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Is it good practice to make the constructor throw an exception? [duplicate]
... a checked exception for this2.
However explicitly declaring or throwing java.lang.Exception is almost always bad practice.
You should pick an exception class that matches the exceptional condition that has occurred. If you throw Exception it is difficult for the caller to separate this exceptio...
How to change fontFamily of TextView in Android
...════╝
Here is the parser (based off FontListParser):
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import org.x...
How to get all enum values in Java?
... Value : %s ]%n",currency.name(),currency);
}
}
}
http://javaexplorer03.blogspot.in/2015/10/name-and-values-method-of-enum.html
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How to set a JVM TimeZone Properly
I am trying to run a Java program, but it is taking a default GMT timezone instead of an OS defined timezone. My JDK version is 1.5 and the OS is Windows Server Enterprise (2007)
...
Best way to create an empty map in Java
...Granted, no big benefits here compared to Collections.emptyMap(). From the Javadoc:
This map behaves and performs comparably to Collections.emptyMap(),
and is preferable mainly for consistency and maintainability of your
code.
2) Map that you can modify:
Maps.newHashMap()
// or:
Maps.<...
how to get the one entry from hashmap without iterating
...
If you are using Java 8, it is as simple as findFirst():
Quick example:
Optional<Car> theCarFoundOpt = carMap.values().stream().findFirst();
if(theCarFoundOpt.isPresent()) {
return theCarFoundOpt.get().startEngine();
}
...
How do I rename the android package name? [duplicate]
...r to rename test only. The same applies if I navigate to package name in .java or Manifest file and press Shift+F6.
...
java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
I'm using the support library for my app. In my FragmentActivity I'm using an AsyncTask for downloading data from internet. In the onPreExecute() method I add a Fragment and in the onPostExecute() method I remove it again. When the orientation is changed in between, I get the above mentioned excepti...
How to check if a String contains another String in a case insensitive manner in Java?
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Yes, contains is case sensitive. You can use java.util.regex.Pattern with the CASE_INSENSITIVE flag for case insensitive matching:
Pattern.compile(Pattern.quote(wantedStr), Pattern.CASE_INSENSITIVE).matcher(source).find();
EDIT: If s2 contains regex special character...
How to convert a char array back to a string?
...t this is a very unusual situation: Because String is handled specially in Java, even "foo" is actually a String. So the need for splitting a String into individual chars and join them back is not required in normal code.
Compare this to C/C++ where "foo" you have a bundle of chars terminated by a ...