1Z0-809 Question #141: Real Exam Question with Answer & Explanation

Given:

class MyField {
 int x, y;
 public void doStuff(int x, int y) {
 this.x = x;
 this.y = y;
 }
 public void display() {
 System.out.println(x + ":" + y + " ");
 }
 public static void main(String[] args) {
 MyField m1 = new MyField();
 m1.x = 100;
 m1.y = 200;
 MyField m2 = new MyField();
 m2.doStuff(m1.x, m1.y);
 m1.display();
 m2.display();
 }
}

What is the result?