java - 在 toString 中格式化我的货币输出

Question

除了格式错误之外，我的代码工作正常。例如它正在输出:当我需要输出 Teriyaki $.25 时，Teriyaki $0.25。唯一输出错误的是小数点前面的 0。其余的都是正确的。我怎样才能解决这个问题？这是我的代码:

import java.text.NumberFormat;

public class MenuItem 
{
private String name;
private double price;

public MenuItem (String name, double price)
{
    this.name = name;
    this.price = price;
}

public String getName()
{
    return name;
}

public double getPrice()
{
    return price;
}

public String toString()
{
    return (getName() + " " + NumberFormat.getCurrencyInstance().format(getPrice()));
}
}

测试代码为:

import java.util.Scanner;
import java.util.Vector;

public class sol
{
public static void main(String[] args)
{
    /* Read from keyboard */
    Scanner keys = new Scanner(System.in);
    /* Create dynamic list */
    Vector<MenuItem> list = new Vector<MenuItem>();
    /* While there is input waiting */
    while (keys.hasNext())
    {
        /* Prompt the user */
        System.out.println("Enter product name and price");
        /* Test the constructor */
        list.add(new MenuItem(keys.next(), keys.nextDouble()));
    }
    /* Test toString (implicitly called when passed to println) */
    System.out.println("Testing toString");
    for (MenuItem mi : list)        
        System.out.println(mi);
    /* Test getters */
    System.out.println("Testing getters");
    for (MenuItem mi : list)        
        System.out.println("Item: " + mi.getName() + " Price: " +   mi.getPrice()); 
    /* Close keyboard stream */
    keys.close();
}

}

谢谢

Answer 1

创建 DecimalFormat以您希望的方式构造十进制数字

    DecimalFormat twoDForm = new DecimalFormat("#.00");
    Double d = Double.parseDouble("0.25");
    String s = twoDForm.format(d);
    System.out.println(s);

格式中的#表示:

Digit, zero shows as absent

它将输出.25，但如果它非零，仍然显示前导数字