citrix java issues

/* * 未使用泛型面对的问题 * 1、可以添加任何类型元素 * 2、类型转换出现ClassCastException异常 * * 在集合中使用泛型，规定添加元素的类型 */ @Test public void test01() { List l = new ArrayList(); l.add(123); l.add(222); l.add("abc"); l.add(new a("lisi", 23)); l.add(333);// java.lang.ClassCastException 异常// Collections.sort(l); ListBasic Java Issues (4)

, compositionUsed to create the object person () {System.out.println ("null parameter constructor"); }//2, constructor for member variable initialization//3, the constructor can overload person (String N, int a) {this.name = n; This.age = A; System.out.println ("with parametric constructor"); } person (String N) {this.name = n; System.out.println ("name constructor"); } person (int a) {this.age = A; System.out.print

Repeated submission of the problem in the Web development is a very common problem, mainly divided into front and back-end two ways to solve, the front-end processing generally after the submission of events, the user is forbidden to click the Submit button again, waiting for the server end result and then reset the status of the Submit button.This article focuses on the problem of repeating submissions through Java back-end processing. The developmen

There is a cross-domain issue that returns a non-privileged accessThe first solutionThe other way is to add a Web referenceXMLHttpRequest WebService cross-domain issues with Java deployment requests

Before the interview was asked about how the Java to the weight of the problem, did not pay much attention to the project today just used, so record.Entity class:/*** User Class*/classuser{PrivateString username;PrivateString password; PublicUser (string Username, string password) { This. Username =username; This. Password =password; } PublicString GetUserName () {returnusername; } Public voidSetusername (String username) { This. Username =u

(); Final Condition notfull = Lock.newcondition (); Final Condition notempty = Lock.newcondition (); Final object[] items = new object[100];//Create a large container int putptr, takeptr, Count; public void put (Object x) throws Interruptedexception {Lock.lock (); try {while (count = = items.length) notfull.await (); ITEMS[PUTPTR] = x; if (++putptr = = items.length) putptr = 0; ++count; Notempty.signal (); } finally {Lock.unlock (); }} public Obj

results only out of-1, no out-2, just want to say this thing, their own time to run, did not see -1,-2, because to this situation, when it becomes 0, the other line friend come in, a judgment is not satisfied will not run.Now the results will be discussed before the security problem occurred, like this problem, we do not do the following sentence, the code runs many times no problem, but as long as the occurrence of a serious. It doesn't happen all the times, but it doesn't mean it has no secur

OutOfMemoryError exception when using BufferedinputstreamOutOfMemoryError exception when using Bufferedinputstream.In order for InputStream to be read repeatedly, we will decorate a InputStream instance with Bufferedinputstream.New Bufferedinputstream (IS); Bis.mark (integer.max_value); // While bis.read (...) Bis.resetIt's actually bufferedinputstream to save the data after Mark and restore it when reset is called, so when there's too much inputstream data, there's a problem, especially when I

1. Add filter to Web. xmlFilter>Filter-name>ContextfilterFilter-name>Filter-class>Com.cf.hr.filter.WebContextFilterFilter-class>Filter>filter-mapping>Filter-name>ContextfilterFilter-name>Url-pattern>/*Url-pattern>filter-mapping>2. Filter implementationImportjava.io.IOException;ImportJavax.servlet.Filter;ImportJavax.servlet.FilterChain;ImportJavax.servlet.FilterConfig;Importjavax.servlet.ServletException;Importjavax.servlet.ServletRequest;ImportJavax.servlet.ServletResponse;ImportJavax.servlet.ht

This article mainly introduces the use of cors to achieve Javaweb cross-domain request problem method, very good, with reference value, the need for friends can refer to the followingBefore solving cross-domain problems with JSONP, we now use cors to implement cross-domain requests to solve Java cross-domain issues:The main code is as followsPackage com.hy.fliter;Import java.io.IOException;Import Javax.servlet.Filter;Import Javax.servlet.FilterChain;I

Problem Description:write code to ask:1! +2! +3! +...+20! The valueCode1 Public classDemo {2 3 Public Static voidMain (string[] args) {4 5 6 Longnum=0;//used to Count7 for(inti=1;i//Circular Numbers8 {9 LongN=1;//Set start numberTen for(intj=1;j//factorial of each number One { An=n*J; - - } theNum=num+n;//num in which to count - } - - + System.out.println (num); - + A}Ja