将单词的整数表示形式转换回字符串

Question

This is a homework assignment and I'm having trouble with my output. Everything works as expected except the Integer.toString() isn't giving me the result I want. It is still outputting just a bunch of numbers when I want them to be converted to the actual word. Here's the code and output:

    import java.io.*;

    public class NumStream extends OutputStream
    {
        public void write(int c) throws IOException
        {  
            StringBuffer sb = new StringBuffer();
            switch(c)
            {
                case ' ': sb.append(" ");
                    break;
                case '1': sb.append("One");
                    break;
                case '2': sb.append("Two");
                    break;
                case '3': sb.append("Three");
                    break;
                case '4': sb.append("Four");
                    break;                
                case '5': sb.append("Five");
                    break; 
                case '6': sb.append("Six");
                    break;
                case '7': sb.append("Seven");
                    break;
                case '8': sb.append("Eight");
                    break;     
                case '9': sb.append("Nine");
                    break; 
                case '0': sb.append("Zero");
                    break;
                default:  sb.append(Integer.toString(c));
                    break;
            }
            System.out.print(sb);
        }
        public static void main(String[] args) 
        {
            NumStream ns = new NumStream();
            PrintWriter pw = new PrintWriter(new OutputStreamWriter(ns));
            pw.println("123456789 and ! and # ");
            pw.flush();
        }
    }

the output is: OneTwoThreeFourFiveSixSevenEightNine 97110100 33 97110100 35 1310

can somebody please tell me how to format code easier in this forum? I had to manually 8 space indent each line and there's got to be an easier way!

Answer 1

For characters that aren't digits, you're taking the character code and converting it to a number. So 97 110 and 100 are the character codes for 'a', 'n', and 'd' while 33 and 35 are ! and # .

What you probably want for your default case is just:

default: sb.append((char)c); break;

Note that creating a new StringBuffer each time the write routine is called is extremely wasteful and inefficient. Since you're only ever appending one string/char to it, you might as well just print that string/char directly rather than copying through a StringBuffer.

Answer 2

您正在输出sb.append(Integer.toString(c))中不是数字的字符的ASCII码。