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Java: PrintStream to String?
I have a function that takes an object of a certain type, and a PrintStream to which to print, and outputs a representation of that object. How can I capture this function's output in a String? Specifically, I want to use it as in a toString method.
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Django queries - id vs pk
When writing django queries one can use both id/pk as query parameters.
2 Answers
2
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Switch to another Git tag
How do I check out version version/tag 1.1.4 of the rspec bundle ?
2 Answers
2
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What is the difference between Class.this and this in Java
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In this case, they are the same. The Class.this syntax is useful when you have a non-static nested class that needs to refer to its outer class's instance.
class Person{
String name;
public void setName(String name){
this.name = name;
}
class Displayer {
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Numpy how to iterate over columns of array?
Suppose I have and m x n array. I want to pass each column of this array to a function to perform some operation on the entire column. How do I iterate over the columns of the array?
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Any reason why scala does not explicitly support dependent types?
...h dependent types and I think it is possible to express almost all the features of such languages as Epigram or Agda in Scala, but I'm wondering why Scala does not support this more explicitly like it does very nicely in other areas (say, DSLs) ?
Anything I'm missing like "it is not necessary" ?
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Calculate total seconds in PHP DateInterval
What is the best way to calculate the total number of seconds between two dates? So far, I've tried something along the lines of:
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Add a fragment to the URL without causing a redirect?
Is there is a way how to add hash # to my URL without redirect?
3 Answers
3
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DROP IF EXISTS VS DROP?
... TABLE table_name;
IF EXISTS is not standard; different platforms might support it with different syntax, or not support it at all. In PostgreSQL, the syntax is
DROP TABLE IF EXISTS table_name;
The first one will throw an error if the table doesn't exist, or if other database objects depend on ...