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From: Daniele Futtorovic <da.futt.news@laposte.net>
Newsgroups: comp.lang.java.programmer
Subject: Re: Finding Duplicate Values In An Array List
Date: Wed, 09 Jul 2014 16:47:56 +0200
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Xref: csiph.com comp.lang.java.programmer:29019

Here's another, shorter one:

public static void main(String[] ss){
  Scanner sc = new Scanner(System.in);
  Set<Integer> sieve = new HashSet<Integer>();
  List<Integer> stash = new ArrayList<Integer>(20);

  while( stash.size() < 20 ){
    System.err.printf( "Enter %d more number(s) between 10 and 100:%n",
20 - stash.size() );
    String raw = sc.next();

    try {
      int input = Integer.parseInt(raw);

      if( input < 10 || input > 100 ){
        System.err.println( "Out of range: " + input );
      }
      else if( ! sieve.add( input ) ){
        System.err.println( "Duplicate: " + input );
      }
      else {
        stash.add( input );
        System.err.println( stash );
      }
    }
    catch( NumberFormatException nfex  ){
      System.err.println( "Not a number: " + raw );
    }
  }

On 2014-07-09 11:31, gunitinug@gmail.com allegedly wrote:
> http://www.dreamincode.net/forums/topic/349987-finding-duplicate-values-in-an-array-list/
> 
> My solution:
> 
> CLASS Populate:
> 
> import java.util.*;
> 
> class Populate {
>     
>     // goal: populate twenty entries for array.
>     // 1. get an input from keyboard an integer value.
>     // 2. check its between 10 and 100.
>     // 3. check its a duplicate.
>     // 4. add to the array.
>     // 5. print content of array after each insertion.
>     
>     static Scanner kb=new Scanner(System.in);
>     
>     int[] array=new int[20];
>     int current_size;
>     int candidate;
>     
>     Populate() {
>         current_size=0;
>     }
>     
>     void generateCandidate() {
>         candidate=kb.nextInt();
>     }
>     
>     void killKB() {
>         kb.close();
>     }
>     
>     int getCandidate() {
>         return candidate;
>     }
>     
>     boolean checkBoundary(int chk) {
>         if (chk>=10 && chk<=100) return true;
>         else return false;
>     }
>     
>     // check an integer against all values of the array
>     boolean checkIsDuplicate(int chk) {
>         for (int i=0; i<current_size; i++) {
>             if (chk==array[i]) return true;
>         }
>         return false;
>     }
>     
>     void addEntry(int chk) {
>         array[current_size]=chk;
>         current_size++;
>     }
> 
>     void print() {
>         for (int i=0; i<current_size; i++) {
>             System.out.print(array[i]);
>             System.out.print(" ");
>         }
>         System.out.println();
>     }
> }
> 
> CLASS PopulateMain
> 
> class PopulateMain {
>     public static void main(String[] args) {
>         Populate pop=new Populate();
>         
>         // how to populate twenty entries?
>         int total=0;
>         while (total<20) {
>             pop.generateCandidate();
>             int c=pop.getCandidate();
>             if (pop.checkBoundary(c) && !pop.checkIsDuplicate(c)) {
>                 pop.addEntry(c);
>                 total++;
>                 
>                 // print only after adding an entry.
>                 pop.print();
>             }
>         }
>         //pop.killKB();
>     }
> }
> 
> God BLESS YOU!
>