What really is a wrapper object?

Hi all,
What really is a wrapper object? Can't seem to find a definition that is easily understood.
Thanks

Good Day Friend!
Let me explain you what is wrapper object
java uses primitive types such as int and char for performance reasons. these data types are not part of the object hierarchy. They are passed by value to methods and cannot be directly passed by reference. Also, there is no way for two methods to refer to the same instance of an int. At times, we need to create an object representation for one of these primitive types.For eg, there are collection of these classes, that deal only with objects; to store a primitive type in one of these classes, we need to wrap the primitive type in a class. To address this need, Java provides classes that correspond to each of the primitive types. In essence, these classes encapsulate or wrap the primitive types with in a class. Thus they are commonly referred to as type wrappers.

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Good Day Friend!
Let me explain you what is wrapper object
java uses primitive types such as int and char for performance reasons. these data types are not part of the object hierarchy. They are passed by value to methods and cannot be directly passed by reference. Also, there is no way for two methods to refer to the same instance of an int. At times, we need to create an object representation for one of these primitive types.For eg, there are collection of these classes, that deal only with objects; to store a primitive type in one of these classes, we need to wrap the primitive type in a class. To address this need, Java provides classes that correspond to each of the primitive types. In essence, these classes encapsulate or wrap the primitive types with in a class. Thus they are commonly referred to as type wrappers.

What exactly is a wrapper class?

In so far as Integer, Byte, Double et al. are concerned I understand that those wrapper classes are a way to handle primitive types as objects. But I've come across references to wrapper classes in documentation and other technical articles and I don't think I really understand what they are really used for. Why do you need a wrapper class for an object?
Could someone shed me some light on this issue?
Thanks,
John

An instance of a wrapper class holds a pointer to and instance of some other class or interface and provides access to it, typically supplying methods equivalent to all the methods of the underlying type.
The basic wrapper class a functional replacement for the underlying object.
When you're passed an object from some code outside your control you often don't know what exact class it is, or have access to it's class definition.
A wrapper object allows you to modify the functionality of such an object. You can extend the wrapper class, for example, adding extra methods. Or you can modify the methods, for example to provide logging of calls made.
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My "get me a connection" routine can return either a raw Connection or a LoggedConnection according to whether a SQL log file is provided.
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public class LoggedConnection implements Connection {
private Connection wrappee;
public LoggedConnection(Connection con) {
wrapee = con;
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return new LoggedStatement(wrappee.createStatement())
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