这段程序怎么运行？

Question

class B{int x=100,y=200;  //变量类型为整数类型public void setX(int x){  x=x;} public void setY(int y){ this.y=y;}public int getXYSum(){return x+y;}}public class A{ public static void main(String args[]){  B b=new B();  b.setX(-100);  b.setY(-200);System.out.println(“sum=”+b.getXYSum());}}

Answer 1

运行结果为-100，如果你setX里改成this.x=x，结果就变成-300.

Answer 2

-100