Develop code to compare object references using Boolean expressions and determine the result of these expressions.

What is printed as a result of executing this code segment?

public static void compareObjects() {
    Integer x = 127;
    Integer y = 127;
    Integer z = 128;
    Integer w = 128;
    
    String result = "";
    
    if (x == y) {
        result += "A";
    }
    if (x.equals(y)) {
        result += "B";
    }
    if (z == w) {
        result += "C";
    }
    if (z.equals(w)) {
        result += "D";
    }
    
    System.out.println(result);
}