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Difference between matches() and find() in Java Regex
...e end of your pattern, meaning it will not look for a substring. Hence the output of this code:
public static void main(String[] args) throws ParseException {
Pattern p = Pattern.compile("\\d\\d\\d");
Matcher m = p.matcher("a123b");
System.out.println(m.find());
System.out.println(m...
Java string to date conversion
...("MMMM d, yyyy", Locale.ENGLISH);
Date date = format.parse(string);
System.out.println(date); // Sat Jan 02 00:00:00 GMT 2010
Note the importance of the explicit Locale argument. If you omit it, then it will use the default locale which is not necessarily English as used in the month name of the in...
Convert RGBA PNG to RGB with PIL
...to convert a transparent PNG image uploaded with Django to a JPG file. The output looks broken.
7 Answers
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How do I use DateTime.TryParse with a Nullable?
...e? d=null;
DateTime d2;
bool success = DateTime.TryParse("some date text", out d2);
if (success) d=d2;
(There might be more elegant solutions, but why don't you simply do something as above?)
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JUnit test for System.out.println()
... that's poorly designed and is writing a lot of error messages to standard output. When the getResponse(String request) method behaves correctly it returns a XML response:
...
Print an integer in binary format in Java
...
Assuming you mean "built-in":
int x = 100;
System.out.println(Integer.toBinaryString(x));
See Integer documentation.
(Long has a similar method, BigInteger has an instance method where you can specify the radix.)
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Static Vs. Dynamic Binding in Java
...lection argument
public Collection sort(Collection c) {
System.out.println("Inside Collection sort method");
return c;
}
//another overloaded method which takes HashSet argument which is sub class
public Collection sort(HashSet hs) {
System.out.println("Inside...
Difference between >>> and >>
...gt;s is n right-shifted s bit positions with zero-extension.
System.out.println(Integer.toBinaryString(-1));
// prints "11111111111111111111111111111111"
System.out.println(Integer.toBinaryString(-1 >> 16));
// prints "11111111111111111111111111111111"
System.out.println...
How to check whether a pandas DataFrame is empty?
...
I prefer going the long route. These are the checks I follow to avoid using a try-except clause -
check if variable is not None
then check if its a dataframe and
make sure its not empty
Here, DATA is the suspect variable -
DATA is not None an...
How to assert output with nosetest/unittest in python?
...
I use this context manager to capture output. It ultimately uses the same technique as some of the other answers by temporarily replacing sys.stdout. I prefer the context manager because it wraps all the bookkeeping into a single function, so I don't have to re-w...