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CharSequence VS String in Java?
... then dynamically build String when a get() happens. Each String will be a new object, so no caching returned values and using ==
Build a CharSequence[] at parse time. Since no new data is stored (other than offsets into the byte buffer), the parsing is much lower that #1. At get time, we don't need...
Combine two or more columns in a dataframe into a new column with a new name
...
@Levi, that x represents the name of the new column that contains the combined values. Think of dplyr's mutate: df %>% dplyr::mutate(x = "your operations")
– Vesanen
Aug 13 at 18:33
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How can I rollback a github repository to a specific commit?
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get the very latest SHA id to undo.
git revert SHA
That will create a new commit that does the exact opposite of your commit. Then you can push this new commit to bring your app to the state it was before, and your git history will show these changes accordingly.
This is good for an immediate...
Branch from a previous commit using Git
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To push the new branch correctly to server.. needed this last step: git push origin BRANCH_NAME
– Gene Bo
Oct 15 '15 at 0:04
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How to delete a stash created with git stash create?
...downvote correct answer specific to the second half of the title. That's a new one.
– dahlbyk
Sep 18 '13 at 3:19
10
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How to request a random row in SQL?
...om row with Microsoft SQL Server:
SELECT TOP 1 column FROM table
ORDER BY NEWID()
Select a random row with IBM DB2
SELECT column, RAND() as IDX
FROM table
ORDER BY IDX FETCH FIRST 1 ROWS ONLY
Select a random record with Oracle:
SELECT column FROM
( SELECT column FROM table
ORDER BY dbms_ran...
SQL Server - copy stored procedures from one db to another
I am new to SQL, and what I needed to do was to combine 2 .mdf databases into one. I did that using SQL Server 2008 Manager - Tasks > Import/Export tables.The tables and views were copied successfully, but there are no Stored procedures in the new database. Is there any way to do that?
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How to create an exit message
...unction () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f29539%2fhow-to-create-an-exit-message%23new-answer', 'question_page');
}
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...
Regular expression to match a dot
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"In the default mode, Dot (.) matches any character except a newline. If the DOTALL flag has been specified, this matches any character including a newline." (python Doc)
So, if you want to evaluate dot literaly, I think you should put it in square brackets:
>>> p = re.comp...
Android: Difference between Parcelable and Serializable?
...ress == null))
return address;
else
return new ArrayList<String>();
}
public String getName() {
return name;
}
public String getAge() {
return age;
}
}
// MyObjects instance
MyObjects mObjects = new MyObjects("name", "ag...