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programing with Java: What are constructors and instanciations and how to use them?

I'm new to java and don't understand a few things. I don't want the code (that would be cheating :)), just an explanation, examples are fine too
W'd-U-Say:

Constructors are declarations of a class that can take parameters (or not) like methods. They have no return type... they are simply ways of instantiating a class. Interfaces and abstract classes cannot be instantiated.

For example, a constructor would be made like this.
public Foo (String fooBar)
{
//code for constructor
}

Instantiations are creating instances of class variables.
For example:

String foo;

Unless you initialize this String to a value by using a line like

foo = new String("foo");

then the instantiation will be null.

Does that help? :-)

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