Java.io.File.valid() Method

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Description

The java.io.File.valid() method tests if file descriptor object is valid.

Declaration

Following is the declaration for java.io.File.valid() method:

public boolean valid()

Parameters

  • NA

Return Value

The method returns true if the file descriptor object is valid, else the method returns false.

Exception

  • NA

Example

The following example shows the usage of java.io.File.valid() method.

package com.tutorialspoint;

import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.IOException;

public class FileDemo {
   public static void main(String[] args) throws IOException {
      
      FileInputStream fis = null;
      FileDescriptor fd = null;
      boolean bool = false;   
      
      try{
         // create input stream
         fis = new FileInputStream("c:/java test.txt");
         
         // get file descriptor
         fd = fis.getFD();
         
         // tests file descriptor object's validity
         bool = fd.valid();
         
         // print
         System.out.print("is file descriptor valid?: "+bool);
         
      }catch(Exception e){
         // if any error occurs
         e.printStackTrace();
      }finally{
         // releases systems resources
         if(fis!=null)
            fis.close();   
      }
   }
}

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

is file descriptor valid?: true



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