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CharArrayReader ready() method in Java with Examples

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The ready() method of CharArrayReader Class in Java is used to check whether this CharArrayReader is ready to be read or not. It returns a boolean which states if the reader is ready.

Syntax:

public void ready()

Parameters: This method does not accepts any parameters

Return Value: This method returns a boolean value which tells if this CharArrayReader is ready to be read or not. It return true if it is ready. Else it returns false.

Exception: This method throws IOException if some error occurs while input-output.

Below methods illustrates the working of ready() method:

Program 1:




// Java program to demonstrate
// CharArrayReader ready() method
  
import java.io.*;
import java.util.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
  
            char[] str = { 'G', 'e', 'e', 'k', 's',
                           'F', 'o', 'r',
                           'G', 'e', 'e', 'k', 's' };
  
            // Create a CharArrayReader instance
            CharArrayReader reader
                = new CharArrayReader(str);
  
            // Check if the CharArrayReader is
            // ready to be read using ready()
            System.out.println("Is CharArrayReader ready "
                               + "to be read: "
                               + reader.ready());
  
            // Get the character
            // to be read from the stream
            int ch;
  
            // Read the first 5 characters
            // to this reader using read() method
            // This will put the str in the stream
            // till it is read by the reader
            for (int i = 0; i < 5; i++) {
                ch = reader.read();
                System.out.println("\nInteger value "
                                   + "of character read: "
                                   + ch);
                System.out.println("Actual "
                                   + "character read: "
                                   + (char)ch);
            }
  
            reader.close();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}


Output:

Is CharArrayReader ready to be read: true

Integer value of character read: 71
Actual character read: G

Integer value of character read: 101
Actual character read: e

Integer value of character read: 101
Actual character read: e

Integer value of character read: 107
Actual character read: k

Integer value of character read: 115
Actual character read: s

Program 2:




// Java program to demonstrate
// CharArrayReader ready() method
  
import java.io.*;
import java.util.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
            char[] str = { 'G', 'e', 'e', 'k', 's',
                           'F', 'o', 'r',
                           'G', 'e', 'e', 'k', 's' };
  
            // Create a CharArrayReader instance
            CharArrayReader reader
                = new CharArrayReader(str);
  
            reader.close();
  
            // Check if the CharArrayReader is
            // ready to be read using ready()
            System.out.println("Is CharArrayReader ready "
                               + "to be read: "
                               + reader.ready());
  
            // Get the character
            // to be read from the stream
            int ch;
  
            // Read the first character
            // to this reader using read() method
            // This will put the str in the stream
            // till it is read by the reader
            ch = reader.read();
            System.out.println("\nInteger value "
                               + "of character read: "
                               + ch);
            System.out.println("Actual "
                               + "character read: "
                               + (char)ch);
  
            reader.close();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}


Output:

java.io.IOException: Stream closed

Reference: https://docs.oracle.com/javase/9/docs/api/java/io/CharArrayReader.html#ready–



Last Updated : 13 Feb, 2019
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