去掉comments

/* Test program */

int main()

{

// variable declaration

int a, b, c;

/* This is a test

multiline

comment for

testing */

a = b + c;

}

import java.util.*;
public class removeComments{
public static void main(String [] args){
String file = "   /* Test program */ \n" +
"   int main()  \n" +
"   {           \n" +
"      // variable declaration \n" +
"      int a, b, c;    \n" +
"      /* This is a test  \n" +
"          multiline     \n" +
"          comment for   \n" +
"          testing */      \n" +
"      a = b + c;       \n" +
"   }           \n";
System.out.println(file);
System.out.println(removeComments(file));
}

private static String removeComments(String s){
if(s == null || s.length() == 0){
return s;
}
StringBuilder res = new StringBuilder();
boolean sCom = false;
boolean mCom = false;

for(int i = 0; i<s.length(); i++){
// System.out.println("i is " + i + "sCom, mCom  = " + sCom + mCom);
if(sCom && (s.charAt(i) == '\n')){
System.out.println("i is " + i);
sCom = false;
}else if(mCom && s.charAt(i) == '*' && i+1<s.length() && s.charAt(i+1) == '/'){
mCom = false;
i++;
}else if(sCom || mCom){
continue;
}else if(s.charAt(i) == '/' && i+1 < s.length() && s.charAt(i+1) == '/'){
sCom = true;
i++;
}else if(s.charAt(i) == '/' && i+1 <s.length() && s.charAt(i+1) == '*'){
mCom = true;
i++;
}else{
res.append(s.charAt(i));
}
}
return res.toString();
}

}