public void setNaN(String NaN)

// 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("Current String "
                           + "used for NaN: "
                           + dfs.getNaN());
  
        String NaN = "*";
  
        dfs.setNaN(NaN);
  
        System.out.println("Updated String "
                           + "used for NaN: "
                           + dfs.getNaN());
    }
}

Current String used for NaN: ?
Updated String used for NaN: *