有如下程序 public class Test { int a,b; Test() { a=100; b=200; } Test(int x,int y) { a = x; b = y; } public static void main(String args[]) { Test Obj1=new Test(12,45); System.out.println("a = "Obj1.a+" b= "+Obj1.B) ; Test Obj1=new Test(); System.out.println("a = "Obj1.a+" b= "+Obj1.B) ; } } 程序的运行结果为( )。
A.a=100 b=200 a=12 b=45
B.a=12 b=45 a=100 b=200
C.a=12 b=200 a=100 b=45
D.a=100 b=45 a=12 b=200