FileInputStream close() Method in Java with Examples
Last Updated :
01 Dec, 2021
FileInputStream class is helpful to read data from a file in the form of a sequence of bytes. FileInputStream is meant for reading streams of raw bytes such as image data. For reading streams of characters, consider using FileReader.
FileInputStream.close() method
After any operation to the file, we have to close that file. For that purpose, we have a close method. We will learn that in this article. The FileInputStream.close() method closes this file input stream and releases any system resources associated with the stream.
Syntax:
FileInputStream.close()
Return Value: The method does not return any value.
Exception: IOException − If any I/O error occurs.
How to invoke the close() method?
Step 1: Attach a file to a FileInputStream as this will enable us to close the file as shown below as follows:
FileInputStream fileInputStream =new FileInputStream(“file.txt”);
Step 2: To close the file, we have to call the close() method using the above instance.
fileInputStream.close();
Approach:
1. We will first read a file and then close it.
2. After closing a file, we will again try to read it.
Java
import java.io.File;
import java.io.FileInputStream;
public class abc {
public static void main(String[] args)
{
File file = new File( "file.txt" );
try {
FileInputStream input
= new FileInputStream(file);
int character;
while ((character = input.read()) != - 1 ) {
System.out.print(( char )character);
}
input.close();
System.out.println( "File is Closed" );
System.out.println(
"Now we will again try to read" );
while ((character = input.read()) != - 1 ) {
System.out.print(( char )character);
}
}
catch (Exception e) {
System.out.println(
"File is closed. Cannot be read" );
e.printStackTrace();
}
}
}
|
Output
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File is Closed
Now we will again try to read
File is closed. Cannot be read
java.io.IOException: Stream Closed
at java.base/java.io.FileInputStream.read0(Native Method)
at java.base/java.io.FileInputStream.read(Unknown Source)
at abc.main(abc.java:28)
Note: This code will not run on an online IDE as it requires a file on the system.
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