这段java代码，哪里不对，请各位帮着看看,新手，多多关照

Question

public class test{
public static void main(String[] args){
data one = new data();
one.a = 1;
one.b = 1.1;
one.c = false;
System.out.println(a);
System.out.println(b);
System.out.println(c);
}
}
class data{
int a;
double b ;
boolean c;
}

Answer 1

System.out.println(one.a);
System.out.println(one.b);
System.out.println(one.c);