Pangram Checking in Java

By Kollabathula Preetham

In this tutorial, we will be checking if a string is a Pangram or not in Java.
So what are Pangram Strings?

Pangram

A String which contains all the 26 letters of English alphabets is called as a Pangram String.
These letters can be lowercase or uppercase.

Example 1: ” qwaserdftyghujkiolpbnmvcxz “.
The above sentence contains all the 26 letters in English.
Hence this sentence is a Pangram.

Example 2: ” guoghwec  dhsjk hkjkshdgwo mcaxmnhihd “.
The above sentence doesn’t contain all the 26 English letters.
Hence this sentence is not a Pangram.

The .java file for checking if a string is a Pangram or not in Java is given below.

Code for implementing Pangram Checking in Java

import java.util.*;
class pangram
{
  public static void main(String[]args)
  {
    Scanner scan = new Scanner(System.in);

    System.out.print("Enter the String: ");
    String s = scan.nextLine();

    int[]check = new int[26];
    String str = s.toLowerCase(); //to convert the entire string to lowercase

    for(int i = 0; i < str.length(); i++)
    {
      if(str.charAt(i) != 36 && str.charAt(i) >= 97 && str.charAt(i) <= 122)
      {
        check[str.charAt(i) - 97] = 1; 
      }
    }

    for(int i = 0; i < 26; i++)
    {
      if(check[i] != 1)
      {
        System.out.println("Not Pangram");
        System.exit(0);
      }
    }

    System.out.println("Pangram");
  }
}

Explanation

  1. Firstly we scan the input String and convert it into lowercase to simplify the problem.
  2. Next, we check each character of the string and using its ASCII value we store a value (in this case 1) in its respective array location so that we can fill the entire array with 1’s.
  3. In the end, after filling the array, we check if all the places in the array have been filled with 1’s or not.

 

Output:

Enter the String: Codespeedy.com
Not pangram
Enter the String: The quick brown fox jumps over the lazy dog
Pangram

 

Hope you’ve understood the code 🙂
Any questions please feel free to drop in your comments.

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