package garbage;

/**

* 测试垃圾收集时finalize()方法被调用的情况

* 经测试发现有些对象的finalize()方法没有被调用

* @author Administrator

*

*/

public class Garbage{

static boolean stopCreate = false;

public static void main(String[] args) {

System.out.println(args[0]);

new Thread(){

public void run() {

try {

sleep(1);

} catch (InterruptedException e) {

e.printStackTrace();

}

stopCreate = true;

}

}.start();

while(!Chair.f && !stopCreate){

new Chair();

new String("To take up space");

}

System.out.println("After all Chairs have been created:\n"

+ "total created = " + Chair.created

+ ",total finalized = " + Chair.finalized);

if(args[0].equals("before")){

System.out.println("gc():");

System.gc();

System.out.println("runFinalizeation():");

System.runFinalization();

}

System.out.println("bye!");

if(args[0].equals("after")){

System.runFinalizersOnExit(true);

}

}

}

class Chair {

volatile static boolean gcrun;

volatile static boolean f;

volatile static int created = 0;

volatile static int finalized = 0;

int i;

Chair(){

i = ++ created;

if(created == 47){

System.out.println("Created 47");

}

}

@Override

protected void finalize(){

if(!gcrun){

gcrun = true;

}

System.out.println("Beginning to finlize " + i + " after "

+ created + " Chairs have been created");

if(i == 47){

System.out.println("Finalizing Chair #47, "

+ "Setting flag to stop Chair creation");

f = true;

}

finalized++;

if(finalized >= created){

System.out.println("All " + finalized + " finalized");

}

}

}