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.Â
Exception: This method throws IOException if some error occurs while input-output. Below methods illustrates the working of read(char[]) method:Â
Program 1:Â
Java
// Java program to demonstrate// Reader read(char[]) methodÂ
import java.io.*;import java.util.*;Â
class GFG {Â Â Â Â public static void main(String[] args)Â Â Â Â {Â
        try {Â
            String str = "            GeeksForGeeks& quot;            ;Â
            // Create a Reader instance            Reader reader = new StringReader(str);Â
            // Get the character array            // to be read from the stream            char[] charArray = new char[5];Â
            // 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);Â
            // Print the read charArray            System.out.println(Arrays.toString(charArray));Â
            reader.close();        }        catch (Exception e) {            System.out.println(e);        }    }} |
Output:
[G, e, e, k, s]
Program 2:Â
Java
// Java program to demonstrate// Reader read(char[]) methodÂ
import java.io.*;import java.util.*;Â
class GFG {Â Â Â Â public static void main(String[] args)Â Â Â Â {Â
        try {Â
            String str = "GeeksForGeeks";Â
            // Create a Reader instance            Reader reader                = new StringReader(str);Â
            // Get the character array            // to be read from the stream            char[] charArray                = new char[str.length()];Â
            // 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);Â
            // Print the read charArray            System.out.println(                Arrays                    .toString(charArray));Â
            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.*;Â
public class GFG {Â
    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.");Â
        // 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
