Downloading more than one file in java Download Manager with ThreadPool

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I want to the user be able to download more than one Download in the DownloadManager .But it just allow one download process?What does cause it?

This is Main.java

public static void main(String[] args) throws MalformedURLException {
 
    System.out.println("Welcome to Download Manager.");
        int i=0;
        boolean newDownload=true;
        URL[] url =new URL[100] ;
        String s1,s2,s3;
        DownloadManagerSystem dms=new DownloadManagerSystem();
        while(newDownload){
            System.out.println("Enter a URL.");
            Scanner scan= new Scanner(System.in);
            s1=scan.nextLine();
            System.out.println(s1);
            url[i]= new URL(s1);
            dms.addNewDownload(url[i]);
            i++;
         System.out.println("Do you want to add new URL:YES or NO");
 
         Scanner scan2= new Scanner(System.in);
 
         s2=scan2.nextLine();
         if(s2=="YES"){
              newDownload=true;
          }
          else
          {
              newDownload=false;
 
          }
 
        }
    }
 
 

DownloadManager .java:

 private int threadPoolSize=10;//Limiting the number of working threads;
 
        private Download[] downloads;
 
        private ExecutorService tpes;
        private int id=0;
 
        public void  createThreadPool() throws MalformedURLException{
 
            tpes= Executors.newFixedThreadPool(threadPoolSize);
 
          }
        public void addNewDownloadToPool(URL url){
                downloads[id] = new Download(url,id);
                System.out.println("Download"+id+" is added to downloads list");
                tpes.execute(downloads[id]);
                id++;
                tpes.shutdown();
        }
 
        public DownloadManager() throws MalformedURLException {
 
                this.downloads = new Download[noOfDownloads];
                createThreadPool();
       }    
 
 
 

[r035198x]

Don't use == to compare Strings. Use the equals method instead.

[notfound]

@r035198x Thank you very much.It solved my question