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// The Weekly Challenge 110
// Task 1 Valid Phone Numbers
import java.io.File;
import java.util.Scanner;
import java.io.FileNotFoundException;
// Usage: java PhoneNumber [file name]
public class PhoneNumber
{
public static void main(String[] args) throws Exception
{
try {
File file = new File(args[0]);
Scanner sc = new Scanner(file);
while (sc.hasNextLine()) {
String num = sc.nextLine();
if ( checkHead(num) && checkMid(num) &&
num.substring(5).trim().length() == 10 && checkTail(num))
System.out.println(num);
}
} catch (FileNotFoundException e) {
System.out.println(e.getMessage());
System.exit(0);
} catch (IndexOutOfBoundsException e) {
System.out.println("Usage: java PhoneNumber [file name]");
System.exit(0);
}
}
private static boolean checkHead(String tel)
{
tel = tel.trim();
if (tel.charAt(0) == '+'
&& isNumeric(tel.charAt(1))
&& isNumeric(tel.charAt(2)) )
return true;
if (tel.charAt(0) == '(' && tel.charAt(3) == ')'
&& isNumeric(tel.charAt(1))
&& isNumeric(tel.charAt(2)))
return true;
boolean temp_bl = true;
for (int a = 0; a < 4 && temp_bl ; a++)
temp_bl = temp_bl && isNumeric(tel.charAt(a));
return temp_bl;
}
private static boolean checkMid(String tel)
{
return tel.charAt(4) == ' ';
}
private static boolean checkTail(String tel)
{
boolean temp_bl = true;
for (int i = 0; i < 10 && temp_bl ; i++)
temp_bl = temp_bl && isNumeric(tel.charAt(5+i));
return temp_bl;
}
private static boolean isNumeric(char ch)
{
if (ch >= '0' && ch <= '9') return true;
else return false;
}
}
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