Count the character in java

Count characters by implementing thread

import java.util.*;
class  CountCharacters {
    public static void count(final String str){
    Runnable readRun1 = new Runnable() {
      public void run() {
          try{
          Thread.sleep(5000);
          String st=str.replaceAll(" ", "");
  char ch[]=st.toCharArray();
  int count=ch.length;
  System.out.println("Total Characters: "+count);
       } catch(Exception ex) {
       }  
      }
    };
    Thread thread1 = new Thread(readRun1);
    thread1.start();
    }
    public static void main(String[] args) throws Exception{
  Scanner input=new Scanner(System.in);
  System.out.print("Please enter string ");
  String str=input.nextLine();
  count(str);
    }
}