[salesforce apex] apex 中生成随机码

 * @param length The number of digits to return
 * @return a random number the length of the input param length
 * @description one limitation, will never start with 0
 */
public static String generateRandomNumber(Integer length) {
    String result = '';
    while(result.length() < length){
       //Math.abs used to cast Crypto.getRandomLong() to a positive number
       result += String.valueOf(Math.abs(Crypto.getRandomLong()));
    }
    return result.substring(0,length);
}

 * @param length The number of digits to return
 * @return a random number the length of the input param length
 * @description one limitation, will never start with 0
 */
public static String generateRandomNumber(Integer length) {
    String result = '';
    while(result.length() < length){
       //Math.abs used to cast Crypto.getRandomLong() to a positive number
       result += String.valueOf(Math.abs(Crypto.getRandomLong()));
    }
    return Integer.valueOf(result.substring(0,length));
}

//Generate a random Double between 0 and 1
System.debug(Math.Random());
//Prints e.g. 0.3128804447173097 

//Generate a random Double between 0 and 10
System.debug(Math.Random() * 10);
//Prints e.g. 5.235707559078412

//Generate a random Integer between 0 and 10
System.debug(Integer.valueOf(Math.Random() * 10));
//Prints e.g. 5

//Generate a random Integer between 0 and 100
System.debug(Integer.valueOf(Math.Random() * 100));

System.debug(Crypto.getRandomInteger());
//prints e.g. -1608518142