浅析final,finally,finalize 的区别

public class Person {
    private String name;
    private int age;

    public final void eat()
    {
        System.out.println("this is in person class");
    }

    public void eat(String name,int age)
    {

    }

}

public class Student extends Person {

    @Override
    public void eat(String name, int age) {
        // TODO Auto-generated method stub
        super.eat(name, age);
    }
}

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String toString()
    {
        return "姓名："+this.name+"，年龄："+this.age;
    }

    public void finalize() throws Throwable{//对象释放空间是默认调用此方法
        System.out.println("对象被释放-->"+this);//直接输出次对象，调用toString()方法
    }

}

public class SystemDemo {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Person per=new Person("zhangsan",30);
        per=null;//断开引用，释放空间
        //方法1：
        System.gc();//强制性释放空间
        //方法2：
//        Runtime run=Runtime.getRuntime();
//        run.gc();
    }

}