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How do I define a method which takes a lambda as a parameter in Java 8?

In Java 8, methods can be created as Lambda expressions and can be passed by reference (with a little work under the hood). There are plenty of examples online with lambdas being created and used with methods, but no examples of how to make a method taking a lambda as a parameter. What is the syntax...
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Git - Undo pushed commits

I have a project in a remote repository, synchronized with a local repository (development) and the server one (prod). I've been making some commited changes already pushed to remote and pulled from the server. Now, I want to undo those changes. So I could just git checkout to the commit before th...
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UnicodeDecodeError: 'ascii' codec can't decode byte 0xef in position 1

I'm having a few issues trying to encode a string to UTF-8. I've tried numerous things, including using string.encode('utf-8') and unicode(string) , but I get the error: ...
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Difference between “on-heap” and “off-heap”

Ehcache talks about on-heap and off-heap memory. What is the difference? What JVM args are used to configure them? 6 Answ...
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The performance impact of using instanceof in Java

I am working on an application and one design approach involves extremely heavy use of the instanceof operator. While I know that OO design generally tries to avoid using instanceof , that is a different story and this question is purely related to performance. I was wondering if there is any per...
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How to get the client IP address in PHP [duplicate]

How can I get the client IP address using PHP? 30 Answers 30 ...
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How to get the name of enumeration value in Swift?

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What programming practice that you once liked have you since changed your mind about? [closed]

As we program, we all develop practices and patterns that we use and rely on. However, over time, as our understanding, maturity, and even technology usage changes, we come to realize that some practices that we once thought were great are not (or no longer apply). ...
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How to properly seed random number generator

I am trying to generate a random string in Go and here is the code I have written so far: 9 Answers ...
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How to capture the “virtual keyboard show/hide” event in Android?

...the layout based on whether the virtual keyboard is shown or not. I've searched the API and various blogs but can't seem to find anything useful. ...