Java - format double value as dollar amount

Question

I need to format the double "amt" as a dollar amount println("$" + dollars + "." + cents) such that there are two digits after the decimal.

What is the best way to go about doing so?

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) + "."); } 

Answer 1

Use NumberFormat.getCurrencyInstance():

double amt = 123.456;      NumberFormat formatter = NumberFormat.getCurrencyInstance(); System.out.println(formatter.format(amt)); 

Output:

$123.46