/*题目3:在d盘目录下有一个加密文件a.txt（文件里只有英文和数字），
密码是“heima”，当密码输入正确时才能读取文件里的数据。现要求用代码来模拟读取文件的过程，
并统计文件里各个字母出现的次数，并把统计结果按照“a：2个；b：3个；”的格式输出到d盘的count.txt中*/
public class Test3 {
public static void main(String[] args) throws IOException {
/*BufferedInputStream bi = new BufferedInputStream(new FileInputStream("D:\\a.txt"));
BufferedOutputStream bo = new BufferedOutputStream(new FileOutputStream("D:\\copy.txt"));
int b;
while((b = bi.read())!=-1){
bo.write(b^123);
}
bi.close();
bo.close();*/
Scanner sc = new Scanner(System.in);
System.out.println("请输入:");
while(true){
String s = sc.nextLine();
if (s.equals("黑马")) {
method1();
break;
}else{
System.out.println("输入错误,再来一次:");
}
}
}
public static void method1() throws FileNotFoundException, IOException {
BufferedInputStream bi = new BufferedInputStream(new FileInputStream("D:\\copy.txt"));
StringBuilder sb = new StringBuilder();
int b;
while((b=bi.read())!=-1){
sb.append((char)(b^123));
}
char[] arr = sb.toString().toCharArray();
Map<Character, Integer> map = new HashMap<>();
for (int i = 0; i < arr.length; i++) {
if (!map.containsKey(arr[i])) {
map.put(arr[i],1);
}else{
map.put(arr[i], map.get(arr[i])+1);
}
}
BufferedOutputStream bo = new BufferedOutputStream(new FileOutputStream("count.txt"));
for (Character c : map.keySet()) {
int i = map.get(c);
bo.write((c+":"+i+"个; ").getBytes());
}
bo.close();
}
}