下面程序段的输出结果为( )。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 Obj 1 = new Test(12,45 ); System.out.println( a= +Obj1.a+ b= +Obj1. b); Test Obj2 = new Test(); System.out.println( a= +Obj2.a+ b= +Obj2. b);
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