Java 记事本程序.docx
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Java 记事本程序.docx
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Java记事本程序
Java记事本程序
Java学习2010-06-2415:
34:
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importjava.awt.*;
importjava.awt.event.*;
importjava.io.*;
importjava.awt.datatransfer.*;
classMyMenuBarextendsMenuBar{
publicMyMenuBar(Frameparent){
parent.setMenuBar(this);
}
publicvoidaddMenus(String[]menus){
for(inti=0;i add(newMenu(menus[i])); } publicvoidaddMenuItems(intmenuNumber,String[]items){ for(inti=0;i if(items[i]! =null) getMenu(menuNumber).add(newMenuItem(items[i])); elsegetMenu(menuNumber).addSeparator(); } } publicvoidaddActionListener(ActionListeneral){ for(inti=0;i for(intj=0;j getMenu(i).getItem(j).addActionListener(al); } } classMyFile{ privateFileDialogfDlg; publicMyFile(Frameparent){ fDlg=newFileDialog(parent,"",FileDialog.LOAD); } privateStringgetPath(){ returnfDlg.getDirectory()+"\\"+fDlg.getFile(); } publicStringgetData()throwsIOException{ fDlg.setTitle("打开"); fDlg.setMode(FileDialog.LOAD); fDlg.setVisible(true); BufferedReaderbr=newBufferedReader(newFileReader(getPath())); StringBuffersb=newStringBuffer(); Stringaline; while((aline=br.readLine())! =null) sb.append(aline+'\n'); br.close(); returnsb.toString(); } publicvoidsetData(Stringdata)throwsIOException{ fDlg.setTitle("保存"); fDlg.setMode(FileDialog.SAVE); fDlg.setVisible(true); BufferedWriterbw=newBufferedWriter(newFileWriter(getPath())); bw.write(data); bw.close(); } } classMyClipboard{ privateClipboardcb; publicMyClipboard(){ cb=Toolkit.getDefaultToolkit().getSystemClipboard(); } publicvoidsetData(Stringdata){ cb.setContents(newStringSelection(data),null); } publicStringgetData(){ Transferablecontent=cb.getContents(null); try{ return(String)content.getTransferData(DataFlavor.stringFlavor); //DataFlavor.stringFlavor会将剪贴板中的字符串转换成Unicode码形式的String对象。 //DataFlavor类是与存储在剪贴板上的数据的形式有关的类。 }catch(Exceptionue){} returnnull; } } classMyFindDialogextendsDialogimplementsActionListener{ privateLabellFind=newLabel("查找字符串"); privateLabellReplace=newLabel("替换字符串"); privateTextFieldtFind=newTextField(10); privateTextFieldtReplace=newTextField(10); privateButtonbFind=newButton("查找"); privateButtonbReplace=newButton("替换"); privateTextAreata; publicMyFindDialog(Frameowner,TextAreata){ super(owner,"查找",false); this.ta=ta; setLayout(null); lFind.setBounds(10,30,80,20); lReplace.setBounds(10,70,80,20); tFind.setBounds(90,30,90,20); tReplace.setBounds(90,70,90,20); bFind.setBounds(190,30,80,20); bReplace.setBounds(190,70,80,20); add(lFind); add(tFind); add(bFind); add(lReplace); add(tReplace); add(bReplace); setResizable(false); bFind.addActionListener(this); bReplace.addActionListener(this); addWindowListener(newWindowAdapter(){ publicvoidwindowClosing(WindowEvente){ MyFindDialog.this.dispose(); } }); }//构造函数结束 publicvoidshowFind(){ setTitle("查找"); setSize(280,60); setVisible(true); } publicvoidshowReplace(){ setTitle("查找替换"); setSize(280,110); setVisible(true); } privatevoidfind(){ Stringtext=ta.getText(); Stringstr=tFind.getText(); intend=text.length(); intlen=str.length(); intstart=ta.getSelectionEnd(); if(start==end)start=0; for(;start<=end-len;start++){ if(text.substring(start,start+len).equals(str)){ ta.setSelectionStart(start); ta.setSelectionEnd(start+len); return; } } //若找不到待查字符串,则将光标置于末尾 ta.setSelectionStart(end); ta.setSelectionEnd(end); } publicButtongetBFind(){ returnbFind; } privatevoidreplace(){ Stringstr=tReplace.getText(); if(ta.getSelectedText().equals(tFind.getText())) ta.replaceRange(str,ta.getSelectionStart(),ta.getSelectionEnd()); elsefind(); } publicvoidactionPerformed(ActionEvente){ if(e.getSource()==bFind) find(); elseif(e.getSource()==bReplace) replace(); } } classMyMemoextendsFrameimplementsActionListener{ privateTextAreaeditor=newTextArea();//可编辑的TextArea privateMyFilemf=newMyFile(this);//MyFile对象 privateMyClipboardcb=newMyClipboard(); privateMyFindDialogfindDlg=newMyFindDialog(this,editor); publicMyMemo(Stringtitle){//构造函数 super(title); MyMenuBarmb=newMyMenuBar(this); //添加需要的菜单及菜单项 mb.addMenus(newString[]{"文件","编辑","查找","帮助"}); mb.addMenuItems(0,newString[]{"新建","打开","保存",null,"全选"}); mb.addMenuItems(1,newString[]{"剪贴","复制","粘贴","清除",null,"全选"}); mb.addMenuItems(2,newString[]{"查找",null,"查找替换"}); mb.addMenuItems(3,newString[]{"我的记事本信息"}); add(editor);//为菜单项注册动作时间监听器 mb.addActionListener(this); addWindowListener(newWindowAdapter(){ publicvoidwindowClosing(WindowEvente){ MyMemo.this.dispose(); } });//分号不能忘了 }//构造函数完 publicvoidactionPerformed(ActionEvente){ Stringselected=e.getActionCommand();//获取菜单项标题 if(selected.equals("新建")) editor.setText(""); elseif(selected.equals("打开")){ try{ editor.setText(mf.getData()); }catch(IOExceptionie){} } elseif(selected.equals("保存")){ try{ mf.setData(editor.getText()); }catch(IOExceptionie){} } elseif(selected.equals("退出")){ dispose(); } elseif(selected.equals("剪贴")){ //将选中的字符串复制到剪贴板中并清除字符串 cb.setData(editor.getSelectedText()); editor.replaceRange("",editor.getSelectionStart(),editor.getSelectionEnd()); } elseif(selected.equals("复制")){ cb.setData(editor.getSelectedText()); } elseif(selected.equals("粘贴")){ Stringstr=cb.getData(); editor.replaceRange(str,editor.getSelectionStart(),editor.getSelectionEnd()); //粘贴在光标位置 } elseif(selected.equals("清除")){ editor.replaceRange("",editor.getSelectionStart(),editor.getSelectionEnd()); } elseif(selected.equals("全选")){ editor.setSelectionStart(0); editor.setSelectionEnd(editor.getText().length()); } elseif(selected.equals("查找")){ findDlg.showFind(); } elseif(selected.equals("查找替换")){ findDlg.showReplace(); } } publicstaticvoidmain(String[]args){ MyMemomemo=newMyMemo("记事本"); memo.setSize(300,300); memo.setVisible(true); } }
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