package FinalizeTest;

public class Person {
    
    public Person(){
        System.out.println("person created");
    }

    @Override
    protected void finalize() throws Throwable {
        // TODO Auto-generated method stub
        System.out.println("gc ");
        throw new Exception("no effect");
    }
}

package FinalizeTest;

public class MainTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Person per = new Person();
        per = null;
        System.gc();
        System.out.println("hello world");

    }

}

输出为

person created
hello world
gc 

代码如上所示， 求解释为什么hello world会在gc之前输出？？