Find whether two strings are anagrams

StringAnagram

public boolean isAnagram(String str1, String str2)
    {
        //To get the no of occurrences of each character and store it in their ASCII location
        int[] strCountArr1=getASCIICountArr(str1);
        int[] strCountArr2=getASCIICountArr(str2);
        //To Test whether the two arrays have the same count of characters. Array size 256 since ASCII 256 unique values
        for(int i=0;i<256;i++)
        {
            if(strCountArr1[i]!=strCountArr2[i])
                return false;
        }
        return true;
    }
    
    public int[] getASCIICountArr(String str)
    {
        char c;
        //Array size 256 for ASCII
        int[] strCountArr=new int[256];
        for(int i=0;i<str.length();i++)
        {
            c=str.charAt(i); 
            c=Character.toUpperCase(c);// If both the cases are considered to be the same
            strCountArr[(int)c]++; //To increment the count in the character's ASCII location
        }
        return strCountArr;
    }