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I have; List<String> stringList = new ArrayList<String>(); List<Integer> integerList = new ArrayList<Integer>(); ... to retrieve the generic type of the list? Question&Answers:os...

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algorithm - How to create the most compact mapping n → isprime(n) up to a limit N?

Naturally, for bool isprime(number) there would be a data structure I could query. I define the best algorithm, to be ... of bits. How do I solve the problem? Question&Answers:os...

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java - What is the difference between Class.getResource() and ClassLoader.getResource()?

I wonder what the difference is between Class.getResource() and ClassLoader.getResource()? edit: I especially ... me with some illumination into this matter? Question&Answers:os...

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

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How do I concatenate text files in Python?

I have a list of 20 file names, like ['file1.txt', 'file2.txt', ...]. I want to write a Python script to ... Is there a more "elegant" way to do this in Python? Question&Answers:os...

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java - Received fatal alert: handshake_failure through SSLHandshakeException

I have a problem with authorized SSL connection. I have created Struts Action that connects to external server with ... have the same error, with no changes. Question&Answers:os...

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How do you check that a number is NaN in JavaScript?

I've only been trying it in Firefox's JavaScript console, but neither of the following statements return true: ... ; parseFloat('geoff') == Number.NaN; Question&Answers:os...

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regex - Regular expression for a string containing one word but not another

I'm setting up some goals in Google Analytics and could use a little regex help. Lets say I have 4 ... =size portion. Any help would be greatly appreciated! Question&Answers:os...

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python - Extracting an attribute value with beautifulsoup

I am trying to extract the content of a single "value" attribute in a specific "input" tag on a ... have misunderstood. Any suggestion is greatly appreciated! Question&Answers:os...

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python - Do regular expressions from the re module support word boundaries ()?

While trying to learn a little more about regular expressions, a tutorial suggested that you can use the to match ... in Python or am I using it wrong? Question&Answers:os...

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javascript - Display data streamed from a Flask view as it updates

I have a view that generates data and streams it in real time. I can't figure out how to send this data to a ... (), mimetype='text/html') app.run(debug=True) Question&Answers:os...

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bash - Reading quoted/escaped arguments correctly from a string

I'm encountering an issue passing an argument to a command in a Bash script. poc.sh: #!/bin/bash ARGS='"hi ... , with "hi there" having no quotes around it? Question&Answers:os...

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ios - Set the maximum character length of a UITextField

How can I set the maximum amount of characters in a UITextField on the iPhone SDK when I load up a UIView? Question&Answers:os...

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Java Hashmap: How to get key from value?

If I have the value "foo", and a HashMap<String> ftw for which ftw.containsValue("foo") returns true, how can I ... hashmap? What is the best way to do that? Question&Answers:os...

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java - Check whether a string is not null and not empty

How can I check whether a string is not null and not empty? public void doStuff(String str) { if (str != null && str ! ... handle empty string */ } /* ... */ } Question&Answers:os...

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c++ - How does delete[] "know" the size of the operand array?

Foo* set = new Foo[100]; // ... delete [] set; You don't pass the array's boundaries to delete[]. But where is that information stored? Is it standardised? Question&Answers:os...

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security - Difference between Hashing a Password and Encrypting it

The current top-voted to this question states: Another one that's not so much a security issue, although ... unsafe functionality the poster is referring to? Question&Answers:os...

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

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javascript - ng-repeat finish event

I want to call some jQuery function targeting div with table. That table is populated with ng-repeat. When I call it on ... use it with ng-repeat and my div... Question&Answers:os...

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java - What is an initialization block?

We can put code in a constructor or a method or an initialization block. What is the use of initialization ... necessary that every java program must have it? Question&Answers:os...

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ios - How to input currency format on a text field (from right to left) using Swift?

I have a number let's say 0.00. When the user taps 1. We should have 0.01 When the user taps 2. We ... should display 12.34 How can I do that with Swift? Question&Answers:os...

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html - flex property not working in IE

I have been unable to determine why flexbox is not working in IE 11. For testing, I sourced a very simple flexbox layout from ... li>9</li> <li>10</li> </ul> Question&Answers:os...

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python - Difference between del, remove, and pop on lists

>>> a=[1,2,3] >>> a.remove(2) >>> a [1, 3] >>> a=[1,2,3] >>> del a[1] >>> ... any difference between the above three methods to remove an element from a list? Question&Answers:os...

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c# - How to check if a number is a power of 2

Today I needed a simple algorithm for checking if a number is a power of 2. The algorithm needs to ... value: 9223372036854775809. Is there a better algorithm? Question&Answers:os...

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c++ - When to use references vs. pointers

I understand the syntax and general semantics of pointers versus references, but how should I decide when it is ... is a shame to lose the syntactic clarity. Question&Answers:os...

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internet explorer - Why does JavaScript only work after opening developer tools in IE once?

IE9 Bug - JavaScript only works after opening developer tools once. Our site offers free pdf downloads to users, ... do I make this work in Internet Explorer? Question&Answers:os...

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c++ - Virtual/pure virtual explained

What exactly does it mean if a function is defined as virtual and is that the same as pure virtual? Question&Answers:os...

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android - Multiple dex files define Landroid/support/v4/accessibilityservice/AccessibilityServiceInfoCompat

If I run gradle assembleDebug from the command line, I am suddenly getting this error: UNEXPECTED TOP-LEVEL EXCEPTION: com. ... .google.code.gson:gson:2.2.4' } Question&Answers:os...

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jsf - When to use valueChangeListener or f:ajax listener?

What's the difference between the following two pieces of code - with regards to listener placement? <h:selectOneMenu ... :selectItems ... /> </h:selectOneMenu> Question&Answers:os...

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module - How to deal with cyclic dependencies in Node.js

I've been working with nodejs lately and still getting to grips with the module system so apologies if this ... a better way to share variables between modules? Question&Answers:os...

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

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