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When should we call System.exit in Java
...
In that case, it's not needed. No extra threads will have been started up, you're not changing the exit code (which defaults to 0) - basically it's pointless.
When the docs say the method never returns normally, it means the subsequent line of code is effect...
Determine the data types of a data frame's columns
...integer" "logical" "factor"
Using str() gets you that information plus extra goodies (such as the levels of your factors and the first few values of each variable):
str(my.data)
'data.frame': 5 obs. of 4 variables:
$ y : num 1.03 1.599 -0.818 0.872 -2.682
$ x1: int 1 2 3 4 5
$ x2: logi T...
Check if a variable is a string in JavaScript
How can I determine whether a variable is a string or something else in JavaScript?
25 Answers
...
Implementing IDisposable correctly
... User : IDisposable
{
public int id { get; protected set; }
public string name { get; protected set; }
public string pass { get; protected set; }
public User(int userID)
{
id = userID;
}
public User(string Username, string Password)
{
name = Username;...
Deserialize JSON with C#
...okFriend> data {get; set;}
}
public class FacebookFriend
{
public string id {get; set;}
public string name {get; set;}
}
Then you should be able to do:
Friends facebookFriends = new JavaScriptSerializer().Deserialize<Friends>(result);
The names of my classes are just an examp...
What is the Java equivalent of PHP var_dump?
...maybe even in all classes you write...), you should implement a sensible toString method. So here you need to override toString() in your Person class and return the desired state.
There are utilities available that help with writing a good toString method, or most IDEs have an automatic toString(...
Why not abstract fields?
...ised in its constructor (untested code):
abstract class Base {
final String errMsg;
Base(String msg) {
errMsg = msg;
}
abstract String doSomething();
}
class Sub extends Base {
Sub() {
super("Sub message");
}
String doSomething() {
return e...
MongoDB: Is it possible to make a case-insensitive query?
...
Especially if you're interpolating a string ({foo: /#{x}/i}) that could have a question mark in it..
– Peter Ehrlich
Dec 16 '11 at 18:53
17
...
What is __init__.py for?
...his mean: "this is done to prevent directories with a common name, such as string, from unintentionally hiding valid modules that occur later on the module search path"?
– Carl G
Jan 25 '14 at 4:43
...
Difference between “git add -A” and “git add .”
.... and by doing that it makes his life easier even after accounting for the extra mental tax added to ensure that there're no sync problems? I wonder why Git doesn't furthur split add -u into two separate commands add -u1 and add-u2 whereby one works for files starting with numerals and the other for...