Ich muss die doppelte "amt" als Dollar Betrag println ("$" + Dollar + "." + Cent) so formatieren, dass es zwei Nachkommastellen gibt.Java - Format Doppelwert als Dollarbetrag
Was ist der beste Weg, dies zu tun?
if (payOrCharge <= 1)
{
System.out.println("Please enter the payment amount:");
double amt = keyboard.nextDouble();
cOne.makePayment(amt);
System.out.println("-------------------------------");
System.out.println("The original balance is " + cardBalance + ".");
System.out.println("You made a payment in the amount of " + amt + ".");
System.out.println("The new balance is " + (cardBalance - amt) + ".");
}
else if (payOrCharge >= 2)
{
System.out.println("Please enter the charged amount:");
double amt = keyboard.nextDouble();
cOne.addCharge(amt);
System.out.println("-------------------------------");
System.out.println("The original balance is $" + cardBalance + ".");
System.out.println("You added a charge in the amount of " + amt + ".");
System.out.println("The new balance is " + (cardBalance + amt) + ".");
}
Look at ** String.format() **, durch die Art und Weise doppelt keine gute Art ist Währungsbeträge zu halten, verwenden BigDecimal statt. –
Duplizieren? - http://stackoverflow.com/questions/153724/how-to-round-a-number-to-n-decimal-places-in-java – mawaldne