javaforeachhashmaphashcodeto-char

Creating Hash in Java

I came across this code which is using .toCharArray() to create a hashcode of a string which will be later used to store data in a HashMap.

    public static int generateHashCode(String s) {
    int code = 0;
    
    for(char next_character: s.toCharArray()) {
        code += next_character;
    }
    
    return code;
}

What I understand from this code is that it's using an enhanced for loop to traverse through each character of the string(Made array). What I don't understand is that how it's adding those "characters" to an "integer"-code. I changed the code to just print next_character and it printed all the individual characters of the strings.

Solution

  • What’s happening here is that the char is being promoted to an int, its value will be equal to the ASCII value.

    https://en.m.wikipedia.org/wiki/ASCII