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Java InputStreamReader ready() Method with Example

InputStreamReader Class ready() method: Here, we are going to learn about the ready() method of InputStreamReader Class with its syntax and example.
Submitted by Preeti Jain, on April 13, 2020

InputStreamReader Class ready() method

• ready() method is available in java.io package.
• ready() method is used to check whether this InputStreamReader is ready to be ready or not.
• ready() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• ready() method may throw an exception at the time of checking the state of the stream.
  IOException: This exception may throw when getting any input/output error while performing.

Syntax:

    public boolean ready();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is String, it returns true when this stream is ready to be read otherwise it returns false.

Example:

// Java program to demonstrate the example 
// of boolean ready() method of 
// InputStreamReader

import java.io.*;
public class ReadyOfISR {
 public static void main(String[] args) throws Exception {
  InputStream is_stm = null;
  InputStreamReader isr_stm = null;
  int val = 0;

  try {
   // Instantiates FileInputStream and InputStreamReader 
   is_stm = new FileInputStream("D:\\includehelp.txt");
   isr_stm = new InputStreamReader(is_stm);

   // By using ready() method is to         
   // check whether this stream isr_stm
   // stream is ready to be read or not

   boolean status = isr_stm.ready();
   System.out.println("isr_stm.ready(): " + status);

  } catch (Exception ex) {
   System.out.println(ex.toString());

  } finally {

   // with the help of this block is to
   // free all necessary resources linked
   // with the stream

   if (is_stm != null) {
    is_stm.close();

    if (isr_stm != null) {
     isr_stm.close();
    }
   }
  }
 }
}

Output

isr_stm.ready(): true