gistfile1.java

import java.text.DecimalFormat;

class F { 
    public static void main( String ... args ) { 
        DecimalFormat f = new DecimalFormat("000,000.00");
        double [] d = { 
            0.01,
            0.12,
            123456,
            123456.78,
            1234,
            1234.56 
        };
 
        String [] expected  = { 
            "______._1", 
            "______.12", 
            "123,456.__", 
            "123,456.78", 
            "__1,234.__", 
            "__1,234.56" 
        };

        for( int i = 0; i < d.length ; i++ ) { 
            assert f.format( d[i] ).replaceAll("0","_").replaceAll("_,_","__").equals( expected[i] );
        }
    }
}
// test it with java -ea F

if d[i]=123056 then the output should be 123,056.00 not 123,56._