[code="java"]
public class ReferenceTest {
public static void main(String[] args) {
Obj o=new Obj("weak");
WeakReference weak=new WeakReference(o);
o=null;
System.gc();
System.out.println(weak.get());
}
}
class Obj{
private final String name;
Obj(String name){
this.name=name;
}
@Override
protected void finalize() throws Throwable {
System.out.println("执行finalize方法："+name);
super.finalize();
}
@Override
public String toString() {
return name;
}
}
[/code]
上述代码的输出结果是什么？为什么？
