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package com.sun.enterprise.util;
/**
An easy interface to read numbers and strings from
standard input
@version $Revision: 1.4 $
@author bnevins
*/
public class Console
{
/** print a prompt on the console but don't print a newline
@param prompt the prompt string to display
*/
public static void printPrompt(String prompt)
{
System.out.print(prompt + " ");
System.out.flush();
}
/** read a string from the console. The string is
terminated by a newline
@return the input string (without the newline)
*/
public static String readLine()
{
int ch;
String r = "";
boolean done = false;
while (!done)
{
try
{
ch = System.in.read();
if (ch < 0 || (char)ch == '\n')
done = true;
else if ((char)ch != '\r') // weird--it used to do \r\n translation
r = r + (char) ch;
}
catch(java.io.IOException e)
{
done = true;
}
}
return r;
}
/** read a string from the console. The string is
terminated by a newline
@param prompt the prompt string to display
@return the input string (without the newline)
*/
public static char getKey(String prompt)
{
printPrompt(prompt);
int ch = '\n';
try
{
ch = System.in.read();
}
catch(java.io.IOException e)
{
}
return (char)ch;
}
/** read a string from the console. The string is
terminated by a newline
@param prompt the prompt string to display
@return the input string (without the newline)
*/
public static String readLine(String prompt)
{
printPrompt(prompt);
return readLine();
}
/** read an integer from the console. The input is
terminated by a newline
@param prompt the prompt string to display
@return the input value as an int
@exception NumberFormatException if bad input
*/
public static int readInt(String prompt)
{
while(true)
{
printPrompt(prompt);
try
{
return Integer.valueOf
(readLine().trim()).intValue();
}
catch(NumberFormatException e)
{
System.out.println("Not an integer. Please try again!");
}
}
}
/** read a floating point number from the console.
The input is terminated by a newline
@param prompt the prompt string to display
@return the input value as a double
@exception NumberFormatException if bad input
*/
public static double readDouble(String prompt)
{
while(true)
{
printPrompt(prompt);
try
{
return Double.parseDouble(readLine().trim());
}
catch(NumberFormatException e)
{
System.out.println("Not a floating point number. Please try again!");
}
}
}
}
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