Java boolean type check social security number format

Question

We would like to write a program that prompts the user to enter a Social Security number in the format DDD-DD-DDDD, where D is a digit.

Your program should check whether the input is valid.

Here are sample runs: 

Enter a SSN: 232-23-1234 
232-23-1234 is a valid social security number 

Enter a SSN: 23-23-1234 
23-23-1234 is an invalid social security number 

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner input = new Scanner(System.in);

    // Prompt the user to enter a Social Security number
    System.out.print("Enter a SSN: ");
    String ssn = input.nextLine();

    // Check whether the input is valid
    boolean isValid = //your code here

    // Display result
    System.out.println(ssn + " is " + ((isValid) ? "a valid " : "an invalid ")
      + "social security number");
  }/*from   w  ww  .j  a v a  2s . co m*/
}




import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner input = new Scanner(System.in);

    // Prompt the user to enter a Social Security number
    System.out.print("Enter a SSN: ");
    String ssn = input.nextLine();

    // Check whether the input is valid
    boolean isValid = 
      (ssn.length() == 11) && 
      (Character.isDigit(ssn.charAt(0))) &&
      (Character.isDigit(ssn.charAt(1))) &&
      (Character.isDigit(ssn.charAt(2))) &&
      (ssn.charAt(3) == '-') &&
      (Character.isDigit(ssn.charAt(4))) &&
      (Character.isDigit(ssn.charAt(5))) &&
      (Character.isDigit(ssn.charAt(7))) &&
      (ssn.charAt(6) == '-') &&
      (Character.isDigit(ssn.charAt(8))) &&
      (Character.isDigit(ssn.charAt(9))) &&
      (Character.isDigit(ssn.charAt(10)));

    // Display result
    System.out.println(ssn + " is " + ((isValid) ? "a valid " : "an invalid ")
      + "social security number");
  }
}



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