Class getDeclaredFields() method in Java with Examples

FileSystem isOpen() method in Java with Examples

Last Updated : 03 Dec, 2019

The isOpen() method of a FileSystem class is used to return true if file system is open. This method is very helpful to know filesystem is open or not. File systems created by the default provider are always open.

Syntax:

public abstract boolean isOpen()

Parameters: This method accepts nothing.

Return value: This method returns true if, and only if, this file system is open.

Below programs illustrate the isOpen() method:
Program 1:

// Java program to demonstrate 
// FileSystem.isOpen() method 
  
import java.nio.file.FileSystem; 
import java.nio.file.Path; 
import java.nio.file.Paths; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // create the object of Path 
        Path path 
            = Paths.get( 
                "C:\\Movies\\document.txt"); 
  
        // get FileSystem object 
        FileSystem fs = path.getFileSystem(); 
  
        // apply isOpen() methods 
        boolean answer = fs.isOpen(); 
  
        // print 
        System.out.println("isOpen: " + answer); 
    } 
} 

Output:

Program 2:

// Java program to demonstrate 
// FileSystem.isOpen() method 
  
import java.nio.file.FileSystem; 
import java.nio.file.Path; 
import java.nio.file.Paths; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // create the object of Path 
        Path path 
            = Paths.get( 
                "E:// Tutorials// file.txt"); 
  
        // get FileSystem object 
        FileSystem fs = path.getFileSystem(); 
  
        // apply isOpen() methods 
        boolean answer = fs.isOpen(); 
  
        // print 
        System.out.println(fs + " is Open: " + answer); 
    } 
} 

Output:

References: https://docs.oracle.com/javase/10/docs/api/java/nio/file/FileSystem.html#isOpen()

Class getDeclaredFields() method in Java with Examples

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