《Java编程思想第四版》学习笔记13

//: Frog.java
// Testing finalize with inheritance
class DoBaseFinalization {
    public static boolean flag = false;
}
class Characteristic {
    String s;
    Characteristic(String c) {
        s = c;
        out.println(
                "Creating Characteristic " + s);
    }
    protected void finalize() {
        out.println(
                "finalizing Characteristic " + s);
    }
}
class LivingCreature {
    Characteristic p =
            new Characteristic("is alive");
    LivingCreature() {
        out.println("LivingCreature()");
    }
    protected void finalize() {
        out.println(
                "LivingCreature finalize");
// Call base-class version LAST!
        if(DoBaseFinalization.flag)
            try {
                super.finalize();
            } catch(Throwable t) {}
    }
}
class Animal extends LivingCreature {
    Characteristic p =
            new Characteristic("has heart");
    Animal() {
        out.println("Animal()");
    }
    protected void finalize() {
        out.println("Animal finalize");
        if(DoBaseFinalization.flag)
            try {
                super.finalize();
            } catch(Throwable t) {}
    }
}
class Amphibian extends Animal {
    Characteristic p =
            new Characteristic("can live in water");
    Amphibian() {
        out.println("Amphibian()");
    }
    protected void finalize() {
        out.println("Amphibian finalize");
        if(DoBaseFinalization.flag)
            try {
                super.finalize();
            } catch(Throwable t) {}
    }
}
public class Frog extends Amphibian {
    Frog() {
        out.println("Frog()");
    }
    protected void finalize() {
        out.println("Frog finalize");
        if(DoBaseFinalization.flag)
            try {
                super.finalize();
            } catch(Throwable t) {}
    }
    public static void main(String[] args) {
        if(args.length != 0 &&
                args[0].equals("finalize"))
            DoBaseFinalization.flag = true;
        else
            out.println("not finalizing bases");
        new Frog(); // Instantly becomes garbage
        out.println("bye!");
// Must do this to guarantee that all
// finalizers will be called:
        System.runFinalizersOnExit(true);
    }
} ///:~

P.201的这段代码中，System.runFinalizersOnExit(true)已废弃，有没有替代函数可用，网上找了半天无果，哪位大神愿指点一二。谢谢！