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What is the difference between “text” and new String(“text”)?
... String s = "text"; may reuse an instance from the string constant pool if one is available.
You very rarely would ever want to use the new String(anotherString) constructor. From the API:
String(String original) : Initializes a newly created String object so that it represents the same sequenc...
Metadata file '.dll' could not be found
...s well and lead to very strange Visual Studio behaviour, so deleting it is one of the things I always try.
Note that deleting the .suo file will reset the startup project(s) of the solution.
More on the .suo file is here.
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PostgreSQL: Show tables in PostgreSQL
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\dt is very useful. That pg_catalog.pg_tables one is much less so, as it appears to lump internal tables together with the user-created ones for whatever database you happen to be connected to.
– aroth
Jul 29 '13 at 6:25
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Using group by on multiple columns
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Group By X means put all those with the same value for X in the one group.
Group By X, Y means put all those with the same values for both X and Y in the one group.
To illustrate using an example, let's say we have the following table, to do with who is attending what subject at a univers...
Java synchronized method lock on object, or method?
...object would block each other anyway.
If you want to synchronize only on one variable at a time, so two threads won't block each other while accessing different variables, you have synchronize on them separately in synchronized () blocks. If a and b were object references you would use:
public vo...
Regular cast vs. static_cast vs. dynamic_cast [duplicate]
I've been writing C and C++ code for almost twenty years, but there's one aspect of these languages that I've never really understood. I've obviously used regular casts i.e.
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When to use LinkedList over ArrayList in Java?
I've always been one to simply use:
33 Answers
33
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How to delete large data of table in SQL without log?
...able with same schema and import these rows back into this ex-Large table.
One last option I can think of is to change your database's Recovery Mode to SIMPLE and then delete rows in smaller batches using a while loop something like this..
DECLARE @Deleted_Rows INT;
SET @Deleted_Rows = 1;
WHILE (...
Is it safe to get values from a java.util.HashMap from multiple threads (no modification)?
... AtomicX classes
Initialize the value into a final field (JLS 17.5).
The ones most interesting for your scenario are (2), (3) and (4). In particular, (3) applies directly to the code I have above: if you transform the declaration of MAP to:
public static volatile HashMap<Object, Object> MAP...
nginx - client_max_body_size has no effect
...stions from nembleton & rjha94)
I thought it might be helpful for someone, if I added a little clarification to their suggestions. For starters, please be certain you have included your increased upload directive in ALL THREE separate definition blocks (server, location & http). Each shou...