Help in a part of a java code

Question

Can some 1 tell me what is wrong in this java code.
please
part of the code is
int counter = 0;
for(int i = 0;  i < 4; i++){
if(secret.charAt(i) == userGuess.charAt(i)){
     counter = i+1;
System.out.println("Exact Matches:"+counter);..........................

Answer 1

actually this is part of a game that i wrote.
the user enters a secret code secret (ABCDEF): abcd (say for eg)
next he enters his a guess code guess  (ABCDEF):acbd (say for eg)
now the program has to give an output exact match = 2.
a=a and d=d
the code i gave in the first place is a part to increase the value of the counter.
for some reason it goes off track
the above example gives a output
Enter Secret code (ABCDEF):abcd
Enter Guess code (ABCDEF):acbd
Exact Matches:4
Press any key to continue . . .
the answer should be 2.
the entire program in case you want to refer to.
public class MyProgram {
private String getSecretCode() {
          System.out.print("Enter Secret code (ABCDEF):");
          String secret = Keyboard.readInput();
          secret = secret.toUpperCase();
          return secret;
     private String getGuessCode(){
          System.out.print("Enter Guess code (ABCDEF):");
          String userGuess = Keyboard.readInput();
        userGuess = userGuess.toUpperCase();
        return userGuess;
     public void start() {
          String  secret = getSecretCode();
          String  userGuess = getGuessCode();
int counter = 0;
     for(int i = 0;  i < 4; i++){
     if(secret.charAt(i) == userGuess.charAt(i)){
     counter = i+1;
System.out.println("Exact Matches:"+counter);
}