Retain formatting of a Double value - Java

Question

I am using Poi to create Excel workbooks in Java. My raw data comes in as a string. I need to format the data to enter two decimal places into the cell where the number is bei

Answer 1

I always want two decimals.

Solution: Always apply specific decimal format pattern.

Sample code snippet:

//java.text.DecimalFormat df = new java.text.DecimalFormat( "###0.00" );  
java.text.DecimalFormat df = new java.text.DecimalFormat();  
df.applyPattern( "###0.00" ); // always two decimals  

double dbl = 1.50d ;  

// prints: dbl =  1.5
System.out.println( "dbl = " + dbl );  

// prints: df.format( 1.5 ) = 1.50
System.out.println ( "df.format( " + dbl + " ) = " + df.format( dbl ) );

UPDATE:
OK, from your posting, I understand that you are trying to fill the numeric formatted cell only to print or show up with two decimal positions. You know by default all numeric fields are interpreted omitting trailing zeros. To achieve your requirement, you may require to use CellFormat and/or DataFormatter on your contextual Cell object, but when said Format, it is a String again.

I didn't try the following code but may help you.

DataFormatter dataFormatter = new DataFormatter();
dataFormatter.setDefaultNumberFormat( instanceOfDesiredDecimalFormat );  
// or  
// dataFormatter.setExcelStyleRoundingMode( instanceOfDesiredDecimalFormat );  

// apply this format on the cell you want
dataFormatter.formatCellValue( instanceOfNumericCellInContext );