web development helpdesk

Either use the format() method of the SimpleDateFormat class, or the (static) format() method of the String class.

DateFormat dateFormat = new SimpleDateFormat("hhmmddMMyy");
Date today = new Date();
String formatted = dateFormat.format(today);
String formatted2 =
   String.format("%<tH%<tM%<tS%tY%<tm%<td", today);

written by objects \\ tags: convert, date, format, string

That’s a job for the BigDecimal class

public static String formatToSignificant(double value,
   int significant)
{
   MathContext mathContext = new MathContext(significant,
      RoundingMode.DOWN);
   BigDecimal bigDecimal = new BigDecimal(value,
      mathContext);
   return bigDecimal.toPlainString();
} 

written by objects \\ tags: BigDecimal, format

Create an instance of DecimalFormat with the required format and use its format() method to format the double value. See the DecimalFormat javadoc for details on specifying format.

double d = 1.23456789;

// Use 2 decimal places

NumberFormat numberFormat =
   new DecimalFormat("#.##");

String s = numberFormat.format(d);
System.out.println(s);   // Outputs: 1.23 

written by objects \\ tags: double, format, string