Write a java program named SSN.java that prompts the user to enter a Social Security Number in format of DDD-DDD-DDD, where D is a digit. The first digit cannot be zero. Make sure that second set of three digits is more than 100. Your program should check whether the input is valid. Here are sample runs: Enter a SSN: 123-268-097 123-268-097 is a valid social security number Enter a SSN: 023-289-097 023-289-097 is an invalid social security number Enter a SSN: 198-068-097 198-068-097 is an invalid social security number Enter a SSN: 198-1680-97 198-1688-97 is an invalid social security number
Answers
Java program named `SSN.java` that prompts the user to enter a Social Security Number and validates it according to the given requirements:
```java
import java.util.Scanner;
public class SSN {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a SSN: ");
String ssn = scanner.nextLine();
if (isValidSSN(ssn)) {
System.out.println(ssn + " is a valid social security number");
} else {
System.out.println(ssn + " is an invalid social security number");
}
}
public static boolean isValidSSN(String ssn) {
if (ssn.matches("\\d{3}-\\d{3}-\\d{3}")) {
String[] parts = ssn.split("-");
int firstSet = Integer.parseInt(parts[0]);
int secondSet = Integer.parseInt(parts[1]);
int thirdSet = Integer.parseInt(parts[2]);
return firstSet > 0 && secondSet > 100 && thirdSet >= 0;
}
return false;
}
}
```
Explanation:
1. The program prompts the user to enter a Social Security Number using the `Scanner` class.
2. The entered SSN is passed to the `isValidSSN` method, which checks if it matches the required format using regular expression `\\d{3}-\\d{3}-\\d{3}` (three digits, a hyphen, three digits, a hyphen, and three digits).
3. If the SSN matches the format, it is split into three parts using the hyphens as separators.
4. The three parts are converted to integers for further validation.
5. The method checks if the first set is greater than 0, the second set is greater than 100, and the third set is non-negative.
6. If all the conditions are met, the method returns `true`, indicating a valid SSN. Otherwise, it returns `false`.
7. Finally, the program prints whether the entered SSN is valid or invalid based on the result of `isValidSSN` method.
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