The read(char[]) method of Reader Class in Java is used to read the specified characters into an array. This method blocks the stream till:
- It has taken some input from the stream.
- Some IOException has occurred
- It has reached the end of the stream while reading.
Syntax:
public int read(char[] charArray)
Parameters: This method accepts a mandatory parameter charArray which is the character array to be written in the Stream.
Return Value: This method returns an integer value which is the number of characters read from the stream. It returns -1 if no character has been read.
Exception: This method throws IOException if some error occurs while input-output. Below methods illustrates the working of read(char[]) method:
Program 1:
Java
// Java program to demonstrate// Reader read(char[]) methodimport java.io.*;import java.util.*;class GFG { public static void main(String[] args) { try { String str = " GeeksForGeeks& quot; ; // Create a Reader instance Reader reader = new StringReader(str); // Get the character array // to be read from the stream char[] charArray = new char[5]; // Read the charArray // to this reader using read() method // This will put the str in the stream // till it is read by the reader reader.read(charArray); // Print the read charArray System.out.println(Arrays.toString(charArray)); reader.close(); } catch (Exception e) { System.out.println(e); } }} |
Output:
[G, e, e, k, s]
Program 2:
Java
// Java program to demonstrate// Reader read(char[]) methodimport java.io.*;import java.util.*;class GFG { public static void main(String[] args) { try { String str = "GeeksForGeeks"; // Create a Reader instance Reader reader = new StringReader(str); // Get the character array // to be read from the stream char[] charArray = new char[str.length()]; // Read the charArray // to this reader using read() method // This will put the str in the stream // till it is read by the reader reader.read(charArray); // Print the read charArray System.out.println( Arrays .toString(charArray)); reader.close(); } catch (Exception e) { System.out.println(e); } }} |
Output:
[G, e, e, k, s, F, o, r, G, e, e, k, s]
Program 3:
Java
// Use a BufferedReader to read characters from the console.import java.io.*;public class GFG { public static void main(String args[]) throws IOException { char c; BufferedReader br = new BufferedReader( new InputStreamReader(System.in)); System.out.println( "Enter the characters: , 'q' to quit."); // read characters do { c = (char)br.read(); System.out.println(c); } while (c != 'q'); }} |
Output:
gfgisbest g f g i s b e s t q
