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What is the difference between an interface and abstract class?

... interface does not have an implementation for a method is no longer valid now. Refer to this documentation page for more details. Have a look at this SE question for code examples to understand better. How should I have explained the difference between an Interface and an Abst
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How should I choose an authentication library for CodeIgniter? [closed]

...ore up to date and active then tank-auth at this point in time. I want to know from a security perspective if it is as good as Tank-auth or not, because it has some additional features that might be useful. – Vijay May 13 '11 at 5:53 ...
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Which is the best library for XML parsing in java [closed]

...under hibernation. I haven't evaluated dom4j by myself but just wanted to know - Does java has other (Good) open source xml parsing libraries? and how's your experience with dom4j? ...
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Why is Java's SimpleDateFormat not thread-safe? [duplicate]

...t fall into the 97%, where "we should forget about small inefficiencies"? Now, I've seen folks, with custom web frameworks, wrapping controller in a synchronized block, and thus all access beyond including database calls, business logic - and then spending a huge effort on performance testing. No ...
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What is the difference between pylab and pyplot? [duplicate]

...This wording is no longer in the documentation. Use of the pylab import is now discouraged and the OO interface is recommended for most non-interactive usage. From the documentation, the emphasis is mine: Matplotlib is the whole package; pylab is a module in matplotlib that gets installed alongsid...
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ClickTools 拓展:为布局、标签等没有点击事件的组件添加点击事件 - App In...

...n be done using procedures also still I thought to add it to extension. Now it is possible to do long click of component. [size=15.008px] IMPORTANT If you register button or another clickable components then the built in .Click event will not work See here[color=var(--primary-high-or-second...
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What is an AngularJS directive?

... OK I have a better understanding now. One way to think about it is: 1. DSL's usually represent syntax trees 2. The HTML DOM is a DSL syntax tree but it's a rigid one: the tags are mostly rigidly designed and purposed, and not extensible. 3. AngularJS and th...
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What is correct content-type for excel files? [duplicate]

...licked, not get saved on desktop, or get opened embedded in a browser etc. Now obviously it all depends on how everything is configured for each user, but what's the best Content-Type and other settings to achieve just that most of the time? ...
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Tips for using Vim as a Java IDE? [closed]

I'm addicted to Vim, it's now my de facto way of editing text files. 7 Answers 7 ...
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Is it secure to store passwords as environment variables (rather than as plain text) in config files

... order of increasing strength) : No security. Plain text. Anyone that knows where to look, can access the data. Security by Obfuscation. You store the data (plaintext) someplace tricky, like an environment variable, or in a file that is meant to look like a configuration file. An attacker will...