Java.io.FileInputStream.finalize() 方法

package com.codingdict;



import java.io.FileInputStream;

import java.io.IOException;



public class FileInputStreamAvailable extends FileInputStream {



   public FileInputStreamAvailable() throws Exception {

      super("C://test.txt");

   }



   public static void main(String[] args) throws IOException {

      FileInputStream fis = null;

      int i;

      char c; 



      try {



         // create new File input stream

         FileInputStreamAvailable fisa = new FileInputStreamAvailable();



         // read byte from file input stream

         i=fisa.read();



         // converts int to char

         c = (char)i;



         // prints character

         System.out.println(c);



         // finalize method invoked

         fisa.finalize();



         // method revoked after finalize metod

         i = fisa.read();

         c = (char)i;

         System.out.println(c);



      } catch(Exception ex) {



         // if any error occurs

         System.out.print("Error: read() invoked after finalize()");

      } finally {



         // releases all system resources from the streams

         if(fis!=null)

            fis.close();

      }

   }

}