Explanation of wrapper class

[source_acct]

Can someone explain the function of a wrapper class and maybe an
example? Thanks.

[Joanna Carter [TeamB]]

<so*********@yahoo.com> a écrit dans le message de news:
11**********************@h76g2000cwa.googlegroups. com...

| Can someone explain the function of a wrapper class and maybe an
| example? Thanks.

The Wrapper pattern is also known as the Adapter patern and this is
basically what it does; adapt one class to another purpose.

One of many useful ideas for using the Wrapper pattern is when you want to
extend a class that only has non-virtual methods :

public class NonVirtual
{
public void DoSomething()
{
...
}
}

public class VirtualAdapter
{
private NonVirtual realObject = new NonVirtual();

public virtual void DoSomething()
{
realObject.DoSomething();
}
}

Now DoSomething() can be polymorhically overridden in derived classes.

Joanna

--
Joanna Carter [TeamB]
Consultant Software Engineer

[source_acct]

Joanna, thanks for the explanation and example!
Joanna Carter [TeamB] wrote:

<so*********@yahoo.com> a écrit dans le message de news:
11**********************@h76g2000cwa.googlegroups. com...

| Can someone explain the function of a wrapper class and maybe an
| example? Thanks.

The Wrapper pattern is also known as the Adapter patern and this is
basically what it does; adapt one class to another purpose.

One of many useful ideas for using the Wrapper pattern is when you want to
extend a class that only has non-virtual methods :

public class NonVirtual
{
public void DoSomething()
{
...
}
}

public class VirtualAdapter
{
private NonVirtual realObject = new NonVirtual();

public virtual void DoSomething()
{
realObject.DoSomething();
}
}

Now DoSomething() can be polymorhically overridden in derived classes.

Joanna

--
Joanna Carter [TeamB]
Consultant Software Engineer