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- package com.company;
- import java.io.BufferedWriter;
- import java.io.FileReader;
- import java.io.FileWriter;
- import java.util.HashMap;
- import java.util.Random;
- public class Main {
- public static void main(String[] args) throws Exception{
- // write your code here
- Random rand = new Random();
- FileWriter fw = new FileWriter("number.txt");
- BufferedWriter bw = new BufferedWriter(fw);
- HashMap<Integer, Boolean> unique = new HashMap();
- for (int i=0; i<500;) {
- int number = rand.nextInt(2212)+999;
- if(unique.containsKey(number))
- continue;
- else {
- bw.write(i+". "+"1803"+""+number+"\n");
- unique.put(number,true);
- // System.out.println(number);
- i++;
- }
- }
- bw.close();
- fw.close();
- }
- }
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