Using read() to read one character at a time from console input

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To read a character from a BufferedReader, use read( ). One form of the read() is:

int read( ) throws IOException

Each time that read( ) is called, it reads a character from the input stream and returns it as an integer value. It returns –1 when the end of the stream is encountered. As you can see, it can throw an IOException.

The following program demonstrates read( ) by reading characters from the console until the user types a "q":

// Use a BufferedReader to read characters from the console.
import java.io.*;
class BRRead {
public static void main(String args[])
throws IOException
{
char c;
BufferedReader br = new
BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter characters, 'q' to quit.");
// read characters
do {
c = (char) br.read();
System.out.println(c);
} while(c != 'q');
}
}

Here is a sample run:

Enter characters, 'q' to quit.
123abcq
1
2
3
a
b
c
q

This output may look a little different from what you expected, because System.in is line buffered, by default. This means that no input is actually passed to the program until you press ENTER. As you can guess, this does not make read( ) particularly valuable for interactive, console input.


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Comments(2)


1. View Comment

package alphabets;

import java.util.Scanner;

/**
*
* @author User
*/
class Alphabets
{
public static void main(String args[])
{
Scanner input = new Scanner(System.in);
char ch1,ch2;
ch1 = input.next().charAt(0);
ch2 = input.next().charAt(0);
System.out.println("Your Frist Character is: "+ch1);
System.out.println("Your Second Character is: "+ch2);
boolean flag = true;
if(ch1 == ch2)
{
System.out.println(flag);
}
else
{
flag = false;
System.out.println("Character did not match "+flag);
}
}
}


View Tutorial          By: Nitish at 2013-01-25 04:06:38
2. View Comment

I need
text,number,text,number,text,number input in android(JAVA)...
If i type second one in text Wont typed...
If i type first one in number Wont typed...
how to get this..


View Tutorial          By: kabil dev at 2015-05-29 13:10:40

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