public class Finalize1 {
        private static final int testIter = 100;
                
        static public void main(String[] args) {
                int n;
                //Initialize a batch of objects that use Finalize to clean up
                for (n=testIter; --n>=0;) {
                        UsesFinalize uf = new UsesFinalize();
                }

                //Initialize a batch of objects that use an explicit close
                //to clean up.  Note that the code is more complex.  This 
                //is a necessary evil.
                for (n=testIter; --n>=0;) {
                        UsesClose uf = null; 
                        try {
                                uf = new UsesClose();
                        }
                        finally {
                                if (uf != null)
                                        uf.close();
                        }
                }
                System.out.println("This demo demonstrates the danger of relying on finally to expediently close resources.");
                System.out.println("Testing with 100 resources:");
                
                //Each of the classes tracking the maximum number of "open" resources
                //at any given time.            
                System.out.println("Using Finalize to close resources required " 
                                                        + UsesFinalize.maxActive +
                                                        " open resources.");   
                System.out.println("Using explicit close required " 
                                                        + UsesClose.maxActive +
                                                        " open resource.");     
        }
        
        static public class UsesFinalize {
                static int active;
                static int maxActive;
                
                UsesFinalize() {
                        active++;
                        maxActive = Math.max(active, maxActive);
                }
                
                public void finalize() {
                        active--;
                }
        }
        
        static public class UsesClose {
                static int active;
                static int maxActive;
                
                public UsesClose() {
                        active++;
                        maxActive = Math.max(active, maxActive);
                }
                
                public void close() {
                        active--;
                }
        }
}