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Pangram.java

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package strings;

/** Wikipedia: https://en.wikipedia.org/wiki/Pangram */

public class Pangram {

/** Driver Code */

public static void main(String[] args) {

assert isPangram("The quick brown fox jumps over the lazy dog");

assert !isPangram("The quick brown fox jumps over the azy dog"); /* not exists l character */

}

/**

* Check if a string is a pangram string or not

*

* @param s string to check

* @return {@code true} if given string is pangram, otherwise {@code false}

*/

public static boolean isPangram(String s) {

boolean[] marked = new boolean[26]; /* by default all letters don't exists */

char[] values = s.toCharArray();

for (char value : values) {

if (Character.isLetter(value)) {

int index = Character.isUpperCase(value) ? value - 'A' : value - 'a';

marked[index] = true; /* mark current character exists */

}

}

for (boolean b : marked) {

if (!b) {

return false;

}

}

return true;

}

}