Container classes, like java.util.ArrayList, are general purpose object holders in the sense that they hold java.lang.Object references and not class specific references. Therefore, you can insert any object type in

Tired of typing

Reversing Array Elements in O(n/2) where n is the number of elements: Public Sub ReverseArray(arrPerson() as String)Dim iIndex As IntegerDim strTemp As String For iIndex=LBound(arrPerson) To UBound2(arrPerson) strTemp=arrPerson(iIndex)arrPerson(iIndex)=arrPerson(UBound(arrPerson)-iIndex+LBound(arrPerson)) arrPerson(UBound(arrPerson)-iIndex)=strTemp NextEnd

In VB, function Len() is mainly used to return the length of a string.However, if you pass something other than a string type variable as its argument, the result may

Whenever a handle is passed to another thread, use the DuplicateHandle API to create a duplicate handle to the same object and pass this duplicated handle to the thread. That

Using a variable when loading a control in a control array simplifies the code and makes it run faster.Example:1) Create a new standard EXE project.2) Add a Label to Form1.3)

In Windows, the computer can be set up so that many different users can log into the computer. The current user

The following code is a fast way to compose a big string by using Mid$ function instead of using the concatenating operator. The strings concatenated in a loop are often

The following method returns a (DWORD)IPAddress from a(CString)IPAddress. It is quite useful when using the CIPAddressControl. DWORD CMyClass::GetDWORDIPAddress(CString strIPAddress){ strIPAddress.MakeReverse();// Start from behind char DOT = ‘.’; DWORD dwReturnValue =

There is an explicit form of output justification. In the following example, the keywords

Define a template function as shown below: template IsEqual(const Obj & obj1, const Obj & obj2){ return !(memcmp ( &(obj1),&(obj2),sizeof (Obj)));} It will be used as follows. Obj a;Obj b;if

You can overload ‘new’ and ‘delete’ operators, just like any other operator in C++, you just need to a hidden argument. operator ‘new’ requires an argument of type ‘size_t’ (if

The following example demonstrates how to have only one instance of a class at a time. class MySingleTon{public: static MySingleTon * GetObject() { static MySingleTon obj; return &obj; } …

In a big project involving several classes, logging error messages can be required. There are several ways to do this, but a simple approach is to open the log file

A generic approach to making sure a single quote (‘) does not cause a SQL statement to fail is to replace the single quote with two single quotes, as in

The Collections class provides static APIs to generate read-only orunmodifiable collections, lists, sets, or maps from specified entities. For instance, if you are sure that the ArrayList you’ve made should

Use the java.lang.Runtime run a program in a separate process.Here

When you are typecasting and using instanceof keyword in Java, there are several things you should keep in mind. Consider the following example program: class Point { int x, y;

Following are some tips for matching the most commonly used data structures with particular needs.1. When to use a Hashtable?A hashtable, or similar data structures, are good candidates if the

By using MACRO definitions, you can easily write lines of code that are only included in Debug versions and not in Release versions. For instance, if you create a function

The java.net.HttpURLConnection class provides HTTP specific functionality. First you need to open an HttpURLConnection: URL url = new URL(

Some programmers believe that int a[] and int * a are equivalent.Also some C++ books to say that pointers and arrays are almost same. This belief usually leads to hard

For example the following code is incorrect: const char *foo(){ char buf[1024]; strcpy(buf,

If you have coded a template class and use it from VC++, you will get a LNK2001 error message on template member functions. This is because Microsoft deviates a bit

To convert character strings into its integer component: #include int ConvertString(char * str){ int result = 0; for (int index = 0; index

The need to find the Icm is pretty common in C++ programming. This is just a basic code for finding the lcm of two integers: int lcm(int large, int small){

Quite often, we find ourselves using variables to hold one of a set of possible values. For instance, let’s say you have a number of views on a grid. You’ll

This tip is extremely useful in the IDE for debugging. Before the Do loop you want to make safe, you set the var ‘loopnum’ as 0. Then, place these two

Debugging ActiveX EXE components is different from debugging ActiveX DLL components, and a bit more difficult. Here is how to do it: 1. Run your ActiveX EXE component in the

Sometimes we may need to register/unregister a DLL or OCX programatically. This piece of code can do that. Private Declare Function RegisterDLLOCX Lib _