本文介绍了Java - 将双值格式化为美元金额的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
我需要将双amt"格式化为美元金额 println("$" + dollar + "." + cents)，以便小数点后有两位数.
I need to format the double "amt" as a dollar amount println("$" + dollars + "." + cents) such that there are two digits after the decimal.
这样做的最佳方法是什么?
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) + ".");
}
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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