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Why does this code using random strings print “hello world”?
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When an instance of java.util.Random is constructed with a specific seed parameter (in this case -229985452 or -147909649), it follows the random number generation algorithm beginning with that seed value.
Every Random constructed with the same...
Long list of if statements in Java
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Instead of a HashMap you can use a Java enum, which gives you a well defined set of commands instead of a mushy map. You could have a getter in the enum: Command getCommand(); or even implement exec() as an abstract method in the enum, which each instance impl...
Regexp Java for password validation
I'm creating a regexp for password validation to be used in a Java application as a configuration parameter.
15 Answers
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How do I use Node.js Crypto to create a HMAC-SHA1 hash?
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A few years ago it was said that update() and digest() were legacy methods and the new streamin...
Why aren't Java Collections remove methods generic?
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Josh Bloch and Bill Pugh refer to this issue in Java Puzzlers IV: The
Phantom Reference Menace, Attack of the Clone, and Revenge of The
Shift.
Josh Bloch says (6:41) that they attempted to generify the get method
of Map, remove method and some other, but "it simply did...
What is the default scope of a method in Java?
...e permissive than private scope.
More information:
http://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html
http://mindprod.com/jgloss/scope.html
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Groovy Shell warning “Could not open/create prefs root node …”
...egedit into the search field.
Navigate to path HKEY_LOCAL_MACHINE\Software\JavaSoft (Windows 10 seems to now have this here: HKEY_LOCAL_MACHINE\Software\WOW6432Node\JavaSoft)
Right click on the JavaSoft folder and click on New -> Key
Name the new Key Prefs and everything should work.
Alternativ...
Java 8: How do I work with exception throwing methods in streams?
... It's sad we have to do this instead of using our native exceptions.... oh Java, it gives and then takes away
– Erich
Feb 27 '15 at 21:29
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Split string into array of character strings
...led a negative lookahead. Checkout the documentation here: docs.oracle.com/javase/6/docs/api/java/util/regex/…
– Erwin
May 28 '14 at 8:51
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How do I undo 'git add' before commit?
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Of course, this is not a true undo, because if the wrong git add overwrote a previous staged uncommited version, we can't recover it. I tri...