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sella gompel
readline Error
2 Answer(s)      4 years and 4 months ago
Posted in : Java Beginners


Hi sir, please helpme with my code.

Mycode does not work. The readLine () method seems to loose the first character of the string input from command line after the the first call to it. When Ienter the text abcd, the firt time it prints it correctly, every other time the first character is missing. Why is this.

class TestAdvt
{
public static void main (String[] args)
{
boolean done=false;
while (!done)
{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String str = null;

try
{
System.out.println ("Please enter the advertisement message to be displayed (enter 'n' to exit)");

str = br.readLine(); // Read input from command

if (!str.equalsIgnoreCase("n"))
{
System.out.println ("str1 = " + str);
Thread advt = new Thread(new Advertisement(str));

advt.start();
System.in.read(); // wait for input <ENTER>
advt.interrupt();

}
else
{
System.out.println ("str2 = " + str);
done = true;
br.close();
}
}
catch (IOException e)
{
System.out.println("IOException caught: " + e.getMessage());
}


}

} // end of main()
}
// --------End: TestAdvt.java ------------


class Advertisement extends Thread
{
private String message;

Advertisement (String message) { this.message=message;}

public void run()
{
while (!message.equals(""))
{
try
{
System.out.print(message+".. ");
Thread.sleep(1000);

}
catch (InterruptedException e)
{
this.message="";
break;
}
}
} // end of 'run()' ..


}

// --------End: Advertisement.java ------------

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View Answers

April 27, 2010 at 3:10 PM


Hi Friend,

Your code works fine here.

Thanks


April 27, 2010 at 4:19 PM


The error is hard to pust. but if you execute the code,
1. enter a string the first input request (eg hello world),
2. ENTER
3. ENTER n
The code will not terminated after the 'n'. This is because the first char is missing and from the readLine(). You would have to to enter 'nn'
for the code to exit. I think the problem is caused by the read() statement, just don't know why.

If on step 3 you type bye world, you would see the text (ye world), again the first char is missing.

Could you please check again. I have to use the System.in.read() for this home work.

thanks sella


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