public class person

{ int age;
int claw;
public static void main (String[] args)
{
person q1 = new person ();
person q2 = new person ();
q1.age = 10;
q2.age = q1.age + 20;
System.out.println("q1.age = " + q1.age);
System.out.println("q2.age = " + q2.age);
System.out.println("q2.age is " + cat.claw);

}
}
public class animal

{
int claw;
animal cat = new animal ();
cat.claw = 4;

}


我希望的结果是 10 30 4
但是什么也没发生