Compare Strings

 1 public class Solution {
 2     /**
 3      * @param A : A string includes Upper Case letters
 4      * @param B : A string includes Upper Case letter
 5      * @return :  if string A contains all of the characters in B return true else return false
 6      */
 7     public boolean compareStrings(String A, String B) {
 8         if (A == null & B != null) return false;
 9         if (A == null && B == null) return true;
10         if (B == null) return true;
11         
12         int[] charCounts = new int[256];
13         
14         for (int i = 0; i < A.length(); i++) {
15             charCounts[A.charAt(i)]++;
16         }
17         
18         for (int i = 0; i < B.length(); i++) {
19             if (charCounts[B.charAt(i)] == 0) {
20                 return false;
21             }
22             charCounts[B.charAt(i)]--;
23         }
24         return true;
25     }
26 }