临时资料

1、jdk就是j2se,jdk1.1.8版本以后改成为j2se，
下载地址：http://java.sun.com/j2se/downloads.html
2、jre是java运行时环境（jdk1.3版本以后都包含jre）不用单独下载
3、设置环境变量
安装了jdk以后，要配置环境变量
我的电脑->属性->高级->环境变量
添加以下环境变量(假定你的java安装在c:\jdk1.3）
java_home=c:\jdk1.3
classpath=.;c:\jdk1.3\lib\dt.jar;c:\jdk1.3\lib\tools.jar;（.;已经不能少，因为它代表当前路径)
path = c:\jdk1.3\bin
新开一个dos窗口，键入java和javac测试一下
4、简单测试程序


代码:--------------------------------------------------------------------------------
public class Test{
public static void main(String args[]){
System.out.println("Hello world!");
}
}
--------------------------------------------------------------------------------

javac Test.java
java Test

import java.applet.*;import java.awt.*;
public class Hello extends Applet
{
 String tom;
 public void init()
 {
  tom = "2201223";
 }
 public void paint(Graphics g)
 {
  if(tom.startsWith("220"))
   g.drawString("tom",10,19);
 }
}

/Files/zitiger/JEDPlus20.zip 

  五笔加加Plus  2.6
http://www.wbfans.net/Soft_Down.asp?UrlID=1&SoftID=26
/Files/zitiger/WallpaperTiger.rar

http://192.18.97.52/ECom/EComTicketServlet/BEGIN5C63504EA758E9ABC692C8FEE213D527/-2147483648/1100977263/1/636050/635870/1100977263/2ts+/westCoastFSEND/j2sdk-1.4.2_09-oth-JPR/j2sdk-1.4.2_09-oth-JPR:2/j2sdk-1_4_2_09-windows-i586-p.exe
import java.util.*;
class Hello
{
 public static void main(String args[])
 {
  String s = "i am a good boy";

  s = s.toLowerCase();
  
  StringTokenizer t = new StringTokenizer(s);

  System.out.print(t.countTokens());

  while(t.hasMoreTokens())
  {
   String str = t.nextToken();
   System.out.println(str);
   System.out.println(t.countTokens());
  }
 }
}

import java.util.*;
class Hello
{
 public static void main(String args[])
 {
  String s = "I am a good boy";
  
  char a[] = s.toCharArray();

  for(int i = 0; i < a.length; i++)
  {
   if(Character.isLowerCase(a[i]))
   {
    a[i] = Character.toUpperCase(a[i]);
   }
   else
   {
    a[i] = Character.toLowerCase(a[i]);
   }
  }

  s = new String(a);
  System.out.println(s);
 }
}

import java.text.NumberFormat;
class Hello
{
 public static void main(String args[])
 {
  double a = 1123.234;

  NumberFormat f = NumberFormat.getInstance();

  f.setMaximumFractionDigits(10);
  f.setMinimumIntegerDigits(3);
  
  String s = f.format(a);

  System.out.println(s);
 }
}

import java.io.*;
class Hello
{
 public static void main(String args[])
 {
  File f1 = new File("C:\\Documents and Settings\\Admin\\桌面\\Java","Hello.java");
  File f2 = new File("C:\\Documents and Settings\\Admin\\桌面\\Java");

  System.out.println(f1.canRead());
  System.out.println(f1.length());
  System.out.println(f1.getAbsolutePath());
  System.out.println(f2.isDirectory());
 }
}


import java.io.*;

class FA implements FilenameFilter
{
 String str = "";
 FA(String s)
 {
  str += "." + s;
 }

 public boolean accept(File dir, String name)
 {
  return name.endsWith(str);
 }
}
class Hello
{
 public static void main(String args[])
 {
 
  File f2 = new File("C:\\Documents and Settings\\Admin\\桌面\\Java");

  FA fa = new FA("java");

  String fileName[] = f2.list(fa);

  for(int i = 0; i<fileName.length; i++)
  {
   System.out.println(fileName[i]);
  }
 }
}

import java.io.*;

class Hello
{
 public static void main(String args[])
 {
 
  try
  {
   File f = new File("C:\\Documents and Settings\\Admin\\桌面\\Java","a.txt");

   FileWriter out = new FileWriter(f);
   out.write("aa");
   out.close();

  }
  catch(IOException e)
  {
   System.out.println("IO error");
  }
 }
}



import java.io.*;
import java.awt.*;
import java.awt.event.*;

class EWindow extends Frame implements ActionListener
{
 TextArea text;
 Button buttonRead,buttonWrite;
 BufferedReader bufferIn;
 FileReader in;
 BufferedWriter bufferOut;
 FileWriter out;
 
 EWindow()
 {
  super("流的读取");
  text = new TextArea(10,10);
  text.setBackground(Color.cyan);
  buttonRead = new Button("Read");
  buttonRead.addActionListener(this);
  buttonWrite = new Button("Write");
  buttonWrite .addActionListener(this);
  setLayout(new BorderLayout());
  setSize(340,340);
  setVisible(true);
  add(text,BorderLayout.CENTER);
  Panel pNorth = new Panel();
  pNorth.add(buttonRead);
  pNorth.add(buttonWrite);
  pNorth.validate();
  add(BorderLayout.NORTH,pNorth);
  addWindowListener(new WindowAdapter()
  {
   public void windowClosing(WindowEvent e)
   {
    System.exit(0);
   }
  });
 }

 public void actionPerformed(ActionEvent e)
 {
  String s;
  if(e.getSource() == buttonRead)
  {
   try
   {
    text.setText(null);
    File f = new File("C:\\Documents and Settings\\Admin\\桌面\\Java","Hello.txt");
    in = new FileReader(f);
    bufferIn = new BufferedReader(in);
    while((s = bufferIn.readLine()) != null)
    {
     text.append(s + '\n');
    }
    bufferIn.close();
    in.close();
   }
   catch(IOException exp)
   {
    System.out.println(exp);
   }
  }
  else if(e.getSource() == buttonWrite)
  {
   try
   {
    File f = new File("C:\\Documents and Settings\\Admin\\桌面\\Java","Hello.txt");
    FileWriter out = new FileWriter(f);
    BufferedWriter bufferOut = new BufferedWriter(out);
    bufferOut.write(text.getText(),0,(text.getText()).length());
    bufferOut.flush();
    bufferOut.close();
    out.close();
   }
   catch(IOException exp)
   {
    System.out.println(exp);
   }
  }
 }
}
class Hello
{
 public static void main(String args[])
 {
 
  EWindow w = new EWindow();
  w.validate();
 }
}

import java.io.*;
class Hello2
{
 public static void main(String args[])
 {
  try
  {
   Runtime ce = Runtime.getRuntime();
   ce.exec("java Hello");

   File f = new File("C://WINDOWS","NOTEPAD.exe");
   ce.exec(f.getAbsolutePath());
  }
  catch(Exception e)
  {}
 }
}

import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.*;
import javax.swing.JOptionPane;

class InputArea extends Panel implements ActionListener
{
 File f = null;
 RandomAccessFile out;
 Box baseBox,boxV1,boxV2;
 TextField name,email,phone;
 Button button;
 InputArea(File f)
 {
  setBackground(Color.cyan);
  this.f = f;
  name = new TextField(12);
  email = new TextField(12);
  phone = new TextField(12);
  button = new Button("录入");
  button.addActionListener(this);
  boxV1 = Box.createVerticalBox();
  boxV1.add(new Label("name"));
  boxV1.add(Box.createVerticalStrut(8));
  boxV1.add(new Label("email"));
  boxV1.add(Box.createVerticalStrut(8));
  boxV1.add(new Label("phone"));
  boxV1.add(Box.createVerticalStrut(8));
  boxV1.add(new Label("submit"));
  boxV1.add(Box.createVerticalStrut(8));

  boxV2 = Box.createVerticalBox();
  boxV2.add(name);
  boxV2.add(Box.createVerticalStrut(8));
  boxV2.add(email);
  boxV2.add(Box.createVerticalStrut(8));
  boxV2.add(phone);
  boxV2.add(Box.createVerticalStrut(8));
  boxV2.add(button);
  boxV2.add(Box.createVerticalStrut(8));

  baseBox = Box.createHorizontalBox();
  baseBox.add(boxV1);
  baseBox.add(Box.createHorizontalStrut(8));
  baseBox.add(boxV2);

  add(baseBox);
 }

 public void actionPerformed(ActionEvent e)
 {
  try
  {
   RandomAccessFile out = new RandomAccessFile(f,"rw");
   if(f.exists())
   {
    long length = f.length();
    out.seek(length);
   }
   out.writeUTF("Name" + name.getText());
  // System.out.println(name.getText());
  // JOptionPane.showMessageDialog(this,name.getText(),name.getText(),JOptionPane.WARNING_MESSAGE);
   out.writeUTF("Email" + email.getText());
   out.writeUTF("Phone" + phone.getText());
   out.close();
  }
  catch(IOException ee)
  {}
 }
}
public class Hello extends Frame implements ActionListener
{
 File file = null;
 MenuBar bar;
 Menu fileMenu;
 MenuItem 录入,显示;
 TextArea show;
 InputArea inputMessage;
 CardLayout card = null;
 Panel pCenter;
 Hello()
 {
  file = new File("Hello.txt");
  录入 = new MenuItem("录入");
  显示 = new MenuItem("显示");
  bar = new MenuBar();
  fileMenu = new Menu("选项");
  fileMenu.add(录入);
  fileMenu.add(显示);
  bar.add(fileMenu);
  setMenuBar(bar);
  录入.addActionListener(this);
  显示.addActionListener(this);
  inputMessage = new InputArea(file);
  show = new TextArea(12,20);
  card = new CardLayout();
  pCenter = new Panel();
  pCenter.setLayout(card);
  pCenter.add("录入",inputMessage);
  pCenter.add("显示",show);

  add(pCenter,BorderLayout.CENTER);
  addWindowListener(new WindowAdapter()
  {
   public void windowClosing(WindowEvent e)
   {
    System.exit(0);
   }
  });

  setVisible(true);
  setBounds(100,50,420,380);
  validate();

 }
 
 public void actionPerformed(ActionEvent e)
 {
  if(e.getSource() == 录入)
  {
   card.show(pCenter,"录入");
  }
  else if(e.getSource() == 显示)
  {
   int number =1 ;
   card.show(pCenter,"显示");
   try
   {
    RandomAccessFile in = new RandomAccessFile(file,"r");
    show.append("\n" + number );
    String 姓名 = null;
    while((姓名 = in.readUTF()) != null)
    {
    // show.append("\n" + number + " "+ 姓名);
    // show.append(in.readUTF());
    // show.append(in.readUTF());
     show.append("\n------------------");
     number++;
    }
        show.append("\n" + number );

    in.close();
   }
   catch(Exception ee)
   {
  // JOptionPane.showMessageDialog(this,ee.,name.getText(),JOptionPane.WARNING_MESSAGE);
   
   }
  } 
 }
 public static void main(String args[])
 {
  new Hello();
 }
}

import java.sql.*;

public class Hello
{
 public static void main(String args[])
 {
  Connection con;
  Statement sql;
  ResultSet rs;
  try
  {
   Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
  }
  catch(ClassNotFoundException e)
  {
   System.out.println(""+e);
  }
  try
  {
   con = DriverManager.getConnection("jdbc:odbc:java","","");
   sql = con.createStatement();
   rs = sql.executeQuery("SELECT * FROM Customers");
   while(rs.next())
   {
    String number = rs.getString(1);//getInt,getDate
    System.out.println(number);
   }
   con.close();
  }
  catch(SQLException el)
  {
   System.out.println(""+el);
  }
 }
}