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 = +Ob31.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