The following code prevents classes from serialization: public class MyClass implements Serializable{//you can write your code hereprivate void writeObject(ObjectOutputStream out) throws IOException{ throw new NotSerializableException();}private Object readObject(ObjectInputStream in) throws IOException,ClassNotFoundException{

The amount of time it takes to retrieve data blocks is proportionate to the number of extents in the table. Ideally, a table should have one to three extents. Run

The class JFileChooser inside javax.swing.* can be customized to display your own labels using the UIManager.put() method. It is a static method that takes an Object key (Original value) and

To eliminate duplicate values in a collection, Java provides it own API. HashSet (java.util.*) is the class which implements Set interface. import java.util.*;class Duplicate{ static void main(String[]arr){ HashSet set=new HashSet();

This tip clarifies the meaning of

You may find that you want to know something about the form that contains the control you wish to use. You could do this by passing a reference to the

Visual Basic lacks the ability to make a file smaller without having to recreate it. But it is possible to use the SetEndOfFile API. Here is a function for it:

The following recursive function allows users to do an expand all via apopup menu: Public Sub ExpandAll(ByVal aNode As Node) Dim l_Counter As Long Dim l_Children As Long Dim temp_Node

One easy way to implement a generic name property of a class is to make a property procedure with TypeName function. Public Property Get Name() As String Name = TypeName(Me)End

My benchmarking shows that ToggleCase can crunch through a 2,000,000character string in under 4 seconds on a Pentium II. Public Function ToggleCase(ByVal strData As String) As String ‘This technique gets

The following code causes a somewhat cryptic warning message: struct Employee{ long ID; string name;};Employee emp;void func(int& id) { id=0;}// warning below issued for the following call:func(emp.ID);

To right justify the output of cout, call the width() function with the size of the output screen (in characters) as an argument. In the following example, the program calls

A header file should begin and end with #include guards to guarantee that it’s not #included more than once during the same compilation session. A typical #include guard looks as

It’s possible to use the format function to retrieve the decimal separator.Use the following statement: sTemp = Format(0,

It’s faster to enumerate a collection with the For each…Next statetment: Dim c As Class1 For Each c In Col ‘Code… NextDim fldField As ADODB.Field For Each fldField In rsTemp

In pre-standard C++, certain implementations of offered the flags ios::nocreate and ios::noreplace for controlling file creation. These flags were too platform-specific and never made it into the standard library, which

C++ defines the symbolic constants EXIT_SUCCESS and EXIT_FAILURE that you can use as return codes. These macros are defined in the header file ( in C) as follows: #define EXIT_SUCCESS

This is a common source of misunderstanding: a programmer creates a container of pointers, then fills that container with pointers to dynamically allocated objects. When the container is destroyed, the

The C++ Standard requires that the C standard library be declared in namespace std, just as the C++ Standard Library. Thus, if you #include and call printf(), you should use

You can create an array of pointers to member just as you would create arrays of any other type. The following example creates an array of pointers to member functions

You can force scanf() to read only specific characters from the input source while ignoring all the rest. Alternatively, you can force scanf() to read all input characters except the

The Standard Library defines the two template functions std::min() and std::max() in the header. In general, you should use these template functions for calculating the min and max values of

Private Declare Function ExtFloodFill Lib “GDI32” (ByVal hDC As Long, _ ByVal X As Long, ByVal Y As Long, ByVal colorCode As Long, _ ByVal fillType As Long) As LongConst

‘ make a modeless form modal” this procedure should be called by passing TRUE’ in the 2nd argument to make the form modal, and’ called again with FALSE in the

‘ get the index of the active OptionButton in an arrayFunction OptionButtonIndex(optArray As Object) As Integer Dim ctrl As Control ‘ this means not found OptionButtonIndex = -1 For Each

When you plan to create more control of the same type you can save some clicks by selecting the control on the Toolbox with the mouse while you press the

Private Declare Function OleTranslateColor Lib “OLEPRO32.DLL” (ByVal OLE_COLOR _ As Long, ByVal HPALETTE As Long, pccolorref As Long) As Long’ convert a VB color constant to a COLORREF’ accepts both

Private Declare Function GetDesktopWindow Lib “user32” () As LongPrivate Declare Function GetDC Lib “user32” (ByVal hWnd As Long) As LongPrivate Declare Function GetDeviceCaps Lib “gdi32” (ByVal hDC As Long, _

Declare Function SendMessage Lib “user32” Alias “SendMessageA” (ByVal hwnd As _ Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As LongDeclare Function GetWindowLong Lib “user32” Alias