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 program to demonstrate // Reader read(char[]) method import 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);
}
}
} |
[G, e, e, k, s]
Program 2:
// Java program to demonstrate // Reader read(char[]) method import 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);
}
}
} |
[G, e, e, k, s, F, o, r, G, e, e, k, s]
Program 3:
// 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