java - 在 Java 中将数字转换为单词。有没有更简单、更有效的方法呢？

Question

大家好，我正在尝试使用控制结构编写一个简单的程序，将数字转换为单词，但程序变得太长了。有没有更简单的写法？例如，如果用户输入 123，则输出应为一二三。我没有完成它，但这里有一个示例:

import java.util.Scanner;
public class Number10 {

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    String num;

    System.out.print("Enter a number and i'll convert it to words: ");
    num = input.nextLine();

    if((num.length()) == 1)
    {
        switch(num)
        {
        case "0":
        {
            System.out.print("Zero");
            break;
        }
        case "1":
        {
            System.out.print("One");
            break;
        }
        case "2":
        {
            System.out.print("Two");
            break;
        }
        case "3":
        {
            System.out.print("Three");
            break;
        }
        case "4":
        {
            System.out.print("Four");
            break;
        }
        case "5":
        {
            System.out.print("Five");
            break;
        }
        case "6":
        {
            System.out.print("Six");
            break;
        }
        case "7":
        {
            System.out.print("Seven");
            break;
        }
        case "8":
        {
            System.out.print("Eight");
            break;
        }
        case "9":
        {
            System.out.print("Nine");
            break;
        }
        default:
        {
            System.out.print("Please enter a number");
            break;
        }
        }
 }
    else if((num.length()) == 2)
    {
        switch(num)
        {
        case "11":
        {
            System.out.print("One One");
            break;
        }
        case "12":
        {
            System.out.print("One Two");
            break;
        }
        case "13":
        {
            System.out.print("One Three");
            break;
        }
        case "14":
        {
            System.out.print("One Four");
            break;
        }
        case "15":
        {
            System.out.print("One Five");
            break;
        }
        case "16":
        {
            System.out.print("One Six");
            break;
        }
        case "17":
        {
            System.out.print("One Seven");
            break;
        }
        case "18":
        {
            System.out.print("One Eight");
            break;
        }
        case "19":
        {
            System.out.print("One Nine");
            break;
        }
        case "20":
        {
            System.out.print("Two Zero");
            break;
        }
        case "21":
        {
            System.out.print("Two One");
            break;
        }
        case "22":
        {
            System.out.print("Two Two");
            break;
        }
        case "23":
        {
            System.out.print("Two Three");
            break;
        }
        case "24":
        {
            System.out.print("Two Four");
            break;
        }

        default:
        {
            System.out.print("Please enter a number");
            break;
        }
        }
    }

    else
    {
        System.out.print("Invalid number");
    }

}

}

请帮帮我。谢谢。

Answer 1

我会这样做:

import java.util.Scanner;
public class Number10 {

private static String[] nums = new String[]
        {"Zero", "One", "Two", "Three", "Four",
         "Five", "Six", "Seven", "Eight", "Nine"};

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    String num;

    System.out.print("Enter a number and i'll convert it to words: ");
    num = input.nextLine();
    input.close()

    for (Character c: num.toCharArray())
        System.out.print(nums[Character.getNumericValue(c)]+ ' ');

}