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这是代码，你可以自己调试一下。
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数据结构如下：
CREATE TABLE dtree (
id int,
pid int,
name varchar(200),
url varchar(200),
title varchar(200),
target varchar(200),
icon varchar(200),
iconopen varchar(200),
opened bit);
为了实现获取数据库变量功能，需要建立一个DTree类，并编译生成CLASS文件，放入\WEB-INF\classes文件夹下。
DTree类代码如下：
package work3;
public class DTree {
private int id;
private int pid;
private String name;
private String url;
private String title;
private String target;
private String icon;
private String iconOpen;
private int opened;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getPid() {
return pid;
}
public void setPid(int pid) {
this.pid = pid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getTarget() {
return target;
}
public void setTarget(String target) {
this.target = target;
}
public String getIcon() {
return icon;
}
public void setIcon(String icon) {
this.icon = icon;
}
public String getIconOpen() {
return iconOpen;
}
public void setIconOpen(String iconOpen) {
this.iconOpen = iconOpen;
}
public int getOpened() {
return opened;
}
public void setOpened(int opened) {
this.opened = opened;
}
}
work3.jsp代码如下：
%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%
%@ page import="java.sql.*"%
jsp:useBean id='settree' scope="application" class="work3.DTree" /
!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
""
html
head
meta http-equiv="Content-Type" content="text/html; charset=GB18030"
link rel="StyleSheet" href="dtree.css" type="text/css" /
script type="text/javascript" src="dtree.js"/script
titledTree in MySQL/title
/head
body
h2
Example
/h2
div class="dtree"
p
a href="javascript: d.openAll();"open all/a |
a href="javascript: d.closeAll();"close all/a
/p
script type="text/javascript"
!--
d = new dTree('d');
%
//驱动程序名
String driverName = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
//数据库用户名
String userName = "sa";
//密码
String userPwd = "1";
//数据库名
String dbName = "master";
//表名
String tableName = "dtree";
//连接字符串
String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName="+dbName;
//加载驱动
Class.forName(driverName).newInstance();
//连接数据库
java.sql.Connection conn = DriverManager.getConnection(url,userName,userPwd);
//得到Statement实例
java.sql.Statement statement = conn.createStatement();
//查询数据
String sql = "select * from " + tableName;
//返回结果
java.sql.ResultSet rs = statement.executeQuery(sql);
//获取变量
while (rs.next()) {
settree.setId(rs.getInt(1));
settree.setPid(rs.getInt(2));
settree.setName(rs.getString(3));
settree.setUrl(rs.getString(4));
settree.setTitle(rs.getString(5));
settree.setTarget(rs.getString(6));
settree.setIcon(rs.getString(7));
settree.setIconOpen(rs.getString(8));
settree.setOpened(rs.getInt(9));
if(settree.getPid()==0)
settree.setOpened(1);
%
d.add(%=settree.getId()%,%=settree.getPid()%,'%=settree.getName()%','%=settree.getUrl()%','%=settree.getTitle()%','%=settree.getTarget()%','','',%=settree.getOpened()%);
%
}
%
document.write(d);
//--
/script
/div
/body
/html
下面是WINDOW界面的代码，用JAVA SWING写的。
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class PlusWhile {
//主面板
private JFrame mainTop = null;
private JPanel inPanel = null; //输入面板
private JPanel outPanel = null;//输出面板
private JButton count = null; //按钮
private JTextField inText = null; // 输入文本框
private JTextField result = null;//结果文本框
private JLabel resultOut = null;//输出提示
private JLabel remindIn = null;//输入提示
//初始化方法
private void init() {
//组件实例化
mainTop = new JFrame("阶乘计算器");
inPanel = new JPanel();
outPanel = new JPanel();
count = new JButton("计算");
inText = new JTextField(10);
result = new JTextField(10);
resultOut = new JLabel("计算的结果：");
remindIn = new JLabel("请输入要计算的正整数：");
//添加输入组件
inPanel.add(remindIn);
inPanel.add(inText);
inPanel.add(count);
//添加输出组件
outPanel.add(resultOut);
outPanel.add(result);
result.setEnabled(false);
//设置布局样式
mainTop.setLayout(new BorderLayout());
//主面板添加组件
mainTop.add(inPanel, BorderLayout.NORTH);
mainTop.add(outPanel, BorderLayout.SOUTH);
//设置监听
count.addActionListener(new ButtonListener());
//设置屏显位置
mainTop.setLocation(350 , 300);
mainTop.pack();
mainTop.setVisible(true);
mainTop.setAlwaysOnTop(true);
//设置关闭事件
mainTop.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
//监听类
private class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent event) {
int inputNum = 0;
String input = inText.getText();
//若输入为非数字，提示错误
try {
inputNum = Integer.parseInt(input);
}catch(Exception e) {
inputNum = -1;
}
//输入数值小于0，提示错误
if(inputNum 0) {
inText.setText("请输入正确的数值！");
result.setText("");
}
else if(inputNum == 0) {//输入值为0处理
result.setText("1");
}
else {//输入值为正整数，计算阶乘
int temp = inputNum;
while(inputNum 1) {
temp *= --inputNum;
}
result.setText(temp + "");
}
}
}
//入口方法
public static void main(String[] args) {
new PlusWhile().init();
}
}
有什么不明白的继续补充，呵呵。 加点儿分不。
public class zoo{
String name;
int age;
public zoo(String a,int b){
name = a;
age = b;
}
public String getName(){
return name;
}
public int getAge(){
return age;
}
public static void main(String args[]) {
zoo animal1 = new zoo(fish,1);
zoo animal2 = new zoo(bird,2);
String m = animial1.getName();
String n = animial2.getName();
String p = animal1.age;
String q = animal2.age;
System.out.println("动物为 +m +年龄为+p+");
System.out.println("动物为 + n+年龄为+q+");
}
}
说明，本人只是自己输入的代码，并没有调试，只是告诉你一个框架或是模板，如果需要别的功能，自己添加即可。调试不过，可以在问我，我会告诉你的。
三叶玫瑰并不是植物，你也说啦，是专门研究数学的。其实是一种三叶玫瑰线的 java代码
S 3：
输入下面程序用于输出三叶玫瑰线的图形，三叶玫瑰线的参数方程为：
x = r * sin(3t)* sin(t);y = r *sin(3t) * sin(t) 其中: 0 = t = 2 * 3.14159
#include stdio.h
#include math.h
#define RADIUS 12
#define PII 3.14159
void main(void)
{
char tx[2 * RADIUS + 1][2 * RADIUS + 1];
int nT;
int nX;
int nY;
double dbD;
for(nX = 0; nX 2 * RADIUS + 1; nX++)
{
for(nY = 0; nY 2 * RADIUS + 1; nY++)
{
tx[nX][nY] = '';
}
}
for(nT = 0; nT = 360; nT += 4)
{
dbD = nT * PII / 180;
nX = (int)(RADIUS * sin(3 * dbD) * sin(dbD)) + RADIUS;
nY = (int)(RADIUS * sin(3 * dbD) * cos(dbD)) + RADIUS;
tx[nX][nY] = '*';
}
for(nX = 0; nX 2 * RADIUS + 1; nX++)
{
for(nY = 0; nY 2 * RADIUS + 1; nY++)
{
printf("%2c", tx[nX][nY]);
}
printf("\n");
}
}