Java实现的简易记事本

本文实例讲述了java实现的简易记事本。分享给大家供大家参考。具体如下：

感觉这个没有自己以前用windows api写的好看了。。。

jdk version : 1.7.0

效果如下图所示：

源代码如下:

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(); 
  } 
}

希望本文所述对大家的java程序设计有所帮助。