Java - 格式双值作为美元金额 [英] Java - format double value as dollar amount

问题描述

我需要将双amt格式化为美元金额println（$+美元+。+美分），以便小数点后面有两位数字。

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

最好的方式是这样做？

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) + ".");
}

推荐答案

使用 NumberFormat.getCurrencyInstance（）：

double amt = 123.456;    

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

输出：

$123.46

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