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What is the default initialization of an array in Java?
...
Everything in a Java program not explicitly set to something by the programmer, is initialized to a zero value.
For references (anything that holds an object) that is null.
For int/short/byte/long that is a 0.
For float/double that is a 0.0
For booleans that is a f...
Add new item count to icon on button - Android
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Make your badge a TextView, allowing you to set the numeric value to anything you like by calling setText(). Set the background of the TextView as an XML <shape> drawable, with which you can create a solid or gradient circle with a border. An XML drawable will ...
Is it possible to print a variable's type in standard C++?
...ich can turn an expression into a type. And decltype() comes with its own set of very interesting rules. For example decltype(a) and decltype((a)) will generally be different types (and for good and understandable reasons once those reasons are exposed).
Will our trusty typeid(a).name() help us e...
How to split() a delimited string to a List
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Java - escape string to prevent SQL injection
...ction conn = null;
PreparedStatement stmt = null;
try {
conn = setupTheDatabaseConnectionSomehow();
stmt = conn.prepareStatement("INSERT INTO person (name, email) values (?, ?)");
stmt.setString(1, name);
stmt.setString(2, email);
stmt.executeUpdate();
}
fin...
Find the most frequent number in a numpy vector
...r loop
>>>
>>> max(map(lambda val: (a.count(val), val), set(a)))[1]
12
>>> %timeit max(map(lambda val: (a.count(val), val), set(a)))[1]
100000 loops, best of 3: 4.11 µs per loop
>>>
Best is 'max' with 'set' for small arrays like the problem.
According to @Da...
What does FETCH_HEAD in Git mean?
...opied the commit to my local machine, had not created a local tag, but had set FETCH_HEAD to the value of the commit, so that I could find and use it. I then used FETCH_HEAD to create a local tag which matched the tag on the remote. That is a practical illustration of what FETCH_HEAD is and how it c...
How to reverse a singly linked list using only two pointers?
...The only bug, though, is the last line in the reverse() function should be setting first, I believe. Otherwise, the original code worked OK when plugged into your neat test harness. You get +1 from me even so - but an explanation of what you consider the 'obvious errors' would improve your answer....
Elegant ways to support equivalence (“equality”) in Python classes
...e).
Are we there yet? Not quite. How many unique numbers do we have?
len(set([n1, n2, n3])) # 3 -- oops
Sets use the hashes of objects, and by default Python returns the hash of the identifier of the object. Let’s try to override it:
def __hash__(self):
"""Overrides the default implementa...
An “and” operator for an “if” statement in Bash
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