Java ThreadLocalRandom getRandomNumbers(Integer startNumber, Integer endNumber, Integer pageSize, Integer numNumbers)

Description

get Random Numbers

License

Apache License

Declaration

public static List<Integer> getRandomNumbers(Integer startNumber, Integer endNumber, Integer pageSize,
            Integer numNumbers) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.util.ArrayList;

import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ThreadLocalRandom;

public class Main {
    public static List<Integer> getRandomNumbers(Integer startNumber, Integer endNumber, Integer pageSize,
            Integer numNumbers) {
        Set<Integer> integers = new HashSet<>();
        int maxNumbers = (endNumber - startNumber) / pageSize;
        if (numNumbers > maxNumbers) {
            numNumbers = maxNumbers;//from   ww  w  . jav  a  2  s  .co  m
        }

        while (integers.size() < numNumbers) {
            int i = ThreadLocalRandom.current().nextInt(startNumber, endNumber + 1);
            i = (i / pageSize) * pageSize;
            integers.add(i);
        }

        return new ArrayList<>(integers);
    }
}

Related

1. getRandomInt(int limit)
2. getRandomInt(int n)
3. getRandomInt(int r)
4. getRandomInteger()
5. getRandomIntegerElement(List list)
6. getRandomPassword()
7. getRandomStr(int len)
8. getRandomString(int length)
9. getRandomTarget(List targets)