java记事本代码

1、/Java记事本import java.awt.event.ActionListener;import java.util.EventListener;import java.awt.event.*;import java.awt.*;import java.io.*;import java.lang.*;import java.awt.datatransfer.*;import javax.swing.*;public class NotePad extends JFrame implements ActionListener MenuBar menuBar = new MenuBar();

2、 Menu file = new Menu(文件), edit = new Menu(编辑), help = new Menu(帮助); MenuItem menuItem = new MenuItem(新建), new MenuItem(打开), new MenuItem(保存), new MenuItem(退出), new MenuItem(全选), new MenuItem(复制), new MenuItem(剪切), new MenuItem(粘贴), new MenuItem(帮助) ; TextArea textArea = new TextArea(); String fileN

3、ame = 未命名; Toolkit toolKit = Toolkit.getDefaultToolkit(); Clipboard clipboard = toolKit.getSystemClipboard(); /打开 private FileDialog openFileDialog = new FileDialog(this,打开文件,FileDialog.LOAD); private FileDialog saveFileDialog = new FileDialog(this,保存文件,FileDialog.SAVE); public static void main(Stri

4、ng args) NotePad MyEdit = new NotePad(); MyEdit.show(); public NotePad() setTitle(java记事本); setFont(new Font(宋体,Font.PLAIN,15); setBackground(Color.gray); setSize(500,500); setLocation(200, 200); setMenuBar(menuBar); menuBar.add(file); menuBar.add(edit); menuBar.add(help); /添加子项目 for(int i=0;i4;i+)

5、file.add(menuItemi); edit.add(menuItemi+4); /添加子项目 help.add(menuItem8); add(textArea); /添加按钮监听 addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) e.getWindow().dispose();/完全释放 System.exit(0); ); /添加动作监听 for(int i=0;imenuItem.length;i+) menuItemi.addActionListener(this); p

6、ublic void actionPerformed(ActionEvent e) Object eventSource = e.getSource(); if(eventSource = menuItem0)/新建 textArea.setText(欢迎使用java版记事本，此记事本含有未知BUG一堆，暂未测试！); else if(eventSource = menuItem1)/打开 openFileDialog.show(); fileName = openFileDialog.getDirectory()+openFileDialog.getFile(); if(fileName !

7、= null) openFile(fileName); else if(eventSource =menuItem2)/保存 saveFileDialog.show(); fileName = saveFileDialog.getDirectory()+saveFileDialog.getFile(); if(fileName !=null) writeFile(fileName); else if(eventSource=menuItem3)/退出 if(textArea.getText().length()!=0)/退出时保存 saveFileDialog.show(); fileName

8、 = saveFileDialog.getDirectory()+saveFileDialog.getFile(); if(fileName !=null) writeFile(fileName); else System.exit(0); else if(eventSource = menuItem4)/全选 textArea.selectAll(); else if(eventSource = menuItem5)/复制 String text = textArea.getSelectedText(); StringSelection selection= new StringSelect

9、ion(text); clipboard.setContents(selection,null); else if(eventSource = menuItem6)/剪切 String text = textArea.getSelectedText(); StringSelection selection = new StringSelection(text); clipboard.setContents(selection,null); textArea.replaceText(,textArea.getSelectionStart(), textArea.getSelectionEnd()

10、; else if(eventSource = menuItem7)/粘贴 Transferable contents = clipboard.getContents(this); if(contents=null) return; String text; text=; try text = (String)contents.getTransferData(DataFlavor.stringFlavor); catch(Exception ex) textArea.replaceText(text, textArea.getSelectionStart(),textArea.getSelec

11、tionEnd(); else if(eventSource = menuItem8) /帮助信息 textArea.setText(); /读文件 public void openFile(String fileName) try File file = new File(fileName); FileReader readIn = new FileReader(file); int size = (int)file.length(); int charsRead = 0; char content = new charsize; while(readIn.ready() charsRead += readIn.read(content,charsRead,size-charsRead); readIn.close(); textArea.setText(new String(content,0,charsRead); catch(Exception e) System.out.println(读取文件失败!); /写文件 public void writeFile(String