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Why not abstract fields?
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You can do what you described by having a final field in your abstract class that is initialised in its constructor (untested code):
abstract class Base {
final String errMsg;
Base(String msg) {
errMsg = msg;
}
abstract String ...
Regex how to match an optional character
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You can make the single letter optional by adding a ? after it as:
([A-Z]{1}?)
The quantifier {1} is redundant so you can drop it.
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Find the extension of a filename in Ruby
... portion of a Rails app. Different types of files are handled differently by the app.
4 Answers
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How to drop unique in MySQL?
...que key (rather than the column name). You find the name of the unique key by
mysql> SHOW CREATE TABLE fuinfo;
here you see the name of the unique key, which could be email_2, for example. So...
mysql> DROP INDEX email_2 ON fuinfo;
mysql> DESCRIBE fuinfo;
This should show that the i...
How to generate gcc debug symbol outside the build target?
...--strip-debug main
or
strip --strip-debug --strip-unneeded main
debug by debuglink mode:
objcopy --add-gnu-debuglink main.debug main
gdb main
You can also use exec file and symbol file separatly:
gdb -s main.debug -e main
or
gdb
(gdb) exec-file main
(gdb) symbol-file main.debug
For det...
Default behavior of “git push” without a branch specified
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You can control the default behavior by setting push.default in your git config. From the git-config(1) documentation:
push.default
Defines the action git push should take if no refspec is given on the command line, no refspec is configured in the remote, and...
How to create Android Facebook Key Hash?
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First create a keystore by going to Build --> Build Apk from your studio. provide a name and password etc. Store it as a .jks file at a folder easily accessible. Now copy the path and generate the key by replacing that path in the above mentioned...
How to split a string at the first `/` (slash) and surround part of it in a ``?
...ore than one elements, for example to all those implementing a class, just by changing the selector.
Demonstration (note that I had to select jQuery in the menu in the left part of jsfiddle's window)
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Intellij idea subversion checkout error: `Cannot run program “svn”`
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I solved this by uncheking the "Use command-line client" option from Subversion settings.
This works with version 1.6 and 1.7 only. See @Vic's answer for SVN version 1.8.
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Unable to Cast from Parent Class to Child Class
..., that actually is not true.
Let's take a revised start and try proving it by examples.
As we know in .net all castings have two broad categories.
For Value type
For Reference type (in your case its reference type)
Reference type has further three main situational cases in which any scenario c...