Java Random Long getRandomLong()

Description

Generates next random long

License

Apache License

Return

the generated long

Declaration

public static long getRandomLong() 

Method Source Code

//package com.java2s;
/*//from w  ww. jav a 2s.  c om
 * Copyright 2004 Senunkan Shinryuu
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.*;

public class Main {
    /**
     * Generates next random long
     * @return the generated long
     */
    public static long getRandomLong() {
        Random rand = new Random(System.currentTimeMillis());
        return rand.nextLong();
    }

    /**
     * Generates next random long
     * @return the generated long
     */
    public static long getRandomLong(long start, long end) {
        long l = 0;
        if (end > start) {
            long diff = end - start;
            int rand = getRandomInt((int) diff);
            l = start + rand;
        } else {
            l = getRandomLong();
        }
        return l;
    }

    /**
     * Generates next random Int
     * @param int max int
     * @return the generated int
     */
    public static int getRandomInt(int max) {
        Random rand = new Random(System.nanoTime()); // for jdk 6 only
        //Random rand = new Random(System.currentTimeMillis());
        if (max > 0) {
            return rand.nextInt(max);
        }
        return rand.nextInt();
    }

    /**
     * Generates next random Int
    lo    * @return the generated int
     */
    public static int getRandomInt() {
        return getRandomInt(-1);
    }
}

Related

1. getLong()
2. getLongBetween(long n, long m)
3. getLongInRange(long minValue, long maxValue)
4. getLongSpecial()
5. getLongSpecialCases()
6. nextLong()
7. nextLong()
8. nextLong()
9. nextLong(long n)