下列程序段的输出结果是______。 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 Obj2=new Test( ); System.out.println('a='+Obj1.a+'b='+Obj1.B); } }