Explanation how to convert an int to hex string in Java use bitwise operations

intToHexString.java

public static String toHexString(int decimal) {
    String codes = "0123456789ABCDEF";

    StringBuilder builder = new StringBuilder(8);

    builder.setLength(8);

    for (int i = 7; i >= 0; i--) {
        // E.g: let decimal = 229 -> its value when expressed in binary is 11100101
        // And binary form of 0xF is 1111 (equals to ..00000001111)
        // so AND operator between decimal 0xF basically takes 4 last bits of decimal because 11100101 & 00001111 = 00000101 = 5 in heximal
        builder.setCharAt(i, codes.charAt(decimal & 0xF));
        // decimal >> 4 basically removes 4 most right bits that already has been computed in previous line.
        // so after first loop, decimal = ..000001110, and 00001110 & 00001111 = 1110 = E in heximal
        // ========> result = 0xE5
        decimal = decimal >> 4;
    }

    return builder.toString();
}