public class test5 extends JFrame{
 
	private JMenuBar menuBar;
	//菜單欄
	private JMenu menu_File,menu_Edit,menu_Help,menu_Format;
	//菜單欄內(nèi)的菜單
	private JMenuItem item_new,item_open,item_save,item_exit;
	//對(duì)于file菜單的子項(xiàng)
	private JMenuItem item_undo,item_cut,item_copy,item_stick,item_delete;
	//對(duì)于edit菜單的子項(xiàng)
	private JMenuItem item_about;
	//對(duì)于help菜單的子項(xiàng)
	private JMenuItem item_word_format;
	
	
	public test5() {
		initMenuBar();
		
		this.setJMenuBar(menuBar);
		this.setSize(800,600);
		this.setTitle("自定義文本編輯器");
		this.setVisible(true);
		this.setLocationRelativeTo(null);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	
	/**
	 * 對(duì)menubar進(jìn)行初始化，這里有一些小的快捷方式的設(shè)置
	 * 大家可以考慮對(duì)所有的組件都設(shè)置一下
	 * 兩種形式：
	 * menu_File.setMnemonic('f'); 對(duì)menu
	 * item_word_format.setAccelerator(KeyStroke.getKeyStroke('F',java.awt.Event.CTRL_MASK,false)); 對(duì)item
	 */
	public void initMenuBar() {
		menuBar = new JMenuBar();
		menu_File = new JMenu("文件(F)");
		menu_File.setMnemonic('f');//f+alt打開(kāi)
		item_new = new JMenuItem("新建");
		item_open = new JMenuItem("打開(kāi)");
		item_save = new JMenuItem("保存");
		item_exit = new JMenuItem("退出");
		menu_File.add(item_new);
		menu_File.add(item_open);
		menu_File.add(item_save);
		menu_File.add(item_exit);
		//File 菜單
		
		menu_Edit = new JMenu("編輯(E)");
		menu_Edit.setMnemonic('e');
		item_undo = new JMenuItem("撤銷");
		item_cut = new JMenuItem("剪切");
		item_copy = new JMenuItem("復(fù)制");
		item_stick = new JMenuItem("粘貼");
		item_delete = new JMenuItem("刪除");
		menu_Edit.add(item_undo);
		menu_Edit.add(item_cut);
		menu_Edit.add(item_copy);
		menu_Edit.add(item_stick);
		menu_Edit.add(item_delete);
		//Edit 菜單
		
		menu_Help = new JMenu("幫助(H)");
		menu_Help.setMnemonic('h');
		item_about = new JMenuItem("關(guān)于");
		menu_Help.add(item_about);
		//Help 菜單
		
		menu_Format = new JMenu("格式(O)");
		menu_Format.setMnemonic('o');
		item_word_format = new JMenuItem("字體(F)");
		item_word_format.setAccelerator(KeyStroke.getKeyStroke('F',java.awt.Event.CTRL_MASK,false));//給item添加快捷鍵
		menu_Format.add(item_word_format);
		menuBar.add(menu_File);
		menuBar.add(menu_Edit);
		menuBar.add(menu_Format);
		menuBar.add(menu_Help);
	}
	
	public static void main(String[] args) {
		test5 t5 = new test5();
	}
}

public class test5 extends JFrame{
 
	...

 
	private static JTextArea edit_text_area;
	//private JTextArea edit_text_area;
	
	//編輯區(qū)域
	private JScrollPane scroll_bar;
	//可滾動(dòng)的pane 里面添加edit_text_area就可以變?yōu)橐粋€(gè)可以滾動(dòng)的文本框，JScrollPane是一個(gè)pane，同時(shí)可以設(shè)置方向
	
	public test5() {
		initMenuBar();
		initEditArea();
		
		this.setJMenuBar(menuBar);
		this.setSize(800,600);
		
		this.add(scroll_bar);
		
		this.setTitle("自定義文本編輯器");
		this.setVisible(true);
		this.setLocationRelativeTo(null);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	
	
	/**
	 * 初始化編輯區(qū)域
	 * 用scrollpane裝textarea
	 * 同時(shí)對(duì)pane設(shè)置方向
	 */
	public void initEditArea() {
		edit_text_area = new JTextArea();
		scroll_bar = new JScrollPane(edit_text_area);
		scroll_bar.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
	}
	
	
	public void initMenuBar() {
		...
	}
	
	
	
	public static void main(String[] args) {
		test5 t5 = new test5();
	}
	
	
 
}