This article describes a simple notepad implemented in Java. Share it with everyone for your reference. The details are as follows:
I feel that this is not as good-looking as the one I wrote using Windows API before. . .
JDK Version: 1.7.0
The effect is as shown below:
The source code is as follows:
import java.io.*; import java.awt.*; import java.awt.event.*; /** * The Main Window * @author Neo Smith */ class PadFrame extends Frame { private MenuBar mb; private Menu menuFile; private Menu menuEdit; private MenuItem[] miFile; private TextArea ta; final private Frame frame = this; /** * The inner class * Message Handle */ class EventExit implements ActionListener { public void actionPerformed(ActionEvent e) { System.exit(0); } } class SystemExit extends WindowAdapter { public void windowClosing(WindowEvent e) { System.exit(0); } } class EventMenuClose implements ActionListener { public void actionPerformed( ActionEvent e) { ta.setText(null); } } class EventOpenFile implements ActionListener { public void actionPerformed(ActionEvent e) { //Create the OpenFile Dialog FileDialog dlg = new FileDialog(frame,"Open Files",FileDialog.LOAD); dlg.show(); String strPath; if((strPath = dlg.getDirectory() ) != null) { //get the full path of the selected file strPath += dlg.getFile(); //open the file try { FileInputStream fis = new FileInputStream(strPath); BufferedInputStream bis = new BufferedInputStream(fis); byte[] buf = new byte[3000]; int len = bis.read(buf ); ta.append(new String(buf,0,len)); bis.close(); } catch(Exception ex) { ex.printStackTrace(); } } } } /** * Construction Method * Adding Menu and TextArea components * @param strTitle */ public PadFrame(String strTitle) { super(strTitle); this.setLocation(400,200); this.setSize(900, 630); //Create the Menu Bar mb = new MenuBar(); menuFile = new Menu("File"); menuEdit = new Menu("Edit"); miFile = new MenuItem[]{new MenuItem("Open"),new MenuItem("Close"),new MenuItem("Exit")}; this .setMenuBar(mb); mb.add(menuFile); mb.add(menuEdit); for(int i = 0; i < miFile.length ; ++i) { menuFile.add(miFile[i]); } //Add event handle setMenuEventHandle(new EventExit(),"File",2); setMenuEventHandle(new EventOpenFile(),"File", 0); setMenuEventHandle(new EventMenuClose(),"File",1); this.addWindowListener(new SystemExit()); //add the TextArea component ta = new TextArea(30,30); this.add(ta); } public void setMenuEventHandle(ActionListener al,String strMenu,int index) { if(strMenu == "File ") { miFile[index].addActionListener(al); } } public int getMenuItemAmount(String strMenu) { if("File" == strMenu) { return miFile.length; } return -1; } public static void main(String[] args) { PadFrame f = new PadFrame("NotePad"); f.show(); } }I hope this article will be helpful to everyone’s Java programming.