public char getGroupingSeparator()

// Java program to demonstrate
// the above method
  
import java.text.*;
import java.util.*;
  
public class DecimalFormatSymbolsDemo {
    public static void main(String[] args)
    {
  
        DecimalFormatSymbols dfs
            = new DecimalFormatSymbols();
  
        System.out.println("Character used for"
                           + " thousands separator: "
                           + dfs.getGroupingSeparator());
    }
}

Character used for thousands separator:,