Write a Java program to check whether a substring(abc) appears before a period(.) within a given string

Here is a simple Java program that checks if the substring "abc" appears before a period (.) in a given string:

import java.util.Scanner;

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

        // Input a string from the user
        System.out.print("Enter a string: ");
        String input = scanner.nextLine();

        // Call the method to check the condition
        boolean result = isSubstringBeforePeriod(input, "abc");

        // Output the result
        if (result) {
            System.out.println("The substring 'abc' appears before a period (.) in the given string.");
        } else {
            System.out.println("The substring 'abc' does not appear before a period (.) in the given string.");
        }

        scanner.close();
    }

    // Method to check if the substring appears before the period
    public static boolean isSubstringBeforePeriod(String str, String substr) {
        int periodIndex = str.indexOf('.');
        int substrIndex = str.indexOf(substr);

        // Check if the substring appears before the period
        return (substrIndex != -1) && (periodIndex != -1) && (substrIndex < periodIndex);
    }
}

Explanation of the Program

1. Input Handling: The program prompts the user to enter a string.
2. Method Logic: The method isSubstringBeforePeriod checks the positions of the substring "abc" and the first period in the string.
3. Condition Check: It verifies if the substring occurs before the period and returns a boolean value.
4. Output: The program then displays whether the substring appears before the period based on the returned value.

You can run this program in any Java environment to test it with various strings.