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What is the Java string pool and how is “s” different from new String(“s”)? [duplicate]
What is meant by String Pool ? And what is the difference between the following declarations:
5 Answers
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Remove Primary Key in MySQL
...property before dropping the key:
ALTER TABLE user_customer_permission MODIFY id INT NOT NULL;
ALTER TABLE user_customer_permission DROP PRIMARY KEY;
Note that you have a composite PRIMARY KEY which covers all three columns and id is not guaranteed to be unique.
If it happens to be unique, you c...
How to Remove Array Element and Then Re-Index Array?
I have some troubles with an array. I have one array that I want to modify like below. I want to remove element (elements) of it by index and then re-index array. Is it possible?
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How to concatenate multiple lines of output to one line?
If I run the command cat file | grep pattern , I get many lines of output. How do you concatenate all lines into one line, effectively replacing each "\n" with "\" " (end with " followed by space)?
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Why does cURL return error “(23) Failed writing body”?
...ill reappear.You could use -s to silence all error messages (and progress) if you don't need them.
– Kaworu
Jun 13 '16 at 10:37
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C# List to string with delimiter
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You can use String.Join. If you have a List<string> then you can call ToArray first:
List<string> names = new List<string>() { "John", "Anna", "Monica" };
var result = String.Join(", ", names.ToArray());
In .NET 4 you don't need...
How do you change a repository description on GitHub?
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As of 2020, if you chose the new design in feature preview, meta-information about the repository can be changed by clicking on a cog icon in the right-hand side menu's "About" section:
Upon doing so, a popup will appear where the descr...
Can you supply arguments to the map(&:method) syntax in Ruby?
...mcaplan suggested in the comment below, you could create a shorter syntax, if you rename the with method to call. In this case, ruby has a built in shortcut for this special method .().
So you could use the above like this:
class Symbol
def call(*args, &block)
->(caller, *rest) { call...
Deleting Row in SQLite in Android
...;" => 'any SQL command' will be executed. Of course it is not a problem if there is no GUI for that feature.
– bdevay
Mar 15 '14 at 12:45
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java.net.ConnectException: localhost/127.0.0.1:8080 - Connection refused
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Since you have not specified you are connected to a server from the device or emulator so I guess you are using your application in the emulator.
If you are referring your localhost on your system from the Android emulator then you have to use htt...