第1章 Java IO系统 下

作业

编码加密

package ch0320hw;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

public class Encoding {

    public static void main(String[] args) {
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("请输入,直到quit结束");
        String line = null;
        char[] ch = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
                't', 'u', 'v', 'w', 'x', 'y', 'z' };
        char[] ch1 = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S',
                'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
        try {
            while (!"quit".equals(line = in.readLine())) {
                StringBuffer sb = new StringBuffer(line);
                for (int i = 0; i < sb.length(); i++) {
                    for (int j = 0; j < ch.length; j++) {

                        if (sb.charAt(i) == ch[j]) {
                            sb.setCharAt(i, ch[(j + 13) % 26]);
                            break;
                        }
                        if (sb.charAt(i) == ch1[j]) {
                            sb.setCharAt(i, ch1[(j + 13) % 26]);
                            break;
                        }
                    }
                }
                System.out.println(sb);

            }
            in.close();
            out.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println("结束................");

    }

}