Question

I have a string array in an object which is storing a decimal value.

String [] array = "12345.123456789";

I want it to be formatted as 12345.1234

I tried it with the following but resulted in a Number Format Exception.

BigDecimal value = new BigDecimal(array.toString()).setScale( 4, BigDecimal.ROUND_HALF_UP );
array = ( Object )value.toString();

I am new to java so can anyone please help…

Answer 1

String [] array = "12345.123456789"; is not a valid statement – either it is a String or an array, so you need to choose between the following two statements:

String s = "12345.123456789"; //a string
String[] array = {"12345.123456789"}; //an array

If you use the first form, you can round it with:

BigDecimal rounded = new BigDecimal(s).setScale( 4, BigDecimal.ROUND_HALF_UP );
String roundedStr = rounded.toString();

If you use the second form, you can use this:

BigDecimal rounded = new BigDecimal(array[0]).setScale( 4, BigDecimal.ROUND_HALF_UP );
String roundedStr = rounded.toString();