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Java PushbackReader ready() Method with Example

PushbackReader Class ready() method: Here, we are going to learn about the ready() method of PushbackReader Class with its syntax and example.
Submitted by Preeti Jain, on April 20, 2020

PushbackReader Class ready() method

• ready() method is available in java.io package.
• ready() method is used to check whether this stream is ready to be read 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 boolean, it returns true when input data is exists for the next read without blocking otherwise it returns false.

Example:

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

import java.io.*;

public class ReadyOfPBR {
    public static void main(String[] args) throws Exception {
        Reader r_stm = null;
        PushbackReader pb_r = null;
        try {
            // Instantiates Reader and PushbackReader
            r_stm = new StringReader("Java World!!!!");
            pb_r = new PushbackReader(r_stm);

            // By using ready() method is to
            // check whether this stream is ready to
            // be read or not
            boolean status = pb_r.ready();
            System.out.println("pb_r.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 (r_stm != null) {
                r_stm.close();
                if (pb_r != null) {
                    pb_r.close();
                }
            }
        }
    }
}

Output

pb_r.ready(): true