将0-999的整数转化为对应的英文

将0-999的整数转化为对应的英文

一、源代码：EnglishNumberFormatter.java

package cn.com.zfc.example;

import java.util.Scanner;

/**
 * 将0-999的整数转化为对应的英文
 * 
 * @author zfc
 *
 */
public class EnglishNumberFormatter {
    private static final String[] BITS = { "ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX", "SEVEN", "EIGHT,", "NINE",
            "TEN" };
    private static final String[] TEENS = { "ELEVEN", "TWELF", "THIRTEEN", "FOURTEEN", "FIFTEEN", "SIXTEEN", "SEVETEEN",
            "EIGHTEEN", "NIGHTEEN" };
    private static final String[] TIES = { "TWENTY", "THRITY", "FORTY", "FIFTY", "SIXTY", "SEVENTY", "EIGHTY",
            "NINETY" };

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Please type a number between 0 and 999: ");
        int num = scanner.nextInt();
        scanner.close();
        String english = toEnglish(num);
        System.out.println(english);
    }

    private static String toEnglish(int num) {
        if (num == 0) {
            return "Zero";
        }
        StringBuffer buffer = new StringBuffer();
        if (num >= 100) {
            buffer.append(pickHunder(num));
            if (num % 100 != 0) {
                buffer.append(" AND ");
            }
            num -= (num / 100) * 100;
        }
        boolean largerThan20 = false;
        if (num >= 20) {
            largerThan20 = true;
            buffer.append(pickTies(num));
            num -= (num / 10) * 10;
        }
        if (!largerThan20 && num > 10) {
            buffer.append(pickTeens(num));
            num = 0;
        }
        if (num > 0) {
            String bit = pickBits(num);
            if (largerThan20) {
                buffer.append(" ");
            }
            buffer.append(bit);
        }
        return buffer.toString();
    }

    private static String pickHunder(int num) {
        int hunder = num / 100;
        return BITS[hunder - 1] + " HUNDER";
    }

    private static String pickTies(int num) {
        int ties = num / 10;
        return TIES[ties - 2];
    }

    private static String pickTeens(int num) {
        return TEENS[num - 11];
    }

    private static String pickBits(int num) {
        return BITS[num - 1];
    }
}

二、运行效果