Java.io.FileInputStream.finalize() Method

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Description

The java.io.FileInputStream.finalize() method ensures that the close method of this file input stream is called when there are no more references to it.

Declaration

Following is the declaration for java.io.FileInputStream.finalize() method −

protected void finalize()

Parameters

NA

Return Value

This method does not return any value.

Exception

IOException − If an I/O error occurs.

Example

The following example shows the usage of java.io.FileInputStream.finalize() method.

package com.tutorialspoint;

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 {
      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();
      }
   }
}

Assuming we have a text file c:/test.txt, which has the following content. This file will be used as an input for our example program −

ABCDE

Let us compile and run the above program, this will produce the following result −

Error: read() invoked after finalize()