testcake.java

java课件

/** TestCake.java */
 
public class TestCake {
  public static void main(String[] args){
    Cake a1 = new Cake(1);
    Cake a2 = new Cake(2);
    Cake a3 = new Cake(3);
    
    a3 = a2 =null;
    System.gc();
  }
}

class Cake extends Object {
  int id;
  
  public Cake(int id){
    this.id = id;
    System.out.println("创建Cake-"+id);
  }
  
  public void finalize() throws Throwable{
    System.out.println("释放Cake-"+id);
  }
}