Java: Return true if a given string contain the string 'pop', but the middle 'o' also may other character

Last update on May 21 2025 12:49:00 (UTC/GMT +8 hours)

72. Contains P?P Pattern

Write a Java program to return true if a given string contains the string 'pop', but the middle 'o' also may contain another character.

Visual Presentation:

Sample Solution:

Java Code:

import java.util.*;

// Define a class named Main
public class Main {

    // Method to check if "p?p" pattern appears in the given string
    public boolean popInTheString(String stng) {
        int len = stng.length(); // Get the length of the input string

        // Iterate through the string up to the third-to-last character
        for (int i = 0; i < len - 2; i++) {
            // Check if the current character is 'p' and the character two positions ahead is also 'p'
            if (stng.charAt(i) == 'p' && stng.charAt(i + 2) == 'p') {
                return true; // Return true if "p?p" pattern is found
            }
        }
        return false; // Return false if the pattern is not found in the string
    }

    // Main method to execute the program
    public static void main(String[] args) {
        Main m = new Main(); // Create an instance of the Main class

        String str1 = "dikchapop"; // Input string to be checked

        // Display the given string and check if "p?p" pattern appears in the string using popInTheString method
        System.out.println("The given string is: " + str1);
        System.out.println("Does 'p?p' appear in the given string? " + m.popInTheString(str1));
    }
}

Sample Output:

The given string is: dikchapop
Is p?p appear in the given string? true

The given string is: dikp$pdik
Is p?p appear in the given string? true

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to detect occurrences of the pattern "p?p" where '?' can be any character.
• Write a Java program to check for a pattern that starts with 'p', has any character, and ends with 'p'.
• Write a Java program to verify if a string contains a flexible "pop" pattern allowing a wildcard in the middle.
• Write a Java program to identify and return true if a string contains a substring matching "p?p" using regex.

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