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Update Pangram.java using Java Collections (#4479)

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* Update Pangram.java using Java Collections

A simple separate function isPangramOrNot(String s) has been created which implements the Pangram checking of a string using Java Collection Framework approach.

* Update Pangram.java using Java Collections

* Updated some linting errors in Pangram.java

* Update src/main/java/com/thealgorithms/strings/Pangram.java

Co-authored-by: Debasish Biswas <debasishbsws.dev@gmail.com>

* Updated Pangram.java

Method name updated to - isPangramUsingSet(String s)

* Updated the testcases PangramTest.java

Successfully updated the testcases in this same PR branch

---------

Co-authored-by: Debasish Biswas <debasishbsws.dev@gmail.com>
This commit is contained in:
ANKIT SAHA 2023-10-01 16:28:13 +05:30 committed by GitHub
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commit ee2629c8ab
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18
src/main/java/com/thealgorithms/strings/Pangram.java
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@ -1,5 +1,7 @@
package com.thealgorithms.strings;
import java.util.HashSet;
/**
* Wikipedia: https://en.wikipedia.org/wiki/Pangram
*/
@ -15,6 +17,22 @@ public class Pangram {
assert !isPangram("\u0000/\\");
}
/**
* Checks if a String is considered a Pangram
*
* @param s The String to check
* @return {@code true} if s is a Pangram, otherwise {@code false}
*/
// alternative approach using Java Collection Framework
public static boolean isPangramUsingSet(String s) {
HashSet<Character> alpha = new HashSet<Character>();
s = s.trim().toLowerCase();
for (int i = 0; i < s.length(); i++)
if (s.charAt(i) != ' ') alpha.add(s.charAt(i));
if (alpha.size() == 26) return true;
return false;
}
/**
* Checks if a String is considered a Pangram
*

5
src/test/java/com/thealgorithms/strings/PangramTest.java
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@ -17,5 +17,10 @@ public class PangramTest {
assertFalse(Pangram.isPangram2("The quick brown fox jumps over the azy dog")); // L is missing
assertFalse(Pangram.isPangram2("+-1234 This string is not alphabetical"));
assertFalse(Pangram.isPangram2("\u0000/\\ Invalid characters are alright too"));
assertTrue(Pangram.isPangramUsingSet("The quick brown fox jumps over the lazy dog"));
assertFalse(Pangram.isPangramUsingSet("The quick brown fox jumps over the azy dog")); // L is missing
assertFalse(Pangram.isPangramUsingSet("+-1234 This string is not alphabetical"));
assertFalse(Pangram.isPangramUsingSet("\u0000/\\ Invalid characters are alright too"));
}
}