How to check if a double is null?

Firstly, a Java double cannot be a Java null, and cannot be compared with null. (The double type is a primitive (non-reference) type and primitive types cannot be null.) I’m therefore assuming the following: The “null” you are trying to detect is a NULL stored in the database that you are querying. You are using … Read more

Converting a double to an int in C#

Because Convert.ToInt32 rounds: Return Value: rounded to the nearest 32-bit signed integer. If value is halfway between two whole numbers, the even number is returned; that is, 4.5 is converted to 4, and 5.5 is converted to 6. …while the cast truncates: When you convert from a double or float value to an integral type, … Read more

Double division behaving wrongly

You’re performing an integer division and then type casting: tf = (double) ( word.getValue() / noOfTerms ); ^—–integer division—-^ Type cast one of the elements in the division to convert into a floating point division: tf = ((double)word.getValue()) / noOfTerms;

problem formatting fields in a JTable – differences between Integer and Double

how did Walter Laan says in his thread Never give up! Never surrender! EDIT: I can’t resist, but due to my poor English I dare not to commenting why, where and how is that possible, nor works correctly, for confirmations I added Rob’s two (little bit) modified class for TableColumnRendering …, import java.awt.EventQueue; import java.math.RoundingMode; … Read more