读程序,写出正确的运行结果。(5分)
class A{
class Dog{
private String name;
private int age;
public int step;
Dog(String s,int a) {
name=s;
age=a;
step=0;
}
public void run(Dog fast) {
fast.step++;
}
}
public static void main (String args[]){
A a=new A();
Dog d=a.new Dog("Tom",3);
d.step=25;
d.run(d);
System.out.println(d.step);
}
}
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