Generate a positive random long integer - Android java.util

Android examples for java.util:Random Integer

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Description

Generate a positive random long integer

Demo Code


import java.util.Random;

public class Main{
    /** one copy of this class! */
    private static RandUtils m_rand = null;
    /** random number generator */
    private Random m_rng;
    /**/*  w  w w  .  jav a 2s.  c  om*/
     * Generate a positive random long integer
     * @return positive long integer
     */
    public static long getPositiveLong() {
        long i = getObj().m_rng.nextLong();
        if (i < 0) {
            i = -i;
        }
        return i;
    }
    /**
     * Generate a positive random long integer
     * @param limit numbers should be between 0 to limit-1
     * @return positive long integer
     */
    public static long getPositiveLong(long limit) {
        long i = getObj().m_rng.nextLong();
        if (i < 0) {
            i = -i;
        }
        i %= limit;
        return i;
    }
    /**
     * Generate a positive random long integer
     * @param limit numbers should be between 0 to limit-1
     * @param first the first number in the range first to first + limit - 1
     * @return positive long integer
     */
    public static long getPositiveLong(long limit, long first) {
        long i = getObj().m_rng.nextLong();
        if (i < 0) {
            i = -i;
        }
        i %= limit;
        i += first;
        return i;
    }
    /**
     * Gets the object of this class
     * @return the desired object
     */
    public static RandUtils getObj() {
        if (m_rand != null) {
            return m_rand;
        }
        m_rand = new RandUtils();
        return m_rand;
    }
}

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