Apex Get Random Value

CommonUtil.cls

public with sharing class CommonUtil {
    
    /**
     * ランダム値取得
     */
    public static Integer getRandomNumber(Integer upperLimit) {

        if (upperLimit == null || upperLimit <= 0) {
            return 0;
        }

        Integer rand = Math.round(Math.random()*1000);
        return Math.mod(rand, upperLimit);
    }
}