Why does Java BigDecimal return 1E+1?

Question

Why does this code sometimes return 1E+1 whilst for other inputs (e.g. 17) the output is not printed in scientific notation?

BigDecimal bigDecimal = BigDecimal.valueOf(doubleValue).multiply(BigDecimal.valueOf(100d)).stripTrailingZeros(); System.out.println("value: " + bigDecimal); 

Answer 1

use bigDecimal.toPlainString():

 BigDecimal bigDecimal = BigDecimal.valueOf(100000.0)                      .multiply(BigDecimal.valueOf(100d))                      .stripTrailingZeros();  System.out.println("plain      : " + bigDecimal.toPlainString());  System.out.println("scientific : " + bigDecimal.toEngineeringString()); 

outputs:

 plain      : 10000000 scientific : 10E+6 

Answer 2

It's the implicit .toString() conversion that is happening when you pass the result into System.out.println().