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“Comparison method violates its general contract!”
...ent value when comparing objects. For example, you might want to perform a string compare and force empty strings to sort to the end with:
if ( one.length() == 0 ) {
return 1; // empty string sorts last
}
if ( two.length() == 0 ) {
return -1; // empty stri...
How do I display the current value of an Android Preference in the Preference summary?
...public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
Preference pref = findPreference(key);
if (pref instanceof ListPreference) {
ListPreference listPref = (ListPreference) pref;
pref.setSummary(listPref.getEntry());
}
}
This is easi...
Where IN clause in LINQ [duplicate]
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this will compare string values, but what about ids??
– Jitendra Pancholi
Feb 22 '13 at 7:32
...
Uppercase or lowercase doctype?
...110, in XML it is production 28. In both cases it is declared as the fixed string "DOCTYPE" (which is not a tag, it is a keyword). So in the canonical definitions in the respective SGML and XML standards it is always uppercase. If you find software that permits a lowercase "doctype" that software is...
How can I convert spaces to tabs in Vim or Linux?
...k for all your text, not only spaces in the begin of the line. That mean a string like: "Hey,␣this␣␣␣␣is␣4␣spaces" will become "Hey,␣this⇥is␣4␣spaces", but its not! its a tab!.
To settle this little problem I recomend a search, instead of retab.
:%s/^\(^I*\)␣␣␣␣/\1^I/g
...
What is the ellipsis (…) for in this method signature?
...nside the method is as if it were an array:
public void PrintWithEllipsis(String...setOfStrings) {
for (String s : setOfStrings)
System.out.println(s);
}
This method can be called as following:
obj.PrintWithEllipsis(); // prints nothing
obj.PrintWithEllipsis("first"); // prints "firs...
What does the plus sign do in '+new Date'
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A JavaScript date can be written as a string:
Thu Sep 10 2015 12:02:54 GMT+0530 (IST)
or as a number:
1441866774938
Dates written as numbers, specifies the number of milliseconds since January 1, 1970, 00:00:00.
Coming to your question it seams that by addin...
any tool for java object to object mapping? [closed]
...re:
Commons-BeanUtils: ConvertUtils -> Utility methods for converting String scalar values to objects of the specified Class, String arrays to arrays of the specified Class.
Commons-Lang: ArrayUtils -> Operations on arrays, primitive arrays (like int[]) and primitive wrapper arrays (like In...
How can I get System variable value in Java?
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Use the System.getenv(String) method, passing the name of the variable to read.
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Conversion from Long to Double in Java
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Don't need any string parsing there: Long.valueOf(15552451L).doubleValue() if you want to go via Long. Note this is the same, internally, as the cast from a double, except that you're doing some auto/unboxing.
– Joe Ke...