CharArrayReader ready() method in Java with Examples

Last Updated : 13 Feb, 2019

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

// 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

// 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--

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CharArrayReader ready() method in Java with Examples

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