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switch case statement error: case expressions must be constant expression
...ing:
In Eclipse
Move your cursor to the switch keyword and press Ctrl + 1 then select
Convert 'switch' to 'if-else'.
In Android Studio
Move your cursor to the switch keyword and press Alt + Enter then select
Replace 'switch' with 'if'.
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Why use a prime number in hashCode?
...rt into. If the number you are using to multiply by is some multiple of 8, then the bucket inserted into will only be determined by the least significant entry (the one not multiplied at all). Similar entries will collide. Not good for a hash function.
31 is a large enough prime that the number of ...
Best way to remove an event handler in jQuery?
...put-image is paired with, I setup an event handler for the input-image . Then when the user clicks the image , they get a little popup to add some notes to the data.
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Putty: Getting Server refused our key Error
...answer, edit
/etc/ssh/sshd_config
and set log level:
LogLevel DEBUG3
Then try to authenticate, and when it fails, look for log file:
/var/log/secure
It will have errors you are looking for.
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Adding multiple columns AFTER a specific column in MySQL
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If you want to add a single column after a specific field, then the following MySQL query should work:
ALTER TABLE users
ADD COLUMN count SMALLINT(6) NOT NULL
AFTER lastname
If you want to add multiple columns, then you need to use 'ADD' command each time for a column. Here ...
Can you explain the HttpURLConnection connection process?
...getInputStream? Since I'm only able to get the response at getInputStream, then does it mean that I didn't send any request at getOutputStream yet but simply establishes a connection?
Keep in mind that sending a request and sending data are two different operations. When you invoke getOutputStream...
What does threadsafe mean?
...o save will overwrite the work of the first person. To make it thread safe then, you have to force person 2 to wait for person 1 to complete their task before allowing person 2 to edit the document.
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What is the difference between bottom-up and top-down?
...c programming) consists in first looking at the "smaller" subproblems, and then solve the larger subproblems using the solution to the smaller problems.
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Can I export a variable to the environment from a bash script without sourcing it?
... is to have a script that sets your environment variable(s) internally and then invokes a specified command with that environment:
$ cat set-vars3.sh
#!/bin/bash
export FOO=BAR
exec "$@"
$ ./set-vars3.sh printenv | grep FOO
FOO=BAR
This last approach can be quite useful, though it's inconvenient ...
C++ - passing references to std::shared_ptr or boost::shared_ptr
...he most recently sent message, but while a message is currently being sent then there must be no previous message (the variable should be reset before sending). So we declare the new variable:
std::shared_ptr<std::string> previous_message;
Then we amend our function according to the rules w...