PushbackReader read(char, int, int) method in Java with Examples
Last Updated :
29 Apr, 2019
The read(char[], int, int) method of PushbackReader Class in Java is used to read the specified length characters into an array at a specified offset. 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,
int offset,
int length)
Parameters: This method accepts three mandatory parameters:
- charArray which is the character array to be written in the Stream.
- offset which is the offset index at which the characters are to be written in the array.
- length which is the number of characters to be written in the array.
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 following exceptions:
- IOException: if some error occurs while input output.
- IndexOutOfBoundsException: if the offset value is not within the range of character array
Below methods illustrates the working of read(char[], int, int) method:
Program 1:
import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args)
{
try {
String s = "GeeksForGeeks" ;
StringReader stringReader
= new StringReader(s);
PushbackReader pushbackReader
= new PushbackReader(stringReader);
char [] charArray = new char [ 5 ];
int offset = 0 ;
int length = 5 ;
pushbackReader
.read(charArray, offset, length);
System.out.println(
Arrays.toString(charArray));
pushbackReader.close();
System.out.println( "Stream Closed." );
}
catch (Exception e) {
System.out.println(e);
}
}
}
|
Output:
[G, e, e, k, s]
Stream Closed.
Program 2:
import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args)
{
try {
String s = "GFG" ;
StringReader stringReader
= new StringReader(s);
PushbackReader pushbackReader
= new PushbackReader(stringReader);
char [] charArray = new char [ 5 ];
int offset = 0 ;
int length = 2 ;
pushbackReader
.read(charArray, offset, length);
System.out.println(
Arrays.toString(charArray));
pushbackReader.close();
System.out.println( "Stream Closed." );
}
catch (Exception e) {
System.out.println(e);
}
}
}
|
Output:
[G, F,,, ]
Stream Closed.
Reference: https://docs.oracle.com/javase/9/docs/api/java/io/PushbackReader.html#read-char:A-int-int-
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