考虑: public class Trees {
Trees t;
public static void main(String[] args) {
Trees t = new Trees();
Trees t2 = t.go(t);
t2 = null;
// more code here : LINE 11
}
public class Dog
{
int collarID;
String name;
public static void main(String[] args){
Dog d = new Dog();
d.name="hose";
System.out.print(d.hashCode());
}