11,322 questions
3940
votes
21
answers
4.1m
views
936
votes
23
answers
1.6m
views
How do I copy an object in Java?
Consider the code below:
DummyBean dum = new DummyBean();
dum.setDummy("foo");
System.out.println(dum.getDummy()); // prints 'foo'
DummyBean dumtwo = dum;
System.out.println(dumtwo.getDummy()); // ...
- 33.3k
753
votes
31
answers
887k
views
What is the difference between a deep copy and a shallow copy?
What is the difference between a deep copy and a shallow copy?
- 18.1k
635
votes
29
answers
525k
views
Copy the entire contents of a directory in C#
I want to copy the entire contents of a directory from one location to another in C#.
There doesn't appear to be a way to do this using System.IO classes without lots of recursion.
There is a method ...
- 157k
554
votes
7
answers
336k
views
Why updating "shallow" copy dictionary doesn't update "original" dictionary? [duplicate]
While reading up the documentation for dict.copy(), it says that it makes a shallow copy of the dictionary. Same goes for the book I am following (Beazley's Python Reference), which says:
The m....
- 133k
419
votes
11
answers
879k
views
Make copy of an array
I have an array a which is constantly being updated. Let's say a = [1,2,3,4,5]. I need to make an exact duplicate copy of a and call it b. If a were to change to [6,7,8,9,10], b should still be [1,2,3,...
- 3,864
383
votes
10
answers
581k
views
How do I copy items from list to list without foreach?
How do I transfer the items contained in one List to another in C# without using foreach?
- 13.5k
355
votes
8
answers
969k
views
Copy tables from one database to another in SQL Server
I have a database called foo and a database called bar. I have a table in foo called tblFoobar that I want to move (data and all) to database bar from database foo. What is the SQL statement to do ...
- 6,219
324
votes
10
answers
418k
views
Copy files from one directory into an existing directory
In bash I need to do this:
take all files in a directory
copy them into an existing directory
How do I do this? I tried cp -r t1 t2 (both t1 and t2 are existing directories, t1 has files in it) but ...
- 3,241
304
votes
12
answers
163k
views
What is the difference between shallow copy, deepcopy and normal assignment operation?
import copy
a = "deepak"
b = 1, 2, 3, 4
c = [1, 2, 3, 4]
d = {1: 10, 2: 20, 3: 30}
a1 = copy.copy(a)
b1 = copy.copy(b)
c1 = copy.copy(c)
d1 = copy.copy(d)
print("immutable - id(a)==id(a1)", id(a) == ...
- 4,515
301
votes
5
answers
204k
views
Git: copy all files in a directory from another branch
How do I copy all files in a directory from another branch? I can list all of the files in that directory by doing
git ls-tree master:dirname
I can then copy all of the files individually by doing
...
- 3,313
291
votes
19
answers
548k
views
Using scp to copy a file to Amazon EC2 instance? [closed]
I am trying to use my Mac Terminal to scp a file from Downloads (phpMyAdmin I downloaded online) to my Amazon EC2 instance.
The command I used was:
scp -i myAmazonKey.pem phpMyAdmin-3.4.5-all-...
- 4,227
269
votes
16
answers
424k
views
MySQL: Cloning a MySQL database on the same MySql instance
I would like to write a script which copies my current database sitedb1 to sitedb2 on the same mysql database instance. I know I can dump the sitedb1 to a sql script:
mysqldump -u root -p sitedb1 >...
- 4,323
267
votes
7
answers
191k
views
Git copy file preserving history [duplicate]
I have a somewhat confusing question in Git.
Lets say, I have a file dir1/A.txt committed and git preserves a history of commits
Now I need to copy the file into dir2/A.txt (not move, but copy).
I ...
- 42.9k
258
votes
15
answers
187k
views
How to clone or copy a list in kotlin
How to copy list in Kotlin?
I'm using
val selectedSeries = mutableListOf<String>()
selectedSeries.addAll(series)
Is there a easier way?
- 14.6k
246
votes
4
answers
289k
views
How to copy in bash all directory and files recursive?
I have script:
find ./SourceFolder/ -maxdepth 4 -exec cp -R '{}' ./DestFolder/ \;
SourceDir contains also sub-folders.
Problem that in DestFolder not only all tree, but in up level all another ...
- 24.4k
232
votes
2
answers
47k
views
Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
I'm having a little trouble understanding the pass-by-reference properties of data.table. Some operations seem to 'break' the reference, and I'd like to understand exactly what's happening.
On ...
- 2,933
214
votes
9
answers
178k
views
How do I create a copy of an object in PHP?
It appears that in PHP objects are passed by reference. Even assignment operators do not appear to be creating a copy of the Object.
Here's a simple, contrived proof:
<?php
class A {
public $...
- 45k
203
votes
3
answers
62k
views
Record file copy operation with Git
When I move a file in git using git-mv the status shows that the file has been renamed and even if I alter some portions it still considers to be almost the same thing (which is good because it lets ...
- 2,216
196
votes
4
answers
226k
views
PyTorch preferred way to copy a tensor
There seems to be several ways to create a copy of a tensor in PyTorch, including
y = tensor.new_tensor(x) #a
y = x.clone().detach() #b
y = torch.empty_like(x).copy_(x) #c
y = torch.tensor(x) #d
b ...
- 7,392
190
votes
15
answers
369k
views
How to copy a java.util.List into another java.util.List
I have a List<SomeBean> that is populated from a Web Service. I want to copy/clone the contents of that list into an empty list of the same type. A Google search for copying a list suggested me ...
- 4,627
187
votes
13
answers
377k
views
How to copy data from one table to another new table in MySQL?
I want to copy data from one table to another in MySQL.
Table 1 (Existing table):
aid
st_id
from_uid
to_gid
to_uid
created
changed
subject
message
link
Table 2 (New Table)
st_id
uid
changed
...
- 13.3k
185
votes
5
answers
349k
views
Batch file to copy directories recursively
Is there a way to copy directories recursively inside a .bat file? Is an example of this available?
- 28k
181
votes
10
answers
380k
views
How to copy a file from one directory to another using PHP?
Say I've got a file test.php in foo directory as well as bar. How can I replace bar/test.php with foo/test.php using PHP? I'm on Windows XP, a cross platform solution would be great but windows ...
- 268k
178
votes
9
answers
446k
views
How to copy file from HDFS to the local file system
How to copy file from HDFS to the local file system . There is no physical location of a file under the file , not even directory . how can i moved them to my local for further validations.i am tried ...
- 3,518