El método ready() de CharArrayReader Class en Java se usa para verificar si este CharArrayReader está listo para ser leído o no. Devuelve un valor booleano que indica si el lector está listo.
Sintaxis:
public void ready()
Parámetros: este método no acepta ningún parámetro
Valor de retorno: este método devuelve un valor booleano que indica si este CharArrayReader está listo para ser leído o no. Devuelve verdadero si está listo. De lo contrario, devuelve falso.
Excepción: este método lanza IOException si ocurre algún error durante la entrada-salida.
Los siguientes métodos ilustran el funcionamiento del método ready():
Programa 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); } } }
Producción:
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
Programa 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); } } }
Producción:
java.io.IOException: Stream closed
Referencia: https://docs.oracle.com/javase/9/docs/api/java/io/CharArrayReader.html#ready–