package chat;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class FontChooser extends JFrame{  JInternalFrame fontChooserFrame=null;  JDesktopPane desktopPane=null;  JButton button;  int inset = 50;  public FontChooser(){    button=new JButton("確定");    fontChooserFrame=new JInternalFrame("字體對話框",false,true,false,false);    fontChooserFrame.setSize(300,300);    fontChooserFrame.setVisible(true);    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();       setBounds(inset, inset,                 screenSize.width  - inset*2,                 screenSize.height - inset*2);    desktopPane=new JDesktopPane();    fontChooserFrame.getContentPane().add(button);    desktopPane.add(fontChooserFrame);    this.getContentPane().add(desktopPane);  }  public static void main(String[] args) {    FontChooser fontChooser=new FontChooser();    fontChooser.setVisible(true);  }}