Check if the Sentence Is Pangram

A pangram is a sentence where every letter of the English alphabet appears at least once.
Given a string sentence containing only lowercase English letters, return true if sentence is a pangram, or false otherwise.

Example 1:
Input: sentence = "thequickbrownfoxjumpsoverthelazydog"
Output: true
Explanation: sentence contains at least one of every letter of the English alphabet.

Example 2:
Input: sentence = "leetcode"
Output: false

class Solution {
    public boolean checkIfPangram(String sentence) {
        HashMap<Character,Integer>map=new HashMap<>();
        for(int i=0;i<sentence.length();i++){
            map.put(sentence.charAt(i),1);
        }
        if(map.size()==26){
            return true;
        }
        return false;
    }
}