Java - หลักการทำงานของโปรแกรมนี้ ทำงานอย่างไรครับ แปลงเป็นเลขฐาน16

import java.util.Scanner;
public class Decimal2HexConversion{
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a decimal number:");
        int decimal = sc.nextInt();
        
        System.out.println("The hex number for decimal "+decimal + " is " + decimalToHex(decimal));
}
public static String decimalToHex(int decimal){
    String hex = "";
    while(decimal!=0){
        int hexValue = decimal % 16;
        hex = toHexChar(hexValue)+hex;
        decimal = decimal/16;
    }
    return hex;
}
public static char toHexChar(int hexValue){
    if((hexValue <=9)&&(hexValue>=0))
        return (char)(hexValue+'0');
    else
        return (char)(hexValue -10+'A');
}
}