StringReader read() method in Java with Examples
Last Updated :
13 Feb, 2019
The read() method of StringReader Class in Java is used to read a single character from the stream. 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.
This method is declared as abstract method. It means that the subclasses of StringReader abstract class should override this method if desired operation needs to be changed while reading a character.
Syntax:
public abstract int read()
Parameters: This method does not accepts any parameters
Return Value: This method returns an integer value which is the integer value read from the stream. It can range from 0 to 65535. Else 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() method:
Program 1:
import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args)
{
try {
String str = "GeeksForGeeks" ;
StringReader reader
= new StringReader(str);
int ch;
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);
}
}
}
|
Output:
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
Program 2:
import java.io.*;
import java.util.*;
class GFG {
public static void main(String[] args)
{
try {
String str = "GeeksForGeeks" ;
StringReader reader
= new StringReader(str);
int ch;
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);
}
}
}
|
Output:
Integer value of character read: 71
Actual character read: G
Reference: https://docs.oracle.com/javase/9/docs/api/java/io/StringReader.html#read–
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