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java Programming Glossary: valWhat is the point of the class Option[T]? http://stackoverflow.com/questions/2079170/what-is-the-point-of-the-class-optiont either Some Person or None def main argv Array String Unit val p getPerson1 if p null p.display getPerson2 match case Some.. then why does Scala complicate things by introducing a new value wrapper Option T instead of following a simple approach used.. to never ever use get . That's because get is the equivalent of ok send me back to null land . So take that example of..
Populating child dropdownlists in JSP/Servlet http://stackoverflow.com/questions/2263996/populating-child-dropdownlists-in-jsp-servlet three dropdownlist controls named dd1 dd2 and dd3 . The value of each dropdownlist comes from database. dd3 's value depends.. The value of each dropdownlist comes from database. dd3 's value depends upon value of dd2 and dd2 's value depends on value.. comes from database. dd3 's value depends upon value of dd2 and dd2 's value depends on value of dd1 . Can anyone..
Can an abstract class have a constructor? http://stackoverflow.com/questions/260666/can-an-abstract-class-have-a-constructor this.multiplyBy multiplyBy public int mutiply int val return muliplyBy val class TimesTwo extends Product public TimesTwo.. multiplyBy public int mutiply int val return muliplyBy val class TimesTwo extends Product public TimesTwo super 2 class.. TimesTwo has a default constructor that just hardcodes the value 2. The concrete class TimesWhat has a constructor that allows..
create java console inside the panel http://stackoverflow.com/questions/342990/create-java-console-inside-the-panel current line private byte oneByte array for write int val INSTANCE CONSTRUCTORS INIT CLOSE FINALIZE public TextAreaOutputStream.. will hold. public synchronized void setMaximumLines int val maxLines val INSTANCE METHODS public void close if.. public synchronized void setMaximumLines int val maxLines val INSTANCE METHODS public void close if textArea null..
How to use java.String.format? http://stackoverflow.com/questions/3695230/how-to-use-java-string-format idx 1 throw new UnknownFormatConversionException String.valueOf c From this I understand that char is forbidden. If so.. are correct they're all in Java. Here's a Scala example val placeholder Hello s isn't s cool val formatted placeholder.format.. a Scala example val placeholder Hello s isn't s cool val formatted placeholder.format Ivan Scala I also have a blog post..
Best way to represent a fraction in Java? http://stackoverflow.com/questions/474535/best-way-to-represent-a-fraction-in-java sign will be carried on numerator regardless of how the values were passed in. public BigFraction BigInteger numerator BigInteger.. long numerator long denominator this BigInteger.valueOf numerator BigInteger.valueOf denominator public BigFraction.. denominator this BigInteger.valueOf numerator BigInteger.valueOf denominator public BigFraction long numerator this BigInteger.valueOf..
How to mark JTable cell input as invalid? http://stackoverflow.com/questions/7531513/how-to-mark-jtable-cell-input-as-invalid to mark JTable cell input as invalid If I take a JTable and specify a column's classtype on it's.. Then whenever a user tries to enter a double value into the table Swing automatically rejects the input and sets.. I've got this @Override public void setValueAt Object val int rowIndex int columnIndex if val instanceof Number Number..
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