Java内存释放——《Thinking in Java》随笔004

package cn.skyfffire;

/**
 * 
 * @author skyfffire
 *
 */
public class Test {
    static boolean gcrun = false;        // GC是垃圾回收器
    static boolean f = false;            // 终止创建对象的条件
    static int created = 0;                // 对象个数计数器
    static int finalized = 0;            // 对象销毁
    int i;
    
    Test() {
        i = ++created;
        
        if (created == 47) {
            System.out.println("已经达到47个");
        }
    }
    
    protected void finalize() {
        if (!gcrun) {
            gcrun = true;
            
            System.out.println(created + "号对象创建完毕");
        }
        
        if (i >= 47) {
            System.out.println("47以上了");
            
            f = true;
        }
        
        finalized++;
        
        if (finalized >= created) {
            System.out.println("所有对象销毁完毕");
        }
    }
}

class Garbage {
    public static void main(String[] args) {
        if (args.length == 0) {
            System.err.println("请加上参数");
            
            return;
        }
        
        while (!Test.f) {
            new Test();
        }
        
        System.out.println(Test.created + "---" + Test.finalized);
        
        if (args[0].equals("before")) {
            System.out.println("gc");
            System.gc();
            System.out.println("runFinalization():");
            System.runFinalization();
        }
//        
//        if (args[0].equals("after")) {
////            System.runFinalizersOnExit(false);
//        }
    }
}