微软实习面试-删除一个JAVA文件的全部注释

 1 public void deleteAllComment(InputStream is) throws IOException {
 2         int i = is.read();
 3         while(i != -1) {
 4             char c = (char)i;
 5             if(c == ‘/‘) {
 6                 char j = (char)is.read();
 7                 if(j == ‘/‘) {
 8                     deleteThisLine(is);
 9                 } else if(j == ‘*‘) {
10                     deleteUntilEnd(is);
11                 }
12             } else if(c == ‘\‘‘ || c == ‘"‘) {
13                 echoString(is, c);
14             } else {
15                 System.out.print(c);
16             }
17             i = is.read();
18         }
19     }
20     
21     //删除以"//"开头的注释
22     private void deleteThisLine(InputStream is) throws IOException {
23         char i = (char)is.read();
24         char j = (char)is.read();
25         while(true) {
26             if(i == ‘\r‘ && j==‘\n‘) {
27                 break;
28             } else {
29                 i = j;
30                 j = (char)is.read();
31             }
32         }
33     }
34     
35     //删除以"/* */"表示的注释
36     private void deleteUntilEnd(InputStream is) throws IOException {
37         char i = (char)is.read();
38         char j = (char)is.read();
39         while(true) {
40             if(i == ‘*‘ && j==‘/‘) {
41                 break;
42             } else {
43                 i = j;
44                 j = (char)is.read();
45             }
46         }
47     }
48     
49     //原样输出单引号或者双引号中的内容
50     private void echoString(InputStream is, int start) throws IOException {
51         char end = (char)is.read();
52         while(end != start) {
53             System.out.print(end);
54             end = (char)is.read();
55         }
56     }