Help me pls! - Infinite loop!!

Question

Dear Guys,
I am totally lost in my codes, pls help, TQ:
import java.io.*;
public class opReadLine {
     public opReadLine() {} //class constructor
     public static void main(String args[]) {
          FileReader inFile;
          BufferedReader inData;
          try {
               inFile = new FileReader("test.cfg");
               inData = new BufferedReader(inFile);
               String temp = inData.readLine();
               do {
                    System.out.println("The UID is: " + temp);
               } while (temp != "END");
               inData.close();
          catch (IOException ie) {
          ie.printStackTrace();
Content of "test.cfg":
END
note: there is no blank line above "END"!!
Rgds,
Daniel

Answer 1

Sorry I forgot to state the problem I am facing and the code I actually wanted.
I want my code to read from a file line by line until it meets the word "END".
However, I found there is a big syntax problem in:
do {
} while (temp != "END");
The result for the code above is infinite loop of System.out.println("The UID is: " + temp);
However,
when I changed the code to:
do {
} while (temp == "END");
it will execute "System.out.println(The UID is: " + temp) once and stops.
In other words, the code recognizes END, but why when I try to compare with !=, it gives me problem??
Pls help! TQ