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 Objl=new Test(12,45); System.out.println("a="+objl.a+" b="+Objl.b); Test Obj2=new Test(); System.out.println("a="+Obj2.a+" b="+Obj2.b);