包含标签:Java 的文章
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Java Set. Toarray() method: create an array with all the objects in the set collection
Grammar 1 toArray() Example public static void main(String[] args){ Set set = new HashSet(); //定义Set集合对象…… -
Java Set. Add() method: adds an object to the set collection
add(E e) Example public static void main(String[] args){ Set set = new HashSet(); //定义Set集合对象 set.a…… -
JSP Response. Getlastaccessedtime() method: get the last access time of the session
getLastAccessedTime() Example <% long timeNum = session.getLastAccessedTime(); Date date = new Date(timeNum…… -
Solutions to Java non thread safety problems
package ch14; public class LoginCheck { private static String username; private static String password;…… -
JSP Request. Getcookies() method: get cookie object
getCookies() Example <% Cookie[] cookies = request.getCookies(); out.println("客户端包含"+cookies.length+"…… -
Java ResultSet. GetString () method: get the data of string type
Grammar 1 getString(int columnIndex) Example Connection conn = …… //省略部分代码 String sql = "SELECT username,pwd…… -
JSP Exception. GetMessage () method: get exception message text
getMessage() Example Typical application -
JSP config. Getinitparameternames() method: get the names of all initial parameters
getInitParameterNames() Example <% Enumeration names = config.getInitParameterNames(); while(names.hasMoreE…… -
What kind of programming language is Java?
Java is a simple, object-oriented, interpretive, robust, safe, naturally structured, portable, high-performance, multi…… -
Java replace() method: string replacement
Grammar 1 replace(char oldChar,char newChar); Example String str = "C语言中文网"; str = str.replace("C语言中文网","…… -
JSP Request. Getrequestedsessionid() method: get the session ID value of the website visited by the client
getRequestedSessionId() Example <% out.println(request.getRequestedSessionId()); %> -
JSP Response. Setheader() method: set header information
setHeader(String name,value) Example <% out.println(new Date()); response.setHeader("Refresh","1"); %> …… -
JSP Page. GetClass () method: get the page object
getClass() Example <% out.println("当前JSP页面的类是:"+page.getClass()); %> -
Java Connection. Createstatement () method: create a statement object
Grammar 1 createStatement() Example Connection conn = …… //省略部分代码 Statement st = conn.createStatement(); Gram…… -
JSP Request. Isrequestedsessionidfromcookie() method: judge whether the session ID is obtained from the cookie
isRequestedSessionIdFromCookie() Example <% out.println("from cookie"+request.isRequestedSessionIdFromCookie()…… -
Priority and execution order of Java threads
Priority overview public final void setPriority(int newPriority); public final int getPriority(); Use priority Exa…… -
Java Statement. Addbath() method: add batch statement
addBatch(String sql) Typical application public void bathInsert(){ Connection conn=getCon(); //省略部分代码 …… -
JSP application. Log() method: write information to the log file of the servlet
Syntax 1: log(String msg) Example <% application.log("specified message"); %> Grammar 2 log(String message…… -
Java format() method: format string
Grammar 1 format(String format,Object……args) Example String str = String.format("%d",400/2); String str2 = String.f…… -
JSP application. Removeattribute() method: removes the specified attribute
removeAttribute(String name) Example <% application.setAttribute("user","lzw"); application.removeAttribute…… -
Java character set encoding
1. General This paper mainly includes the following aspects: basic coding knowledge, Java, system software, URL, tool …… -
JSP from shallow to deep (7) — JSP directives
In the previous tutorial, we have used java util. Date。 Some people will ask: why not just use import Java util.* And…… -
Note: Lecture 8 Java network programming
Think before class 1 What is TCP / IP protocol? 2. What are the two transmission protocols of TCP / IP and what ar…… -
Feel the characteristics of Java data object JDO 2.0 query language (3)
The query feature extended by manufacturers JDO manufacturers can provide jdoql with a variety of special query functi…… -
JSP from simple to deep (12) — form editing
For example, the flag library from the blazix server cannot be used in your system environment, so what about not usin…… -
Several problems easily confused by java beginners
1. String class and StringBuffer class are both classes that handle strings, but they have one biggest difference,…… -
JSP from simple to deep (6) — JSP declaration
Now the JSP you write will become a class definition. All the scriptlets you write should be placed in a method of thi…… -
Establishment of Tomcat environment
Tomcat is another excellent JSP server developed on the basis of sun's jswdk. It not only supports servlet, but also p…… -
JSP from shallow to deep (9) — JSP sessions
On a classic website, visitors can browse several web pages and perform some interactive behavior. If you are writing …… -
Note: Lecture 7 swing user interface design
[thinking before class] 1. What is swing? What are its advantages over AWT? What are the differences in use? 2. What a…… -
JSP from shallow to deep (11) — tag library
JSP 1.1 proposes a method of extending JSP flag, which is named "flag library". These libraries allow additional flags…… -
Feel the characteristics of Java data object JDO 2.0 query language (1)
The improvement of query language is jdo2 0 specification. This paper expounds jdo2 from a higher level Some new featu……