关于以下程序代码的说明正确的是: 1. public class HasStatic{ 2. private static int x=100; 3. public static void main(String args[]){ 4. HasStatic hs1=new HasStatic(); 5. hs1.x++; 6. HasStatic hs2=new HasStatic(); 7. hs2.x++; 8. hs1=new HasStatic(); 9. hs1.x++; 10. HasStatic.x--; 11. System.out.println("x="+x); 12. } 13. }