source: doc/theses/rob_schluntz_MMath/examples/intro/FileOutputStream.java @ c588acb

import java.io.IOException;
import java.io.FileNotFoundException;

public class FileOutputStream implements AutoCloseable {
        public static int throwOnWrite;
        public static int throwOnClose;
        public static int throwOnOpen;

        public static int numWrites;
        public static int numCloses;
        public static int numOpens;

        private String filename;
        private <EX extends Throwable> void doexcept(EX ex, boolean pred) throws EX {
                if (pred) {
                        System.out.println("Stream: " + filename + " threw exception: " + ex);
                        throw ex;
                }
        }

        public FileOutputStream(String filename) throws FileNotFoundException {
                doexcept(new FileNotFoundException(), throwOnOpen == ++numOpens);
                System.out.println("Opened file: " + filename);
                this.filename = filename;
        }
        public void write(byte[] bytes) throws IOException {
                doexcept(new IOException(), throwOnWrite == ++numWrites);
                System.out.println("wrote message: " + new String(bytes) + " to file: " + filename);
        }
        public void close() throws IOException {
                System.out.println("Closing file: " + filename);
                filename = null;
                doexcept(new IOException(), throwOnClose == ++numCloses);
        }
        protected void finalize() {
                if (filename != null) System.out.println("Finalize closing file: " + filename);
        }
}