, run anywhere tradition. However, if you'd like to write code which is platform specific (shame on...
How to smooth a curve in the right way?
...models library:
import numpy as np
import pylab as plt
import statsmodels.api as sm
x = np.linspace(0,2*np.pi,100)
y = np.sin(x) + np.random.random(100) * 0.2
lowess = sm.nonparametric.lowess(y, x, frac=0.1)
plt.plot(x, y, '+')
plt.plot(lowess[:, 0], lowess[:, 1])
plt.show()
Finally, if you kno...
How to detect responsive breakpoints of Twitter Bootstrap 3 using JavaScript?
...ion is still an experimental feature: developer.mozilla.org/en-US/docs/Web/API/DeviceOrientationEvent I suggest you to use .on('resize')
– mtt
Sep 2 '13 at 15:56
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Assigning default value while creating migration file
...s_count, :integer, :null => false, :default => 0
... and read Rails API
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从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...，关于推荐算法的详细介绍，请参考文章：Mahout推荐算法API详解
7. 创建自己的推荐引擎构造器
有了上面的知识，我就清楚地知道了Mahout推荐引擎的原理和使用，我们就可以写一个自己的构造器，通过“策略模式”实现，算法...
How do I save a String to a text file using Java?
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Take a look at the Java File API
a quick example:
try (PrintStream out = new PrintStream(new FileOutputStream("filename.txt"))) {
out.print(text);
}
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Access index of the parent ng-repeat from child ng-repeat
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According to ng-repeat docs http://docs.angularjs.org/api/ng.directive:ngRepeat, you can store the key or array index in the variable of your choice. (indexVar, valueVar) in values
so you can write
<div ng-repeat="(fIndex, f) in foos">
<div>
<div ng-repeat...
Differences between C++ string == and compare()?
...rmance-wise in your case to use the equality operator.
Longer answer: The API provides a method to check for string equality and a method to check string ordering. You want string equality, so use the equality operator (so that your expectations and those of the library implementors align.) If perf...