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apl-mhd

randomNumberGenerator

Jan 22nd, 2018
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Java 0.91 KB | None | 0 0
  1. package com.company;
  2.  
  3. import java.io.BufferedWriter;
  4. import java.io.FileReader;
  5. import java.io.FileWriter;
  6. import java.util.HashMap;
  7. import java.util.Random;
  8.  
  9. public class Main {
  10.  
  11.     public static void main(String[] args)  throws Exception{
  12.     // write your code here
  13.  
  14.         Random rand = new Random();
  15.  
  16.  
  17.         FileWriter fw = new FileWriter("number.txt");
  18.         BufferedWriter bw = new BufferedWriter(fw);
  19.  
  20.         HashMap<Integer, Boolean> unique = new HashMap();
  21.  
  22.  
  23.         for (int i=0; i<500;) {
  24.  
  25.  
  26.             int number = rand.nextInt(2212)+999;
  27.  
  28.             if(unique.containsKey(number))
  29.                 continue;
  30.             else {
  31.  
  32.                 bw.write(i+". "+"1803"+""+number+"\n");
  33.                 unique.put(number,true);
  34.                // System.out.println(number);
  35.  
  36.                 i++;
  37.             }
  38.         }
  39.  
  40.         bw.close();
  41.         fw.close();
  42.     }
  43. }
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