public?class?關閉窗口{
????JFrame?jf;
????//Inner?class?for?Window?Closing
????class?WindowCloser?extends?WindowAdapter
????{
??????public?void?windowClosing(WindowEvent?we?)?
??????{
??????????//print?a?message
??????????System.out.println("Oh!Im?Finished");
??????????//exit?the?application
??????????System.exit(0);
??????}
????}
????關閉窗口()
????????????{
???????????????//?create?a?new?frame
????????????????jf?=?new?JFrame();
????????????????jf.setVisible(true);
????????????????jf.setSize(555,555);
????????????????jf.addWindowListener(new?WindowCloser());
????????????}
????public?static?void?main(String[]?args)?{
????????關閉窗口?obj?=?new?關閉窗口();
????}
}在這段程序語句中，class?WindowCloser?extends?WindowAdapter這個是什么意思？在這個語句中，public class 關閉窗口{} ? 和 ??關閉窗口(){} ?代表的是什么意思？是不是和C語言中的主函數以及函數定義這兩個大模塊的意思差不多？？？
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