guiformat.java

《A first book of java》by Gary J.Bronson 北大出版社

import java.text.*;
import javax.swing.*;
public class GuiFormat
{
  public static void main(String[] args)
  {
    DecimalFormat num = new DecimalFormat("$,###.00");
    
    JOptionPane.showMessageDialog(null,
      "The result is " + num.format(25625.648),
      "Output Display",
      JOptionPane.INFORMATION_MESSAGE);
    System.exit(0);
  }
}