RandomUtils.java

/*
 * Copyright 2008 Jeff Dwyer
 * 
 * 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.apress.progwt.server.util;

import java.util.Random;

public class RandomUtils {
    private static Random rn = new Random();

	public static int rand(int lo, int hi) {
            int n = hi - lo + 1;
            int i = rn.nextInt() % n;
            if (i < 0){
                    i = -i;
            }
            return lo + i;
    }

    public static String randomstring(int minLength, int maxLength){
            int n = rand(minLength, maxLength);
            byte[] b = new byte[n];
            for (int i = 0; i < n; i++){
                    b[i] = (byte)rand('A', 'Z');
            }
            return new String(b);
    }

    public static String randomstring(int length){
    	return randomstring(length, length);
    }   
    
    
    
}