将数字翻译成英文

public class Demo {
    
    /*
     * Jessi初学英语，为了快速读出一串数字，编写程序将数字转换成英文：
     * 如22： twenty two ，123：one hundred and twenty three。
     * 
     * 注意事项：
     * 1、数字为正整数，长度不超过十位，不考虑小数，转化结果为英文小写；
     * 2、输出格式为twenty two；
     * 3、非法数据请返回“error”；
     * 4、关键词提示：and, billion，million， thousand， hundred 。
     * 
     * 输入参数：
     * 		long num 输入的数字，如1234
     * 返回值：
     * 		正常情况下返回数字对应的英文，如one thousand two hundred and thirty four
     */
	public static String parse(long num) {
        if(num >= 10000000000L || num  < 0L){
        	return "error";
        }
        StringBuffer sb = new StringBuffer();
        if(num >= 1000000000L){
        	sb.append(subParse1(num / 1000000000L));       	
        	sb.append(" billion");
        	if(num / 1000000000L > 1){
        		sb.append("s");
        	}
        	num = num % 1000000000L;
        }
        if(num >= 1000000L){
        	if(!sb.toString().equals("")){
        		sb.append(" ");
        	}
        	sb.append(subParse1(num / 1000000L));
        	sb.append(" million");
        	if(num / 1000000L > 1){
        		sb.append("s");
        	}
        	num = num % 1000000L;
        }
        if(num >= 1000L){
        	if(!sb.toString().equals("")){
        		sb.append(" ");
        	}
        	sb.append(subParse1(num / 1000L));
        	sb.append(" thousand");
        	if(num / 1000L > 1){
        		sb.append("s");
        	}
        	num = num % 1000L;
        }
        if(num > 0){
        	if(!sb.toString().equals("")){
        		sb.append(" ");
        	}
        	sb.append(subParse1(num));
        }else{
        	if(sb.toString().equals("")){
        		sb.append("zero");
        	}
        }
    	return sb.toString().trim();
    }
	/**
	 * 个数最多只有三位的读法
	 * @param num
	 * @return
	 */
	public static String subParse1(long num){
		Integer i = (int) num;
		
		String[] str0to19 = new String[]{
				"zero","one","two","three","four","five",
		        "six","seven","eight","nine","ten",
		        "eleven","twelve","thirteen","fourteen","fifteen",
		        "sixteen","seventeen","eighteen","nineteen"
		        };
		String[] str20to90 = new String[]{
				"twenty","thirty","forty","fifty","sixty","seventy","eighty","ninety"	
				};
		StringBuffer result = new StringBuffer();
		if(i >= 100){
			result.append(str0to19[i/100]);
			result.append(" hundred");
			if(i / 100 > 1){
				result.append("s");
        	}
			i = i % 100;
		}
		
		if(i >= 20){
			if(!result.toString().equals("")){
				result.append(" and ");
			}
			result.append(str20to90[i/10 - 2]);
			if(i % 10 != 0){
				result.append(" " + str0to19[i % 10]);
			}
		}else if(i > 0){
			if(!result.toString().equals("")){
				result.append(" and ");
			}
			result.append(str0to19[i]);
		}
		return result.toString().trim();
	}
}

评论

3 楼 weijs 2014-02-14  

System.out.println(Num2Word.parse(102));
System.out.println(Num2Word.parse(110));
System.out.println(Num2Word.parse(12545));

输出：
102
110
twelve thousands 545

2 楼 mfkvfn 2014-02-13  

有没有试一下 102,102,120这样的。

1 楼 O0o陈小贱o0O 2014-02-13