import java.util.Scanner;

public class ConsoleProgram{

private Scanner scanner;

public static void main(String[] args){

// Assume the class name is passed in as the first argument.

if(args.length == 0){

System.out.println("Please provide the name of the main class as an argument.");

return;

}

String mainClassName = args[0];

try{

Class mainClass = Class.forName(mainClassName);

Object obj = mainClass.newInstance();

ConsoleProgram program = (ConsoleProgram)obj;

program.run();

} catch (IllegalAccessException ex) {

System.out.println("Error in program. Make sure you extend ConsoleProgram");

} catch (InstantiationException ex) {

System.out.println("Error in program. Make sure you extend ConsoleProgram");

} catch (ClassNotFoundException ex) {

System.out.println("Error in program. Make sure you extend ConsoleProgram");

}

}

public void run(){

/* Overridden by subclass */

}

public ConsoleProgram(){

scanner = new Scanner(System.in);

}

public String readLine(String prompt){

System.out.print(prompt);

return scanner.nextLine();

}

public boolean readBoolean(String prompt){

while(true){

String input = readLine(prompt);

if(input.equalsIgnoreCase("true")){

return true;

}

if(input.equalsIgnoreCase("false")){

return false;

}

}

}

public double readDouble(String prompt){

while(true){

String input = readLine(prompt);

try {

double n = Double.valueOf(input).doubleValue();

return n;

} catch (NumberFormatException e){

}

}

}

// Allow the user to get an integer.

public int readInt(String prompt){

while(true){

String input = readLine(prompt);

try {

int n = Integer.parseInt(input);

return n;

} catch (NumberFormatException e){

}

}

}

}