Java: Check first string contains letters from the second

Last update on December 21 2024 10:02:26 (UTC/GMT +8 hours)

A string is created by using another string's letters. Letters are case sensitive. Write a Java program that checks the letters of the second string are present in the first string. Return true otherwise false.

Visual Presentation:

Sample Data:

("Python", "python") -> false
("Java", "Ja") -> true
("Check first string", "sifC") ->true

Sample Solution-1:

Java Code:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner myObj = new Scanner(System.in); // Create a Scanner object for user input
        
        // Prompt the user to input the first and second strings
        System.out.println("Input the first string: ");
        String text = myObj.nextLine(); // Read the first string
        System.out.println("Input the second string: ");
        String word = myObj.nextLine(); // Read the second string
        
        // Check if the first string contains all letters from the second string
        System.out.println("Check first string contains letters from the second string:\n" + test(text, word));
    }

    // Method to check if the first string contains all letters from the second string
    public static boolean test(String first_string, String second_string) {
        if (second_string.length() > first_string.length()) return false; // If the second string is longer, return false
        if (second_string.isEmpty()) return true; // If the second string is empty, return true
        
        // Iterate through each character in the second string
        for (int i = 0; i < second_string.length(); i++) {
            // If the first string does not contain the current character from the second string, return false
            if (!first_string.contains(String.valueOf(second_string.charAt(i)))) {
                return false;
            }
        }
        return true; // Return true if all characters from the second string are found in the first string
    }
}

Sample Output:

Input the first string: 
 Java
Input the second string: 
 Ja
Check first string contains letters from the second string:
true

Flowchart:

Sample Solution-2:

Java Code:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner myObj = new Scanner(System.in); // Create a Scanner object for user input
        
        // Prompt the user to input the first and second strings
        System.out.println("Input the first string: ");
        String text = myObj.nextLine(); // Read the first string
        System.out.println("Input the second string: ");
        String word = myObj.nextLine(); // Read the second string
        
        // Check if the first string contains all letters from the second string
        System.out.println("Check first string contains letters from the second string:\n" + test(text, word));
    }

    // Method to check if the first string contains all letters from the second string
    public static boolean test(String first_string, String second_string) {
        for (int n = 0; n < second_string.length(); n++) // Loop through each character of the second string
            if (first_string.replaceFirst(second_string.substring(n, n + 1), "").equals(first_string)) // If the character from the second string is not found in the first string
                return false; // Return false
            else
                first_string = first_string.replaceFirst(second_string.substring(n, n + 1), ""); // Remove the character from the first string
        return true; // Return true if all characters from the second string are found in the first string
    }
}

Sample Output:

Input the first string: 
 Java
Input the second string: 
 Ja
Check first string contains letters from the second string:
true

Flowchart:

Java Code Editor:

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