解释下面代码: void Update() { if (Input.touchCount == 0) { if (finger_num != FingerIE.zero) { StopCoroutine(ie); ie = null; finger_num = FingerIE.zero; } }
时间: 2024-03-04 10:53:40 浏览: 49
这段代码是 Unity 引擎中的 MonoBehavior 类的一个方法,用于在每一帧渲染时调用。具体来说,这个方法会在游戏对象被实例化后,每一帧都会被 Unity 引擎调用一次。
这个方法中的代码首先判断当前屏幕上是否有触摸事件。如果没有,则会检查之前是否有手指在屏幕上,如果有,则停止之前的协程并将其清空,同时将当前手指数量设置为 0。
在这段代码中,可能有一些变量没有被声明或初始化,例如 finger_num 和 ie。根据代码中的语境,这两个变量很可能是在类的其他部分被声明和初始化的,所以需要查看其他部分的代码才能准确理解这段代码在做什么。不过,总的来说,这段代码的作用是在屏幕上没有手指触摸时停止之前的操作。
相关问题
String - find maximum occurring character in string Given a string S, find the maximum occurring character in the input string. e.g., if the input string is “test” then the function should return ‘t’. Input: hello world where: First-line represents the input string Output: l Explanation: As the letter l occurs the most number of times in the input string S. Assumptions: The length of the string S can be 0 to 10000. Input string S contains only lower case characters. Java
Here is a Java code that finds the maximum occurring character in a given string:
```
import java.util.HashMap;
public class MaxurringChar {
public void main(String[] args) String s = " world";
char result =OccurringChar(s);
System.out.println("Maximum occurring in the input string is: " + result);
}
static char getMaxOccurringChar(String) {
HashMap<Character, Integer> countMap = HashMap<>();
int maxCount = 0;
char maxChar = ' ';
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (countMap.containsKey(c)) {
int count = countMap.get(c) + 1;
countMap.put(c, count);
if (count > maxCount) {
maxCount = count;
maxChar = c;
}
} else {
countMap.put(c, 1);
}
}
return maxChar;
}
}
```
Explanation:
We use a HashMap to keep track of the count of each character in the given string. We iterate over the characters of the string and update the count of each character in the HashMap. We also keep track of the maximum occurring character and its count. Finally, we return the maximum occurring character.
已知数据库cake_db,包含用户表tbl_user,该表包括username(varchar,账号,primarykey),password(varchar,密码),realname(varchar,姓名),state(int,状态,1-正常,2-锁定),failcount(int,登陆失败次数)5个字段。 1.要求编写UserDao,实现 (1)用户的登录功能,方法定义如下: public User findByUsernameAndPassword(String username, String password); (2)修改用户状态的功能,方法声明如下: public void updateState(String username, int failCount); 2.编写login.html页面用于登录,要求包含1个表单,又账号和密码表单元素。 3.编写LoginServlet,获取login.html页面表单数据,并调用UserDao的登录功能,如果登录成功,跳转到main.html页面;如果登录失败则将该用户登陆失败次数加1,再跳回login.html页面。
1. UserDao的实现:
```java
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class UserDao {
// 数据库连接池
private ConnectionPool connectionPool;
public UserDao() {
connectionPool = ConnectionPool.getInstance();
}
/**
* 用户登录功能
* @param username 用户名
* @param password 密码
* @return 如果登录成功,返回用户对象;否则返回null
*/
public User findByUsernameAndPassword(String username, String password) {
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
User user = null;
try {
conn = connectionPool.getConnection();
String sql = "SELECT * FROM tbl_user WHERE username = ? AND password = ?";
ps = conn.prepareStatement(sql);
ps.setString(1, username);
ps.setString(2, password);
rs = ps.executeQuery();
if (rs.next()) {
user = new User();
user.setUsername(rs.getString("username"));
user.setPassword(rs.getString("password"));
user.setRealname(rs.getString("realname"));
user.setState(rs.getInt("state"));
user.setFailcount(rs.getInt("failcount"));
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (ps != null) {
try {
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
connectionPool.releaseConnection(conn);
}
}
return user;
}
/**
* 修改用户状态的功能
* @param username 用户名
* @param failCount 失败次数
*/
public void updateState(String username, int failCount) {
Connection conn = null;
PreparedStatement ps = null;
try {
conn = connectionPool.getConnection();
String sql = "UPDATE tbl_user SET state = ?, failcount = ? WHERE username = ?";
ps = conn.prepareStatement(sql);
ps.setInt(1, failCount >= 3 ? 2 : 1);
ps.setInt(2, failCount);
ps.setString(3, username);
ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (ps != null) {
try {
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
connectionPool.releaseConnection(conn);
}
}
}
}
```
2. login.html页面:
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Login</title>
</head>
<body>
<form action="login" method="POST">
<label>Username:</label>
<input type="text" name="username"><br>
<label>Password:</label>
<input type="password" name="password"><br>
<input type="submit" value="Login">
</form>
</body>
</html>
```
3. LoginServlet的实现:
```java
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class LoginServlet extends HttpServlet {
private UserDao userDao;
@Override
public void init() throws ServletException {
userDao = new UserDao();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 获取表单数据
String username = req.getParameter("username");
String password = req.getParameter("password");
// 调用UserDao的登录功能
User user = userDao.findByUsernameAndPassword(username, password);
if (user != null) {
// 登录成功,将用户信息存储到Session中
HttpSession session = req.getSession();
session.setAttribute("user", user);
// 跳转到main.html页面
resp.sendRedirect("main.html");
} else {
// 登录失败,将该用户登陆失败次数加1,再跳回login.html页面
HttpSession session = req.getSession();
Integer failCount = (Integer) session.getAttribute("failCount");
failCount = failCount == null ? 1 : failCount + 1;
session.setAttribute("failCount", failCount);
userDao.updateState(username, failCount);
resp.sendRedirect("login.html");
}
}
}
```