Java Random Number genRandomNumList(int num, int count)

Description

gen Random Num List

License

Open Source License

Declaration

public static List<Integer> genRandomNumList(int num, int count) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;

public class Main {

    public static List<Integer> genRandomNumList(int num, int count) {
        if (num < count) {
            return Collections.EMPTY_LIST;
        }/*  w  w w .  ja v  a 2s  . co m*/

        List<Integer> result = new ArrayList<Integer>();
        Map<Integer, String> containMap = new HashMap<Integer, String>();
        Integer temp = null;
        Random random = new Random();
        for (int i = 0; i < count;) {
            temp = random.nextInt(num);
            if (!containMap.containsKey(temp)) {
                containMap.put(temp, null);
                result.add(temp);
                i++;
            }
        }

        return result;
    }
}

Related

1. genRandomNumber()
2. genRandomNumber(int begin, int end)
3. genRandomNumber(int digitNumber)
4. genRandomNumber(int minNumber, int maxNumber, int digits)
5. genRandomNumberString(int numberCount)
6. getChance(Number number)
7. getDocumentNumber()
8. getFlightNumber()
9. getNextRandomNumber()