今天的作业 java IO练习，一个山寨记事本，没什么技术含量

/** 2011 08 29 java IO操作小练习* Notepad 山寨记事本*×很多人都写过的东西，没记错的话已经是第二次写了吧，没什么技巧，也没什么算法，纯属熟悉程序的练手，一直想写一个完整的，还是先把作业交了再说吧×一直想把程序尽量规范起来，希望能进步快点× blog:blog.csdn.net/hack2me* blog: youngershen.com/blog 需要翻墙* email:[e-mail]*/import java.util.*;import java.io.*;import javax.swing.*;import java.awt.event.*;import java.awt.*;public class NotePad extends JFrame{private  JMenu menu = null;private  JMenuBar bar = null;private  JMenuItem open = null;private  JMenuItem save = null;private  JMenuItem saveAs = null;private  JTextArea editArea = null;private BufferedReader reader = null;private BufferedWriter writer = null;private ArrayList<String> dumpString = new ArrayList<String>();private String fileName = null;private String buffer = null;private JFileChooser chooser = new JFileChooser();private File currentFile = null;private ArrayList<String> currentText = new ArrayList<String>();//成员初始化public NotePad(){super("NotePad By Younger.shen 20110829");menu = new JMenu("菜单");bar = new JMenuBar();open = new JMenuItem("打开");save = new JMenuItem("保存");saveAs = new JMenuItem("另存为");editArea = new JTextArea();setDefaultCloseOperation(EXIT_ON_CLOSE);initUI();getInit();}//事件初始化private void getInit(){saveAs.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){System.out.println("click the save button");chooser.setDialogTitle("保存文件");chooser.setDialogType(JFileChooser.SAVE_DIALOG);chooser.setCurrentDirectory(new File("./"));int flag = 0;try{ flag = chooser.showSaveDialog(null);}catch (HeadlessException ex){System.out.println("保存文件错误");}if(JFileChooser.APPROVE_OPTION == flag){File temp = chooser.getSelectedFile();fileName = temp.getName();dumpToFile();}}});save.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){//add later}});open.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){chooser.setDialogTitle("打开文件");chooser.setDialogType(JFileChooser.OPEN_DIALOG);int flag = 0;chooser.setCurrentDirectory(new File("./"));try{ flag = chooser.showOpenDialog(null);}catch (HeadlessException ex){System.out.println("保存文件错误");}if(JFileChooser.APPROVE_OPTION == flag){currentFile = chooser.getSelectedFile();fileName = currentFile.getName();ArrayList<String> t = openFile(fileName);for(int i=0;i<t.size();i++){editArea.append(t.get(i));editArea.append("\n");}}}});}//文件打开操作private ArrayList<String> openFile(String name ){try{reader = new BufferedReader(new FileReader(name));String temp = reader.readLine();while(temp != null){currentText.add(temp);temp = reader.readLine();}}catch(IOException e){System.out.println(e.toString());}finally{if(reader!=null){try{reader.close();}catch(IOException e){System.out.println("IO Error");}}}return currentText;}//UI初始化private void initUI(){bar.add(menu);menu.add(open);menu.add(save);menu.add(saveAs);setJMenuBar(bar);setLayout(null);add(editArea);editArea.setBounds(0,0,400,300);setVisible(true);setResizable(false);setSize(400,300);add(chooser);editArea.setEnabled(true);JScrollPane jScrollPane = null;JPanel jContentPane = new JPanel();jScrollPane = new JScrollPane();jContentPane.setLayout(null);            jContentPane.add(jScrollPane, null);            jScrollPane.setBounds(new Rectangle(0, 2, 400, 300));            jScrollPane.setViewportView(editArea);setContentPane(jContentPane);}//聚集字符串的工具方法private void gatherString(){buffer = editArea.getText();}//保存成文件public void dumpToFile(){gatherString();try{writer = new BufferedWriter(new FileWriter(fileName,true));writer.write(buffer,0,buffer.length());writer.write("\r");writer.write("\n");writer.flush();}catch(IOException e){System.out.println("dump error");}finally{try{writer.close();}catch(IOException e){System.out.println("IO Error");}}}//主方法这个不用看了public static void main(String[] args){new NotePad();}}