Starrier/commons

package org.starrier.common.utils;
 
import java.util.Random;
 
/**
 * @author Starrier
 * @date 2018/12/9.
 */
public class RandomUtils {
 
    private static final int[] ARRAY_NUMBER = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
 
    /**
     * Get two random number
     *
     * @param length number length
     */
    public static String randomNum(int length) {
        StringBuilder builder = new StringBuilder();
        Random random = new Random();
 
        for (int i = 0; i < length; i++) {
            builder.append(ARRAY_NUMBER[random.nextInt(10)]);
        }
        return builder.toString();
    }
 
    public static int nextInt(int num) {
        return new Random().nextInt(num);
    }
 
    public static int nextInt(int start, int end) {
        return start + new Random().nextInt(end - start);
    }
 
 
}