package com.jjinfo.common.util;
import java.util.Arrays;
import java.util.Random;
public class RandomNumberGenerator {
public static String generateNumber() {
String no="";
//Initializes the alternate array
int[] defaultNums = new int[10];
for (int i = 0; i < defaultNums.length; i++) {
defaultNums[i] = i;
}
Random random = new Random();
int[] nums = new int[LENGTH];
//The partial length that can be selected from the default array
int canBeUsed = 10;
//Populate the target array
for (int i = 0; i < nums.length; i++) {
//Stores randomly selected Numbers in the target array
int index = random.nextInt(canBeUsed);
nums[i] = defaultNums[index];
//Drop the used Numbers at the end of the alternate array and reduce the optional area
swap(index, canBeUsed - 1, defaultNums);
canBeUsed--;
}
if (nums.length>0) {
for (int i = 0; i < nums.length; i++) {
no+=nums[i];
}
}
return no;
}
private static final int LENGTH = 8;
private static void swap(int i, int j, int[] nums) {
int temp = nums[i];
nums[i] = nums[j];
nums[j] = temp;
}
public static String generateNumber2() {
String no="";
int num[]=new int[8];
int c=0;
for (int i = 0; i < 8; i++) {
num[i] = new Random().nextInt(10);
c = num[i];
for (int j = 0; j < i; j++) {
if (num[j] == c) {
i--;
break;
}
}
}
if (num.length>0) {
for (int i = 0; i < num.length; i++) {
no+=num[i];
}
}
return no;
}
public static void main(String[] args) {
for (int i = 0; i < 10; i++) {
// System.out.println(generateNumber());
System.out.println(generateNumber2());
}
}
}