格式化双Java的两位小数或货币答案

【问题标题】：Formatting two decimal places or currency of double Java格式化双Java的两位小数或货币
【发布时间】：2015-01-22 04:47:04
【问题描述】：

我想弄清楚如何将输出格式化为货币。由于我是 Java 的初学者，尽管我愿意接受所有建议，但我想要最简单的解决方案。

public static void main(String[] args) 
 {
    int numUnits;
    double price;
    String item;
    Scanner scan = new Scanner(System.in);

    // get the data
    System.out.println("How many units?");
    numUnits = scan.nextInt();

    System.out.println("What is the price?");
    price = scan.nextDouble();

    scan.nextLine();
    System.out.println("What is the name of the item?");
    item = scan.nextLine();

    //calculations
    double totalCost = numUnits * price;

    System.out.println(numUnits + " units of "+ item + " were purchased for $"+
    price + " each for a total cost of $" + totalCost);

   }

 }

【问题讨论】：

NumberFormat.getCurrencyInstance().format(totalCost)...

标签： java format double decimal currency

【解决方案1】：

您可以通过多种方式进行操作，您可以使用NumberFormat.getCurrencyInstance()，这将允许您根据当前的语言环境属性格式化值...

System.out.println(numUnits + " units of "+ item + " were purchased for $"+
price + " each for a total cost of $" + NumberFormat.getCurrencyInstance().format(totalCost));

您还可以通过首先获取对实例的引用来格式化 NumberFormat 以满足您的需要...

NumberFormat nf = NumberFormat.getCurrencyInstance();
// Customise format properties...

【讨论】：

【解决方案2】：

    double amount =500.0;
    NumberFormat currencyFormatter = NumberFormat.getCurrencyInstance(new Locale("en", "US"));
    System.out.println(currencyFormatter.format(amount));

您应该使用适当的语言环境来处理您要使用的任何货币

【讨论】：