frog.java

java编程思想的部分实现

//:c07:Frog.java
class DoBaseFinalization
{
	public static boolean flag=false;
}
class Characteristic
{
	String s;
	Characteristic(String c)
	{
		s=c;
		System.out.println("Creating Charateristic "+s);
	}
	protected void finalize()
	{
		System.out.println("finalizing Charateristic "+s);
	}
}
class LivingCreature
{
	Characteristic p=new Characteristic("is alive");
	LivingCreature()
	{
		System.out.println("LivingCreature()");
	}
	protected void finalize() throws Throwable
	{
		System.out.println("LivingCreature finilize");
		if(DoBaseFinalization.flag)
		super.finalize();
	}
}
class Animal extends LivingCreature
{
	Characteristic p=new Characteristic("has heart");
	Animal()
	{
		System.out.println("Animal finalize");
		if(DoBaseFinalization.flag)
		super.finalize();
	}
}
class Amphibian extends Animal
{
	Characteristic p=new Characteristic("can live in water");
	Amphibian()
	{
		System.out.println("Amphibian()");
	}
	protected void finalize() throws Throwable
	{
		System.out.println("Amphibian finalize");
		if(DoBaseFinalization.flag)
		super.finalize();
	}
}
public class Frog extends Amphibian
{
	Frog()
	{
		System.out.println("Frog()");
	}
	protected void finalize() throws Throwable
	{
		System.out.println("Frog finalize");
		if(DoBaseFinalization.flag)
		super.finalize();
	}
	public static void main(String[] args)
	{
		if(args.length!=0&&args[0].equals("finalize"))
		DoBaseFinalization.flag=true;
		else
		System.out.println("Not finalizing bases");
		new Frog();
		System.out.println("Bye");
		System.gc();
	}
}