我的第一个实用的java应用程序

import  java.awt.*;import  java.awt.event.*;import javax.swing.*;import  javax.swing.event.ChangeEvent;import  javax.swing.event.ChangeListener;import  java.io.*;import java.nio.file.Files; public class text{public static void main(String args[ ]){new FirstWindow("文本查看器");}}  class FirstWindow extends JFrame implements ActionListener{/** *  */private static final long serialVersionUID = 1L;JMenuBar menubar;JMenu menu1,menu2,menu3,menu4,menu5;JMenuItem item1,item2,item3,item4,item5,item6,item7,item8,item9,item10,item11;JTextArea text=new JTextArea();//文本框long x=0,y[]=new long[100];static int fontsize=15;static int i=0;String path; FirstWindow(String s){setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);JPanel jp=new JPanel();//面板this.setResizable(false);JScrollPane jsp=new JScrollPane(text);//滚动条GridLayout grid=new GridLayout(1,1);//面板布局setTitle(s);                       //窗口标题setSize(1000,615);                 //窗口大小setLocation(200,80);               //窗口位置y[0]=0;text.setLineWrap(true);            //自动换行jp.setBounds(0,0,980,550);         //面板大小jp.setLayout(grid);                //面板获得布局add(jp);                          //添加面板jp.add(jsp);                      //面板添加滚动条text.setEditable(true);           //可编辑setVisible(true);                 //窗口可视menubar=new JMenuBar();           //菜单栏setJMenuBar(menubar);             //添加菜单栏menu1=new JMenu("文件");     menu2=new JMenu("选项");menu3=new JMenu("字体");menu4=new JMenu("书签");menu5=new JMenu("关于");item1=new JMenuItem("打开");item2=new JMenuItem("关闭");item3=new JMenuItem("下一页");item4=new JMenuItem("上一页");item5=new JMenuItem("字体颜色");item6=new JMenuItem("背景颜色");item7=new JMenuItem("字体变大");item8=new JMenuItem("字体变小");item9=new JMenuItem("添加书签");item10=new JMenuItem("读取书签");item11=new JMenuItem("关于软件");menu1.add(item1);menu1.add(item2);menu2.add(item3);menu2.add(item4);menu2.add(item5);menu2.add(item6);menu3.add(item7);menu3.add(item8);menu4.add(item9);menu4.add(item10);menu5.add(item11);menubar.add(menu1);menubar.add(menu2);menubar.add(menu3);menubar.add(menu4);menubar.add(menu5);item1.addActionListener(this);item2.addActionListener(this);item3.addActionListener(this);item4.addActionListener(this);item5.addActionListener(this);item6.addActionListener(this);item7.addActionListener(this);item8.addActionListener(this);item9.addActionListener(this);item10.addActionListener(this);item10.addActionListener(this);item11.addActionListener(this);}public void actionPerformed(ActionEvent e){if(e.getSource()==item1){JFileChooser file = new JFileChooser ("*.txt");int result=file.showOpenDialog(null);if(result == JFileChooser.APPROVE_OPTION) {path= file.getSelectedFile().getAbsolutePath();    this.setTitle(path);    text.setText(" ");    new opens(path);    text.setEditable(false);    }   }else if(e.getSource()==item3){text.setText(" "); new next(path);}else if(e.getSource()==item2){System.exit(0);}else if(e.getSource()==item4){text.setText(" ");new up(path);}else if(e.getSource()==item5){new color();}else if(e.getSource()==item6){new colorback();}else if(e.getSource()==item7){fontsize=fontsize+3;new font(fontsize);}else if(e.getSource()==item8){fontsize=fontsize-3;new font(fontsize);}else if(e.getSource()==item9){new addplace();}else if(e.getSource()==item10){text.setText(" ");new readplace();}else if(e.getSource()==item11){new about();}}class opens{int n=0; opens(String path){ try {RandomAccessFile input=new RandomAccessFile(path,"r");  while(n<1000){String str=input.readLine();byte b[]=str.getBytes("iso-8859-1");String content=new String(b);text.append(content);text.append("\n");n=n+1;item4.setEnabled(false);    x=input.getFilePointer();}i=1;y[i]=x;text.setCaretPosition(0);} catch (FileNotFoundException e1) {// TODO Auto-generated catch blocke1.printStackTrace();} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}} class next{ next(String path){ try {int n=0;RandomAccessFile input=new RandomAccessFile(path,"r");input.seek(x);while(n<1000){String str=input.readLine();byte b[]=str.getBytes("iso-8859-1");String content=new String(b);text.append(content);text.append("\n");n=n+1;item4.setEnabled(true);    x=input.getFilePointer();   }i+=1;y[i]=x;text.setCaretPosition(0);} catch (FileNotFoundException e1) {// TODO Auto-generated catch blocke1.printStackTrace();} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}  }class up{up(String path){ try {int n=0;RandomAccessFile input=new RandomAccessFile(path,"r");input.seek(y[i-2]);while(n<1000){String str=input.readLine();byte b[]=str.getBytes("iso-8859-1");String content=new String(b);text.append(content);text.append("\n");n=n+1;    x=input.getFilePointer();   }i-=1;text.setCaretPosition(0);} catch (FileNotFoundException e1) {// TODO Auto-generated catch blocke1.printStackTrace();} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}} class turnto{turnto(String path,long point){try {int n=0;RandomAccessFile input=new RandomAccessFile(path,"r");input.seek(point);while(n<1000){String str=input.readLine();byte b[]=str.getBytes("iso-8859-1");String content=new String(b);text.append(content);text.append("\n");n=n+1;item4.setEnabled(false);x=input.getFilePointer();}text.setCaretPosition(0);} catch (FileNotFoundException e1) {// TODO Auto-generated catch blocke1.printStackTrace();} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}}} class color extends JFrame implements ChangeListener{JColorChooser tcc = new JColorChooser();color(){this.setBounds(200,200,500,400);setVisible(true);setTitle("选择颜色");add(tcc, BorderLayout.PAGE_END);tcc.getSelectionModel().addChangeListener(this);}@Overridepublic void stateChanged(ChangeEvent e) {// TODO Auto-generated method stubColor newForegroundColor = tcc.getColor();        text.setForeground(newForegroundColor);}}class colorback extends JFrame implements ChangeListener{JColorChooser tcc = new JColorChooser();colorback(){this.setBounds(200,200,500,400);setVisible(true);setTitle("选择颜色");add(tcc, BorderLayout.PAGE_END);tcc.getSelectionModel().addChangeListener(this);}@Overridepublic void stateChanged(ChangeEvent e) {// TODO Auto-generated method stubtext.setForeground(Color.RED);Color newForegroundColor = tcc.getColor();text.setBackground(newForegroundColor);}}class font {font(int fontsize){Font font = new Font("微软雅黑",0,fontsize);text.setFont(font);}}class setfont extends JFrame{setfont(){JFrame jf =new JFrame();JPanel jp=new JPanel();}}class addplace{addplace(){   File f = new File("D:\\place.txt");   if (!f.exists())    {    try {f.createNewFile();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}   }   try {FileOutputStream output=new FileOutputStream(f);String outstring=String.valueOf(y[i-1]);byte b[]=outstring.getBytes();output.write(b);} catch (FileNotFoundException e1) {// TODO Auto-generated catch blocke1.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}            }}class readplace{long point;readplace(){try {RandomAccessFile inputfile=new RandomAccessFile("D:\\place.txt","r");String input=inputfile.readLine();point=Long.parseLong(input);new turnto(path,point);} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}} class about extends JFrame implements ActionListener{about(){this.setUndecorated(true);GridLayout lay=new GridLayout(3,1);this.setBounds(400, 100,200,200);this.setVisible(true);JPanel p=new JPanel();p.setLayout(lay);JLabel l1=new JLabel("               version:1.0");JLabel l2=new JLabel("               by:poklau");JButton button=new JButton("确定");p.add(l1);p.add(l2);p.add(button);add(p);button.addActionListener(this);}public void actionPerformed(ActionEvent e){this.dispose();}  } }

第一个java实用的应用程序，完成与2013年寒假。