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java - What is the difference between up-casting and down-casting with respect to class variable

What is the difference between up-casting and down-casting with respect to class variable? For example in the following program ... ; ((Dog) a).callme2(); } } Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - Warning: mysql_connect(): [2002] No such file or directory (trying to connect via unix:///tmp/mysql.sock) in

I'm trying to connect to my MySQL DB with the Terminal on my Apple (With PHP). Yesterday it worked fine, and ... I use at the Terminal is php scriptname.php. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Access Control Request Headers, is added to header in AJAX request with jQuery

I would like to add a custom header to an AJAX POST request from jQuery. I have tried this: $.ajax({ ... value My-Second-Header: second value Is it possible? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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class - How to invoke the super constructor in Python?

class A: def __init__(self): print("world") class B(A): def __init__(self): print("hello") B() # output: ... I would expect super(self) but this doesn't work. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How do I detect if software keyboard is visible on Android Device or not?

Is there a way in Android to detect if the software (a.k.a. "soft") keyboard is visible on screen? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Why would you use String.Equals over ==?

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - SQL Data Reader - handling Null column values

I'm using a SQLdatareader to build POCOs from a database. The code works except when it encounters a null ... way to handle null values in this situation? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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What is the difference between `let` and `var` in Swift?

What is the difference between let and var in Apple's Swift language? In my understanding, it is a compiled language but ... 'let' to 'var' to make it mutable Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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github - git command for making one branch like another

I'm trying to take a branch with changes and bring it back to be identical to the upstream it diverged from. ... Is there such a command or series of commands? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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inheritance - Is there a way to override class variables in Java?

class Dad { protected static String me = "dad"; public void printMe() { System.out.println(me); } } class Son ... Is there a way to make it print "son"? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to find files that match a wildcard string in Java?

This should be really simple. If I have a String like this: ../Test?/sample*.txt then what is a generally- ... didn't have non-file arguments in the mix.) Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Accessing elements of Python dictionary by index

Consider a dict like mydict = { 'Apple': {'American':'16', 'Mexican':10, 'Chinese':5}, 'Grapes':{'Arabian':'25 ... so I can't directly use 'American' as a key. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Adding external library into Qt Creator project

How can I add external library into a project built by Qt Creator RC1 (version 0.9.2)? For example, the win32 ... Psapi.lib to be added in the project to build. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jsf 2 - Spawning threads in a JSF managed bean for scheduled tasks using a timer

I would like to know if it's ok to use Timer inside application scoped beans. Example, lets say that I want to ... this or should I stick with the old pattern? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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optimization - Handling very large numbers in Python

I've been considering fast poker hand evaluation in Python. It occurred to me that one way to speed the ... allow me to perform arithmetic operations on it? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Using setDate in PreparedStatement

In order to make our code more standard, we were asked to change all the places where we hardcoded our SQL ... I use setString() instead with a to_date()? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Why Python 3.6.1 throws AttributeError: module 'enum' has no attribute 'IntFlag'?

I just installed Python 3.6.1 for MacOS X When I attempt to run the Console(or run anything with Python3), ... .py. So, why is the AttributeError being thrown? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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JavaScript numbers to Words

I'm trying to convert numbers into english words, for example 1234 would become: "one thousand two hundred thirty four ... Numbers Printed</div> </body> </html> Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - How to get multiple counts with one SQL query?

I am wondering how to write this query. I know this actual syntax is bogus, but it will help you ... 'SELECT distributor_id, COUNT(*) GROUP BY distributor_id' Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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datetime - PHP Sort a multidimensional array by element containing date

I have an array such as: Array ( [0] => Array ( [id] => 2 [type] => comment [text] => hey [ ... suggest a way to sort/order this based on the datetime element? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How can I call PHP functions by JavaScript?

I am trying to call a PHP function from an external PHP file into a JavaScript script. My code is different ... , but it should call values from external PHP. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How accurate is python's time.sleep()?

I can give it floating point numbers, such as time.sleep(0.5) but how accurate is it? If i give it time.sleep(0.05) will it really sleep about 50 ms? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bignum - Working with large numbers in PHP

To use modular exponentiation as you would require when using the Fermat Primality Test with large numbers (100, ... values that would work for large numbers? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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excel - VLOOKUP with multiple criteria returning values in one cell

I found this VBA that is capable to return all matching values into one cell using one criteria to match: Function ... A.0002 matches. Outcome should be 8 3 Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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xml - How to fix error: The markup in the document following the root element must be well-formed

I put my code in the XML validation website and it gives me this error: Line 8: 4 The markup in the document ... <xsl:apply-templates/> </html> </xsl:template> Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - python3 --version shows "NameError: name 'python3' is not defined"

When we type python3 --version (or --V) it is supposed to show us the version of the python right? ... 1 python3 get-pip.py ^ SyntaxError: invalid syntax Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How do I tell if a regular file does not exist in Bash?

I've used the following script to see if a file exists: #!/bin/bash FILE=$1 if [ -f $FILE ]; then echo " ... exist ]; then echo "File $FILE does not exist." fi Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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What is HEAD in Git?

You see the Git documentation saying things like The branch must be fully merged in HEAD. But what is Git HEAD exactly? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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