get Random N String - Java java.util

Java examples for java.util:Random String

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Description

get Random N String

Demo Code

/*/*from  ww  w.  ja va 2s . c o m*/
 * *********************************************************************
 * Copyright (c) 2010 Pedro Gomes and Universidade do Minho.
 * All rights reserved.
 * 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.
 *
 * ********************************************************************
 */
//package com.java2s;

import java.util.*;

public class Main {
    public static void main(String[] argv) throws Exception {
        int num_digits = 2;
        System.out.println(getRandomNString(num_digits));
    }

    private static Random rand = new Random();

    public static int getRandomNString(int num_digits) {
        int return_num = 0;
        for (int i = 0; i < num_digits; i++) {
            return_num += getRandomInt(0, 9)
                    * (int) java.lang.Math.pow(10.0, (double) i);
        }
        return return_num;
    }

    public static int getRandomInt(int lower, int upper) {

        int num = (int) Math.floor(rand.nextDouble()
                * ((upper + 1) - lower));
        if (num + lower > upper || num + lower < lower) {
            System.out.println("ERROR: Random returned value of of range!");
            System.exit(1);
        }
        return num + lower;
    }
}

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