Java Random Int getRandomInteger(int aStart, int aEnd)

Description

get Random Integer

License

Apache License

Declaration

public static int getRandomInteger(int aStart, int aEnd) 

Method Source Code

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

import java.util.Random;

public class Main {
    public static int getRandomInteger(int aStart, int aEnd) {
        if (aStart > aEnd) {
            throw new IllegalArgumentException("Start cannot exceed End.");
        }//  w  w w.j a  v a  2 s .  c  o  m
        Random aRandom = new Random();
        //get the range, casting to long to avoid overflow problems
        long range = (long) aEnd - (long) aStart + 1;
        // compute a fraction of the range, 0 <= frac < range
        long fraction = (long) (range * aRandom.nextDouble());
        int randomNumber = (int) (fraction + aStart);
        System.out.printf("Generated : " + randomNumber);
        return randomNumber;
    }
}

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