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Should I use Java's String.format() if performance is important?
...String[] args ){
int i = 0;
long prev_time = System.currentTimeMillis();
long time;
for( i = 0; i< 100000; i++){
String s = "Blah" + i + "Blah";
}
time = System.currentTimeMillis() - prev_time;
System.out.println("Time after for loop " + time);
prev_time...
Preferred Java way to ping an HTTP URL for availability
I need a monitor class that regularly checks whether a given HTTP URL is available. I can take care of the "regularly" part using the Spring TaskExecutor abstraction, so that's not the topic here. The question is: What is the preferred way to ping a URL in java?
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How can I convert String to Int?
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Try this:
int x = Int32.Parse(TextBoxD1.Text);
or better yet:
int x = 0;
Int32.TryParse(TextBoxD1.Text, out x);
Also, since Int32.TryParse returns a bool you can use its return value to make decisions about the results of th...
Finding the type of an object in C++
...only B has, so I want to return false and not proceed if the object passed is not of type B.
11 Answers
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How do I create a constant in Python?
Is there a way to declare a constant in Python? In Java we can create constant values in this manner:
41 Answers
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Is there a way to access an iteration-counter in Java's for-each loop?
Is there a way in Java's for-each loop
15 Answers
15
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What's the purpose of using braces (i.e. {}) for a single-line if or loop?
... if (i % 2 == 0)
j++;
i++;
Oh no! Coming from Python, this looks ok, but in fact it isn't, as it's equivalent to:
int j = 0;
for (int i = 0 ; i < 100 ; ++i)
if (i % 2 == 0)
j++;
i++;
Of course, this is a silly mistake, but one that even an experienced programmer ...
C++, What does the colon after a constructor mean? [duplicate]
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As others have said, it's an initialisation list. You can use it for two things:
Calling base class constructors
Initialising member variables before the body of the constructor executes.
For case #1, I assume you understand inheritance (if that's not the c...
Is there a software-engineering methodology for functional programming? [closed]
Software Engineering as it is taught today is entirely focused on object-oriented programming and the 'natural' object-oriented view of the world. There is a detailed methodology that describes how to transform a domain model into a class model with several steps and a lot of (UML) artifacts like us...
Return None if Dictionary key is not available
I need a way to get a dictionary value if its key exists, or simply return None , if it does not.
11 Answers
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