三个double TO string对比

double amount11 =121145634541535.0;
BigDecimal bigDecimal = new BigDecimal(amount11);
BigDecimal db = bigDecimal.setScale(2, BigDecimal.ROUND_HALF_UP);
String str = db.toPlainString();
Locale locale = new Locale("en", "US");        
NumberFormat currencyFormatter = NumberFormat.getCurrencyInstance(locale);
System.out.println(str);
System.out.println(Double.toString(amount11));
System.out.println(currencyFormatter.format(amount11));


121145634541535.00
1.21145634541535E14
$121,145,634,541,535.00