BufferedReader loop in while

Question

Here's my code. I'm trying to read this text file:

AAA
BBB
CCC
DDD

In the code below, BufferedReader should stop at the line "DDD", but program goes in loop.

I tried to replace "DDD" with null and it worked, but I want it stop at the line I specified! I'm stucked in this issue and I don't know how to solve it... solution?

import java.io.*;

public class Reading{

public Reading() {}

    public static void main(String[] args) throws IOException{
        new Reading();

        BufferedReader br = new BufferedReader(new FileReader(new File("test.txt")));
        String line;

        while((line = br.readLine()) != "DDD"){
            System.out.println(line);
        }

        br.close();
    }
}