import javax.swing.JOptionPane;
public class ExamplePage17
{
   public static void main(String[] args)
   {
      double balance = 10000.0;  //Current balance (amount)
      double interest;           //Interest amount each year
      int years = 0;             //#years to $20,000.00
      
      while ( balance < 20000.0 )
      {
         years = years + 1;            //Count another year
         interest = balance * 0.05;    //Figure the interest amount
         balance = balance + interest; //Update current balance
      }
      
      //System.out.println("It took " + years + " years at 5% to double $10,000");
      
      String info = "It took " + years + " years at 5% to double $10,000";
      JOptionPane.showMessageDialog(null, info);
   }
}