json - Comparing two strings in android

Possible Duplicate:
Comparing two identical strings with == returns false

I am having real hard time with solving this code. This might look silly but I am not able to figure out what is happening. I am parsing a JSONArray(No big deal!) I am traversing the array with a for loop. I want to break the loop when the user input and the value matches. Here is my code

String regi = null;
JSONObject studentObject = null;
try {

JSONArray returned = test.getInternetData();
int i;
for (i = 0; i < returned.length(); i++) {
    studentObject = returned.getJSONObject(i);
    regi = studentObject.getString("REGISTRATION_NO");
    if (regi == reg) {
        name = studentObject.getString("STUDENT_NAME");
        break;
    }
}

course = studentObject.getString("COURSE_CODE");
Log.d("Details", name + course + regi + i);//Out put: nullGraduate081018394:name - null
//course: Graduate (same for all), regi: last registration number, 
//i: giving totalnumber of objects

As per my knowledge the loop should stop when it finds a match. The COURSE_CODE will be corresponding to the student. Am I missing something?

Please note: The function getInternetData() is returning the whole JSON Array. The loop is completely traversing every object.

Answer

Strings cannot be compared with == in Java. You have to use string1.equals(string2).