es.java

  class Qiu{
    int x,y,z;
    Qiu(int a){
        x=a;

    }
    
}

public class es{
    public static void main(String[] args){
        Xiyou sun;
        sun=new Xiyou();
        sun.y=10;
        System.out.println(sun.x);
         System.out.println(sun.y);
    }

}