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。
这样做的最佳方法是什么？
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) + ".");
}
最佳答案
使用 NumberFormat.getCurrencyInstance() :
double amt = 123.456;
NumberFormat formatter = NumberFormat.getCurrencyInstance();
System.out.println(formatter.format(amt));
输出:
$123.46
关于Java - 将双值格式化为美元金额，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13791409/