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How to sort ArrayList in decreasing order?
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Java 8
well doing this in java 8 is so much fun and easier
Collections.sort(variants,(a,b)->a.compareTo(b));
Collections.reverse(variants);
Lambda expressions rock here!!!
in case you needed a more than one line logic for comparing a and b you could write it li...
JUnit Testing Exceptions [duplicate]
...xample == null) {
throw new NullPointerException();
}
//do fun things with valid example here
}
Then, when you run this JUnit test you will get a green bar:
@Test(expected = NullPointerException.class)
public void constructorShouldThrowNullPointerException() {
Example example ...
print memory address of Python variable [duplicate]
...4
print hex(id(x))
Gave me:
0x9cf10c
Which is what you want, right?
(Fun fact, binding two variables to the same int may result in the same memory address being used.)
Try:
x = 4
y = 4
w = 9999
v = 9999
a = 12345678
b = 12345678
print hex(id(x))
print hex(id(y))
print hex(id(w))
print hex(id(...
Remove a prefix from a string [duplicate]
...
Cool! Note: the behavior of the new function is exactly as in this answer (returning the string unchanged if it does not start with prefix)
– Elazar
May 27 at 23:50
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boost自定义composite_key_compare比较函数 - C/C++ - 清泛网 - 专注C/C++及内核技术
...e "boost/multi_index/sequenced_index.hpp"
#include "boost/multi_index/mem_fun.hpp"
using boost::multi_index_container;
using namespace boost::multi_index;
typedef char IDType[81];
struct TParam
{
IDType ID;
bool IsValid;
};
typedef TParam* TParam_p;
struct TParamIDIndex { };
st...
首次打开app时，提示打开蓝牙权限，打开后点击开始搜索，设备列表没有显示...
本帖最后由 fun_hcf 于 2025-08-11 09:48 编辑
首次打开app时，提示打开蓝牙权限，打开后点击开始搜索，设备列表没有显示蓝牙设备，而且app卡住了点不动，后面需要先在手机系统设置先打开蓝牙，然后启动app才能搜索到设备，请...
How to use hex color values
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How would you handle 123ABC? The compiler is burking at it not being a digit.
– Islam Q.
Mar 2 '16 at 6:28
1
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ImportError: No module named apiclient.discovery
...mand:
conda install -c conda-forge google-api-python-client
See more at https://anaconda.org/conda-forge/google-api-python-client
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Fast permutation -> number -> permutation mapping algorithms
....1
("The Lehmer code (inversion table)", p.232ff) of the fxtbook:
http://www.jjj.de/fxt/#fxtbook
skip to section 10.1.1.1 ("Computation with large arrays" p.235) for the fast method.
The (GPLed, C++) code is on the same web page.
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UIButton: Making the hit area larger than the default hit area
... area of at least 44x44 points, as per Apple's Human Interface Guidelines (https://developer.apple.com/ios/human-interface-guidelines/visual-design/layout/)
Swift 2:
private let minimumHitArea = CGSizeMake(44, 44)
extension UIButton {
public override func hitTest(point: CGPoint, withEvent eve...